I'm planning a single-file platformer with tile-based levels, player physics, and various interactive elements like enemies, hazards, and collectibles. I'll use a 16-pixel tile size scaled up 3x, with a scrolling camera to show a 40x12 tile level, and I'm mapping out the tile types: empty space, bricks, stone blocks, fire and water hazards, doors, trophies, and pip enemies.

Writing the game code... Finishing the water row, then checking the level layout. The door at row 10 needs solid floor beneath it, which the hash marks at row 11 provide. The trophy sits on a platform in the upper right, and water forms a hazard puddle on the ground rather than in a pit. Now I'm tuning the physics—with gravity at 0.35 and jump velocity at -5.6, the player can reach about 2.8 tiles high and travel roughly 3 tiles horizontally during flight, which should create a navigable path through the obstacles.

I need to keep the level forgiving by spacing platforms no more than 3 tiles apart vertically and horizontally. The bottom row stays solid so the player can always walk right, but hazards like the 5-wide water stretch are too far to jump over—I'll shrink it to 3 tiles wide and add a stepping platform above to make it passable.

For the full game, I'll hand-design 3 levels with similar structure but increasing hazard density, making sure ground hazards stay within the 3-tile width limit. I'm adding death conditions: falling into water or fire kills the player, as does touching an enemy. Enemies come in two types—walkers that patrol and reverse at platform edges, and flyers that bob up and down with sine wave motion. The trophy acts as a gate: the door stays locked until collected, then unlocks. For visuals, I'm drawing bricks with mortar lines and texture, stone platforms as gray blocks with highlights, and animating fire and water effects frame-by-frame.

The player is a simple pixel character with directional facing and walking animation for the legs. Enemies are a red blob with eyes for walkers and a spinning spiked ball for flyers. The trophy is a golden cup with a glimmer effect, gems pulse like diamonds, and the door has a purple arch that glows when unlocked. I'm layering a dark starfield with a parallax brick pattern as the background.

Controls are arrow keys or WASD for movement, space to jump, R to restart, and Enter to start. The HUD shows score, lives, level number, and a trophy indicator. For rendering, I'm using a fixed internal resolution scaled up to fill the canvas—setting the canvas to 960×672 and scaling by 3 to keep pixels crisp. The camera follows the player horizontally and clamps to level bounds. Collision detection uses axis-aligned bounding boxes against tiles. Death handling is next.

Writing the game code now. Writing the game code...