Wolfenstein raycaster · deepseek-v4.1-flash

Let me build a raycasting maze shooter. I'll write the full index.html then test in the browser.

Let me design:

- Canvas full screen-ish, maybe 960x600.
- Raycaster with procedural textures.
- Map grid, e.g. 16x16.
- Player with health 100.
- Enemies: sprite-based, with health, move toward player, attack when in line of sight and close.
- Space shoots: raycast against enemies (only visible ones occluded check).
- Exit tile locked until all enemies dead.
- HUD: controls, health, enemies remaining.
- Restart button.

Let me write carefully.

Raycasting DDA algorithm. Textures generated into arrays of pixel data (e.g., 64x64), stored as ImageData or Uint32Array.

I'll create canvas with putImageData for the 3D view, then draw sprites with manual depth handling.

Approach: render walls to an ImageData buffer at fixed internal resolution (e.g., 480x300), then scale up to canvas via drawImage. That's classic. Then draw sprites onto the same buffer with z-buffer.

Actually easier: use a separate offscreen canvas with ImageData at internal resolution, putImageData, then drawImage scaled. Sprites drawn as part of buffer with per-column depth test.

Let me do that.

Texture generation: 64x64 each. Wall types: brick, stone, tech, exit door (green). Enemy sprite: procedurally draw a simple monster figure with transparency (alpha 0 for background). Generate sprite as canvas via 2d drawing then getImageData.

Let me plan sprite: 64x64 drawing with arms, eyes, etc. Use a simple demon.

Raycaster DDA standard (Lodev). Use map as 2D int array.

Collision: player radius, check map cells.

Enemy AI: move toward player if line of sight, attack if within range and cooldown. Enemies can also wander. Attack rule: clear line of sight and distance < 1.5 tiles, every 1.2s damage 8.

Shooting: on space, cast a ray in facing direction; find nearest enemy whose angular/perp distance aligns and is within range and line of sight not blocked by wall and no other enemy closer. Simple: for each alive enemy compute relative position, angle difference < threshold, distance < range, and clear line (raycast to enemy). Pick closest.

Screen shake / weapon flash feedback: draw a gun at bottom, muzzle flash.

Let me handle pointer lock optional mouse turning — can add but not required. I'll add basic mouse move turning without pointer lock maybe. Keep simple: add pointer lock on click optional. I'll include it lightly.

Let me write code.

Internal resolution: W=480, H=300 (canvas displayed scaled to fit). Actually let's use canvas 640x400 CSS scaled. Let me just set canvas.width=960, canvas.height=600 and render at half maybe. Simpler: render buffer at 480x300, canvas at 960x600.

Let me write.

Map 24x24 maybe. Let me create a small maze with rooms.

I'll define map as strings.

Let's make a 20x20 map.

```
const MAP_STR = [
"11111111111111111111",
"1..................1",
"1..2222....3333....1",
"1..2.......3.......1",
"1..2.......3.......1",
"1..................1",
"1.........2........1",
"1....E....2....D...1",
"1.........2........1",
"1..................1",
"1...3333....2222...1",
"1...3..........2...1",
"1...3..........2...1",
"1..................1",
"1..................1",
"1........E.........1",
"1..................1",
"1..................1",
"1..................1",
"11111111111111111111"
];
```

Where 1=brick, 2=stone, 3=metal, D=exit door, E empty with enemy spawn, . empty.

Need exit reachable. Place D at an edge. Enemies at E positions.

Let me count enemies: place 3+.

Actually let me design carefully with coordinates as grid (x=col, y=row).

I'll just write map with '.' and digits and then parse; enemy spawns separate list, exit separate.

Let me define:

```
const MAP = [
"11111111111111111111",
"1..................1",
"1..2222....3333....1",
"1..2..........3....1",
"1..2..........3....1",
"1..................1",
"1.......22.........1",
"1.......22.........1",
"1..................1",
"1...3333.....2222..1",
"1...3............2.1",
"1...3............2.1",
"1..................1",
"1..................1",
"1....222.....333...1",
"1..................1",
"1..................1",
"1..................1",
"1..................1",
"11111111111111111111"
];
```

Hmm the .2.1 pattern at row 10/11 creates a little nook. Fine.

Exit: place at a wall location? Exit as a special tile 'X' that when reached ends game. Let's put X at map[17][17] maybe as floor tile special. Easier: exit as a floor cell marked. But then wall rendering not needed. I'll make exit a visible glowing pad on the floor. Simpler: render exit as a special wall tile? Reaching it means walking adjacent. Hmm "reachable exit" — a floor pad is good.

Let me put exit pad at row 17, col 17. Player starts at (2.5, 2.5) or (3.5,1.5). Keep start in open area.

Enemies at e.g. (16.5, 3.5), (10.5, 11.5), (5.5, 15.5), (16.5,17.5). 4 enemies.

Now let me write the code fully.

Key handling: prevent default for arrows/space.

Game loop with requestAnimationFrame, delta time.

Movement speed 3 tiles/s, turn speed 2.5 rad/s.

Player radius 0.25.

Collision: attempt move x then y separately checking map cells.

isWall(x,y): map cell >0.

For enemies move similar, with radius.

Sprites rendering: for each enemy and exit pad and maybe items. Sort by distance descending. Transform with inverse camera matrix. Standard.

I need zBuffer from wall casting per column.

Let me write raycaster:

For x in 0..W-1:
 cameraX = 2*x/W - 1
 rayDir = dir + plane*cameraX
 DDA...
 perpWallDist, side, wallX, texX.
 lineHeight = H / perpWallDist
 drawStart = -lineHeight/2 + H/2, etc.
 texture y stepping.

Textures stored as Uint32Array of size texW*texH*? Actually Uint8ClampedArray RGBA. I'll create via canvas.

I'll use Uint32Array view for speed. Let's store texture as Uint32Array(64*64), in ABGR? With ImageData using Uint32Array on little-endian, color = (a<<24)|(b<<16)|(g<<8)|r. I'll write helper.

For shading, apply side darkening and distance fog by multiplying rgb. Doing per-pixel multiply from Uint32 is okay.

Let me just store textures as Uint8ClampedArray and read r,g,b.

Texture generation function returns {w,h,data:Uint32Array}. Build with offscreen canvas and getImageData, then convert to Uint32 view.

Sprites: store as Uint32Array with alpha. For drawing check alpha channel.

Let me code drawImage for sprite columns with zBuffer test.

Sprite drawing standard Lodev:

spriteX = ex - posX; spriteY = ey - posY;
invDet = 1/(planeX*dirY - dirX*planeY);
transformX = invDet*(dirY*spriteX - dirX*spriteY);
transformY = invDet*(-planeY*spriteX + planeX*spriteY);
spriteScreenX = (W/2)*(1+transformX/transformY);
spriteHeight = abs(H/transformY) * scale;
drawStartY = -spriteHeight/2 + H/2 + vMoveScreen
...
spriteWidth similarly.
For stripe, texX, if transformY>0 and stripe in range and transformY < zBuffer[stripe], draw.

I'll use scale ~1.0 for enemies.

Enemy sprite 64x64, maybe with feet. Vertical offset so it sits on ground: vMove maybe 0.

Exit pad: render as a flat sprite? Simpler to give it a sprite that's short near ground. I'll just render a glowing column/portal sprite.

Now gun rendering: draw on canvas after scaling, using shapes. Or draw in buffer. I'll draw on main canvas with 2d after drawImage. Weapon: a rectangle gun at bottom center, muzzle flash when shooting.

HUD: HTML overlay divs for controls, health bar, enemy count, messages.

Crosshair.

Let me now write the file.

Shot logic:
```
function shoot(){
 if(shootCooldown>0) return;
 shootCooldown=0.35; muzzle=0.08;
 // find target
 let best=null,bestDist=Infinity;
 for enemy alive:
   dx=e.x-posX, dy=e.y-posY;
   dist=hypot;
   if dist>12 continue;
   angle to enemy vs dir; use dot product with dir; need within ~0.15 rad → use cross/dot: 
   forward = dx*dirX+dy*dirY; if forward<=0 continue;
   perp = abs(dx*planeX+dy*planeY)? Actually use camera plane projection. Simplest: angle = atan2(dy,dx)-atan2(dirY,dirX) normalized; if abs<0.12.
   line of sight check via raycast.
   if dist<bestDist -> best
 hit: enemy.hp -= 34; if <=0 kill, enemiesRemaining--
}
```
LOS check: step along ray from player to enemy in small increments, if wall hits before enemy then blocked. Use function losClear(x0,y0,x1,y1) returning true if no wall.

Need shots cannot damage through wall → losClear handles.

Enemy attack: if losClear and dist<2.0, cooldown, damage player. Only when enemy alive and game active.

Also enemy should be "visible" i.e., rendered. Enemies move toward player slowly when LOS clear, else wander/patrol.

Damage feedback: red flash overlay.

Game states: playing, dead, won.

Restart resets.

Let me write.

For textures, I'll write a helper makeTexture(drawFn) that creates canvas 64x64, draws, returns ImageData and Uint32.

Wall textures: 
- brick: red/brown bricks with mortar.
- stone: gray bricks.
- metal: bluish with rivets.
- exit? not a wall.

Let me include 3 textures indexed 1..3.

Floor/ceiling: solid gradient or simple shading. I'll do simple gradient fill per row (floor darker at bottom, ceiling at top). Just fill buffer rows. Actually classic: draw ceiling/floor as gradient.

Let me set ceiling color dark gray-blue, floor dark brown, with gradient. Simple per-row fill.

Now implement buffer as ImageData(W,H), buf32 = new Uint32Array(imageData.data.buffer).

Colors: pack(r,g,b) => (255<<24)|(b<<16)|(g<<8)|r.

Let me write render ceiling/floor:
for y in 0..H: if y < H/2 color ceiling gradient else floor gradient. fill row.

Now DDA.

Let me code it.

deltaTime, clamp.

Let me write the entire HTML now.

Need to make sure no external resources.

Let me write.

Canvas sizing: I'll make canvas fill window while maintaining aspect? Simpler: canvas element width/height attributes = 960x600 (render buffer 480x300 scaled). Use CSS to scale to fit viewport keeping aspect.

Actually to make it responsive, set canvas CSS width/height via JS on resize to fit window preserving 16:10. Fine.

Let me set internal buffer W=480,H=300, canvas.width=480,canvas.height=300 and scale via CSS. That's cleanest: draw buffer then drawImage to same canvas? If canvas is 480x300 we can putImageData directly then draw sprites/gun on top with 2d. Wait putImageData replaces; then we can drawImage the offscreen buffer... Let's use two canvases layered or just one: use putImageData to canvas ctx at 480x300, then draw sprites onto same ctx using drawImage of sprite canvases? But sprites need z-buffer column tests and scaling — easier to draw into the ImageData buffer directly.

Plan: render everything (walls, floor, sprites) into buf32 ImageData at 480x300. Then ctx.putImageData(imgData,0,0). Then draw weapon and crosshair on top with vector drawing on the same canvas (480x300 coordinate space). HUD in HTML overlay.

Canvas CSS scales up. Good. Weapon drawn small but scales fine.

Sprites drawn into buffer: need sprite data as Uint32 with alpha. I'll generate sprite ImageData on 64x64 canvas, then get Uint32Array.

Let me write drawSprite with alpha check: pixel = data[ty*sw+tx]; alpha = pixel>>>24; if alpha>128 then set.

For shading sprites by distance, darken.

OK writing.

Potential endianness issue: Uint32Array over ImageData buffer uses native endianness; on little-endian, value = a<<24|b<<16|g<<8|r. Browser test environment likely little-endian. I'll just use this and it's fine.

Let me write generateTexture using canvas getImageData then read via Uint32Array. Same endianness so consistent.

Now code.

I'll write carefully and completely.

Let me define enemy sprite drawing: 64x64.
- transparent background
- body: dark red torso, head, glowing yellow eyes, arms, legs.
- maybe varying color per enemy? Just one.

Exit pad sprite: 64x64 draw a glowing green ring/portal.

Let me draw.

Also maybe draw a "locked exit" red vs unlocked green. I'll change exit sprite based on unlocked. Generate two sprites.

Now let's write.

For enemy movement, avoid walking through walls; simple: compute step toward player, test x/y separately.

Enemy also should not overlap player too much.

Let me write the code.

Also need "remaining enemy count" display.

Damage rule shown in HUD: "Enemies melee at close range with line of sight."

Let me code now.

I'll be generous but concise.

One more: gun shooting should show recoil/flash. muzzle timer.

Let's produce file.

For fonts, use monospace system font.

Write.

Let me think about the exit: place at a location and draw a floor pad. When player within 0.5 tile of exit center AND all enemies dead → win. If not unlocked and player reaches it, show message "Exit locked".

I'll render exit as a sprite so it's occluded by walls too.

Exit position (17.5,17.5) but map has wall at edges; (17,17) is floor? row 17 = "1..................1" so col 1..18 floor. col17 floor yes. But row 17 is index 17. Fine. Actually I need to double check rows count 20. Row indices 0..19.

Player start (1.5,1.5)? Let's do (2.5,2.5)? Row2 = "1..2222....3333....1" col2 = '.', good. Player at (2.5,2.5).

Enemies: (16.5,1.5)? row1 all floor. (10.5,6.5) row6 "1.......22........." col10 = '.'? Let me index: row6 = "1.......22.........1" positions: 0'1',1-7 '.', 8'2',9'2',10-18 '.',19'1'. col10 '.', good.
(5.5,13.5) row13 "1..................1" good.
(16.5,15.5) row15 all floor good.

4 enemies.

Exit at (17.5,17.5).

Check map row 17 col 17 floor yes.

Now write.

I'll implement LOS by ray marching with step 0.05.

Let me write the final file.

Also collision near start: wall at row0 col? Player at (2.5,2.5), nearby walls at row2 col3-6 (the "2222"). So moving down (+y) from start hits wall at row2? Player y=2.5 moving toward y decreasing? Let's just trust.

Let me write code.

I'll now produce the HTML.

Need to handle keydown/keyup with e.code.

Also mouse optional: pointer lock on click of canvas, mousemove changes dir. I'll add but keep keyboard primary.

Let me write.

For performance, use fixed modest internal res.

Now writing file content.

Let me be careful with the sprite transform math and the cube.

Code:

```
const dirX = Math.cos(angle), dirY = Math.sin(angle);
const planeX = -dirY*fovScale, planeY = dirX*fovScale; // fov ~ 0.66
```
Wait standard: camera plane perpendicular to dir. plane = (-dirY, dirX)*tan(fov/2). fov 66deg → tan(33)=0.649. Good. As angle increases, dir rotates clockwise? atan2(dy,dx). Turning right should increase angle. With screen x from left to right cameraX from -1 to 1, rayDir = dir + plane*cameraX. plane = perpendicular. Choose planeX = -dirY*0.66, planeY = dirX*0.66. At angle 0, dir=(1,0), plane=(0,0.66). rayDir for cameraX=1 → (1, 0.66) pointing to +y (down on map). In our map, +y is downward on screen. Left/right consistency: turning right (angle+) rotates dir from (1,0) to (cos,sin) → +y downward. On a top-down map with y down, that's clockwise = turning right. Good.

Now DDA standard.

Sprites: invDet = 1/(planeX*dirY - dirX*planeY). transformX = invDet*(dirY*sx - dirX*sy). transformY = invDet*(-planeY*sx + planeX*sy). Should be positive when in front.

Let me just code.

Now writing file.

I'll write it all.

For enemy sprite vertical placement: spriteHeight = |H/transformY|. drawStartY = H/2 - spriteHeight/2 + vMove. With vMove 0, sprite centered vertically, occupying full height when close — good enough for enemies (they're 1 tile tall). To make them stand on floor, could add vMove = some. Keep centered.

Actually enemies ~1.7 tiles tall maybe. Use scale factor. Keep 1.0.

Exit pad: I'll make sprite 64x64 with the pad drawn in lower portion so it appears on the floor. Add vMove positive to push down. Let's handle per-sprite vDiv/vMove. Keep simple: exit sprite drawn as a portal column, no vMove.

Fine.

Now write.

Let me also add minimap? Optional, nice but not required. Skip to save time, maybe small minimap top-right. Could help verification. I'll add a small minimap drawn on canvas overlay. Might be nice. Keep it small. Actually adds complexity; I'll add simple HTML canvas? Let me just skip minimap, or draw as HUD. I'll skip.

Let me write now for real.

Now writing the complete file.

HUD overlay: position absolute, controls list, health bar, enemies count, message center.

Let me write CSS.

Let me produce.

sfx: no audio requirement. Could add WebAudio beep but skip.

Writing.

One thing: shots need to hit enemies. I'll verify with console logs maybe.

Let me include a small debug global exposing game state for testing: window.__game = {...}. Might help browser checks. Fine.

Now write.

Let me write the file.

Now let's load it in the browser and inspect.

The scene renders. But wait, the starting view looks weird — the player is at (2.5,2.5) facing angle 0 (east). Should see corridor. But the screenshot shows what looks like a wall very close? Actually it shows brick/stone walls at varying distances. There's a dark vertical strip in center — that's probably a distant corridor. Looks plausible.

Hmm, actually the view shows large wall faces on left and right and center. It might be that the player is inside a small area. Let me think: at (2.5,2.5) facing east. To the east: row2 has walls at col3,4,5,6 (the "2222"). Player at x=2.5, so wall at col3 immediately ahead at distance 0.5. That's why there's a big wall right in front. So the start viewpoint is staring at a wall 0.5 units away. That's not great for a shooter start. Let me move start to an open area with a longer view.

Looking at map, starting position should have some open space. Let me put start at (1.5, 1.5) facing east? Row1 is all floor. At (1.5,1.5) facing east, corridor along row1 open to x=18. Good long view. But nearby wall at row0/row2. Let me set START = {x:1.5,y:1.5,a:0}.

Actually there's a wall at row2 col3.. and row 2 col... at y=1.5 the player is in row1, open. Long corridor east. Good.

But then enemy at (16.5,1.5) is far down the corridor and will approach. Good.

Let me also check for a "nearby wall" for collision test. Row0 is wall, player at y=1.5. Fine.

Let me change start. Also the initial screenshot after that.

Also I notice the enemies aren't visible in the current view (they're far). Let's test after moving.

Also the map: player at (1.5,1.5), the corridor row1 goes east. Let me verify row1 = "1..................1" yes open.

Let me update START and also maybe increase texture brightness? It looks fine.

Let me change start.

Now reload and test. I'll use __game debug. Let me reload and screenshot.

Now the view is a good corridor with brick on left, textured stone on right, and an enemy visible at the end. Great.

Now let me test movement, collision, shooting. I'll use the debug handle via browser? The browser tool doesn't have an evaluate action. I can only click/type/key/scroll. Hmm. The tool actions: reload, inspect, screenshot, motion, click, drag, key, type, scroll. No JS eval. So I need to test via keyboard input.

Let me use key action to press keys. The key action probably takes text like "w" and does keydown/keyup. Let me test movement by holding? The key action may just send a keypress. I can also dispatch via type. Let me try pressing ArrowRight and W and observe via inspect (DOM shows HUD but not position).

Better: I can add an on-screen debug readout of player x,y,angle to the HUD so I can verify via inspect. That's useful and also not harmful. Let me add a small debug line in stats (could hide). Actually adding a live position readout is fine and helps verification. Let me add it to the stats panel subtly.

Let me add "POS" line updated each frame.

Actually updateHUD only called on changes. I'll update position in render or update each frame. Let me add to updateHUD and call it periodically... simpler: in render, set textContent. Let me add element and update in loop.

Let me add to stats panel: `<div><span class="lbl">POS</span> <span id="posread">0,0</span></div>`. Then in loop update.

Let me do it.

Actually, an easier verification: use browser key actions and screenshots to see movement. But collision precise check benefits from numbers. Let me add the readout.

Then use the "key" action. Let me figure out its semantics — it likely accepts text like "w". Let me just try.

Add readout first.

Now reload and test movement. Let me use browser key. I'll try to hold W. The key action likely sends a single keydown + keyup. To move a meaningful distance I might need repeated presses. But keydown then keyup in same frame yields tiny movement. Hmm.

Maybe the key action holds for a bit? Unknown. Let's test with ArrowRight and see if angle changes in DOM. Then W.

Let me reload and inspect first.

Now let me test turning. Use key action. Let me try `key` with text "ArrowRight".

The angle stayed a0.00, but interesting: the enemy got closer and is now visibly detailed — meaning time passed and the enemy moved toward the player. The key action apparently does a quick keydown/keyup, too short to register meaningful turn (0.00). But wait, the enemy moved a lot between frames — the reload frame was at enemy far, now it's near. That's just time passing.

The angle reads 0.00 but maybe it changed by tiny amount and modulo display rounds. Turn speed 2.4 rad/s; a single frame at 60fps = 16ms → 0.038 rad, shown as 0.04. It shows 0.00, so key wasn't registered or was released same frame.

Hmm. Also I notice the enemy came very close and is right in front. Good — enemies approach. And it will attack.

I need a way to hold keys. The `key` tool may support a repeat? Maybe the key action takes text and holds for some duration automatically? Apparently not.

Alternative: I can use `type` which types text — also not helpful for holding.

Maybe I can verify by programming: I could add a self-test that runs via setTimeout and logs to console, then read console. Actually console output is captured. I can write automated tests into the page temporarily (or permanently harmless) that run a sequence and console.log results. Then reload and read the console output. That's a great approach!

Let me add a query-param or a flag. Simpler: I'll add a self-test block that runs only if location.hash === '#test'. Then load with #test... but browser reload always loads index.html without hash? The reload action likely loads the base file. Hmm.

Alternative: I can create a separate test html? But instructions say single file. I could temporarily add test code, run, then remove.

Let me add temporary test code at the end that runs after 1 second, simulating keys for a duration by directly manipulating the `keys` object over time and logging results, then I'll read the console via inspect/reload. Actually the test can run automatically on load with setTimeout; I'll read console after a few seconds.

But the browser tool captures console on the action. Let me add the test, reload, then take screenshot/inspect after enough time. The inspect reports console array. Good.

Let me write a test harness that:
1. records start position
2. holds W for 0.5s (via keys['KeyW']=true, then false) — but the game loop uses real time. I'll use setTimeout.
3. After movement, log position.
4. Test collision: set player near a wall and hold W into it, check position doesn't pass.
5. Test turning: hold ArrowRight, check angle changed.
6. Test shooting: aim at enemy with LOS, shoot, check enemy hp/alive.
7. Test wall occlusion: place enemy behind wall relative to player with no LOS, shoot, check no damage.
8. Test restart.
9. Log PASS/FAIL.

I'll write results into a global array and also console.log. Then read.

Let me add the test code guarded by a flag I can flip, run it, then remove. Actually I'll just add it temporarily and remove after. Let me do it.

Let me write the test script appended before </script> maybe after __game. I'll append a new script block at end of body that uses window.__game.

Note __game.key sets keys[code]. Good.

Test sequence with async/await delays.

Let me insert before </body>.

I referenced window.__game.__los which doesn't exist; harmless (undefined) but check condition `e1.hp === e0.hp && !undefined` = true needed. `!undefined` is true, so fine.

Now reload and wait ~4s then inspect console. The browser tool actions each wait for frame? Let me reload then take a screenshot which will happen after some time. Actually reload returns immediately at frame 1. Then I need to wait. The self-test takes: 300+50+400+50+300+50+600+50+30+30+30+400+50+30+30+30+1500+50 ≈ 4s. Let me do a few screenshots to burn time. Actually the browser tool probably processes actions in sequence with some real time. Let me just reload, then do a couple of waits via screenshot, then inspect.

I'll reload, then screenshot (takes time), then inspect.

The screenshot still shows initial state (the self-test resets at start, and the screenshot was taken quickly). I need to wait for the test. Let me take a few more screenshots or use motion. Actually let me just take another screenshot and then inspect. The test runs in background. Let me do a couple of screenshots to pass time.

All 8 self-tests passed. The first screenshot shows the enemy up close and the red damage flash — enemy sprite looks good and is occluding correctly (sprites drawn). The second is after restart with red flash overlay still fading (hurtFlash set on reset? No, reset sets hurtFlash=0 but flashEl background retains last value since we only update flashEl when hurtFlash>0. On reset, flashEl.style.background not cleared. That's a minor bug: after restart following damage, the red flash stays until next damage. Let me fix by clearing flashEl background in resetGame.

Also note the enemy sprite rendering is quite blocky/pixelated (64x64 scaled up) but that's expected for the style.

One issue: the enemy at (5.5,5.5) test looked huge and the sprite is fine.

Let me fix the flash reset bug. In resetGame add `flashEl.style.background='rgba(255,0,0,0)';`. But resetGame is defined before flashEl declaration? resetGame references document.getElementById('overlay') directly and hideMsg which uses msgEl defined below. Actually resetGame is called at boot after all const declarations (boot at bottom), so fine. But resetGame itself is a function declaration; referencing flashEl inside is fine as long as called after flashEl initialized. Boot happens at bottom after declarations. Good.

Let me add.

Then remove the self-test harness. Actually keep or remove? Instructions: final file should be the app. The self-test is harmless but adds ~3.5s of automated manipulation on every load, which would disrupt the user (it moves the player around on startup!). Definitely must remove it. Also remove the debug POS readout? It's a bit unusual but harmless and useful. I'll remove POS readout too to keep clean? It's fine to leave, but let's keep the app clean and remove POS since it wasn't required. Actually a position readout is odd in a game HUD. I'll remove it.

Also should I remove window.__game debug handle? It's harmless and can be useful. I'll keep it but it's fine. Actually keep minimal; leave it, no harm.

Let me remove self-test and POS readout, fix flash reset.

Let me also double check the win condition path. Hard to test fully but logic is sound: kill all → exitOpen true, walk to exit → won. I verified shoot-kill works. Let me also verify exit unlock via test? I could have tested but already removed. Let me run one more quick test for win state before removing. Actually time budget ~15 min, we're fine. Let me add a quick verification: I'll modify the self-test? Simpler: trust logic but verify exit collision and win by a focused test. Let me just add a temporary extra test snippet before removing, or reason.

Potential bug: after killing all enemies, `exitOpen = true` set inside tryShoot. Then update checks distance to exit and calls showOverlay won. Seems fine.

Let me verify by adding to the self test: reset, setPlayer near exit, kill all enemies via shooting? Can't easily kill all. I can set enemies alive=false via debug? Not exposed. I could just set player at exit with exitOpen false to see "EXIT LOCKED", and then... 

I'll trust it. But let me do a quick targeted browser test by adding a temporary snippet that sets all enemies dead and teleports player to exit, then check state==='won'. Actually I'll just include it in the current self-test file (which still exists), re-run after adding. But that requires editing. Given passing tests and simple logic, I'll do a quick one.

Actually simpler: the test harness still in file. Let me add two lines to test win before removing. But then I'd reload and wait again. It's cheap. Let me do it to be thorough.

I'll edit the self-test to add win test after restart test. Wait restart test is last. Add before console.log.

Actually, I can just directly manipulate through __game: I need to kill enemies. I'll add setEnemyHp. Or expose a killAll. Let me add to __game a method. Simpler: in test, use G.setPlayer near exit then repeatedly shoot enemies from a position with LOS? Too complex.

Let me add `killAll() { enemies.forEach(e=>e.alive=false); exitOpen=true; updateHUD(); }` to debug handle and test win. But that bypasses the actual kill→unlock logic. The unlock logic I already validated via shoot-kill? No, I only checked enemy alive=false for enemy 0, but exitOpen should have become true only when left===0 (all 4). So not validated.

Let me test the full chain: place player at a spot, put all 4 enemies in a line in front at increasing x with clear LOS, shoot repeatedly, then check exitOpen. That validates kill→unlock. Then teleport to exit and wait a frame, check state.

Let me modify self-test: after restart test, do:
```
G.reset(); await wait(30);
G.setPlayer(1.5, 8.5, 0); // row8 open
// put all enemies in front along row8
G.setEnemy(0, 5.5,8.5); G.setEnemy(1,8.5,8.5); G.setEnemy(2,11.5,8.5); G.setEnemy(3,14.5,8.5);
await wait(30);
for (let i=0;i<6;i++){ G.shoot(); await wait(350); }
rec('kill-all-unlocks', G.exitOpen===true, 'exitOpen='+G.exitOpen+' alive='+G.enemies.filter(e=>e.alive).length);
// teleport to exit
G.setPlayer(17.5,17.5,0); await wait(100);
rec('reach-exit-wins', G.state==='won', 'state='+G.state);
```
But enemies move toward player during the 350ms gaps, which is fine, they stay in line-ish. Actually they'll move toward player, possibly clustering. Shooting cone tolerance is lateral < 0.42*forward. If they move off row8 they might leave the cone. Since they move straight toward player (row8 line), they stay on row8. Good. But player also might get attacked. Fine.

Shots: each does 34, enemy hp 34 → one shot kills. 6 shots for 4 enemies is enough but cooldown 0.32 so wait 350ms works. Good.

Wait, when player shoots the nearest, others remain. Cone check: enemy at 14.5, forward 13, halfWidth 5.46, lateral 0 → hit. But nearest is chosen among those in cone. After nearest dies, next shoot hits next. Fine.

But there's a wall? Row8 is "1..................1" all open. Good.

Let me add this test. Then reload/wait/inspect. Then remove all test code and POS, fix flash.

Let me do the edit.

The page is already loaded from before with the old test. I need to reload to run the new test. Let me reload and wait.

Now wait for test to finish (~2.7s + 8*0.36=2.9 + other ~4s from earlier tests ~ 8s). Let me sleep 9s then inspect.

All 10 tests pass. Now remove the self-test harness and the POS readout, and fix the flash reset bug. Then reload and take a final screenshot.

Let me remove:
1. POS readout div and posReadEl const and loop update.
2. Self-test block after window.__game.

Fix resetGame flash clear.

Let me do edits.

Now verify the file has no leftover test references. grep.

Clean. Now reload and check the final state, and test a real key interaction with keyboard (the browser key action) to make sure controls work without the harness. Since key holds too short, I can't verify movement via keyboard tool. But the self-test already verified via the same keys object that real key events populate. Real keydown handler sets keys[e.code]=true; that path was used. Actually the self-test set keys directly via G.key, not through the event handler. There's a small gap: does the keydown listener correctly set keys? It does, standard. And we did press ArrowRight earlier which showed the enemy move but angle 0.00 — inconclusive. Let me verify event wiring by a quick test: use the type/key tool then check. Actually I can't read angle anymore (removed POS). 

Let me not worry — the event handlers are straightforward. But to be safe, let me re-add a temporary check? No. The earlier ArrowRight press did cause... angle stayed 0.00 but that was before. Hmm.

Actually, I can test keyboard wiring by taking a screenshot after pressing W several times quickly and see if the view changes. The key tool might register keydown with a duration though — earlier ArrowRight didn't change angle. So can't.

The self-test used the same `keys` map the event handler writes to; the only untested link is `window.addEventListener('keydown', ...)`. That is trivial code. I'm confident.

Let me do final reload + screenshot to confirm no console errors and initial view.

Final state clean: no console errors, initial view renders correctly, HUD shows health 100, enemies 4, exit locked, controls displayed. The file ends with index.html present.

Let me confirm final file exists and briefly report.