We need to create a single HTML file index.html containing a Phaser platformer. Use phaser.min.js already present. Must use procedural graphics (Phaser graphics). Build side-scrolling, run, jump, enemies, coins, goal flag.

We need to write code. Let's create index.html with html, style, script. Use Phaser 3 (global Phaser). We'll generate graphics via this.add.graphics, fillRect, etc. Use tilemap? Simpler: create platforms as rectangles, generate level procedurally.

We'll create a scene with preload (nothing), create: physics world, player sprite using graphics (create a texture from graphics). Phaser can generate texture from graphics using generateTexture. We'll create player graphics, enemy graphics, coin graphics, flag graphics.

Implement controls: cursors.

Scrolling camera follow player.

Platforms: generate array of platform data (x, y, width). Use static physics bodies.

Enemies: simple moving left-right on platform.

Coins: static, collect.

Goal flag at end.

Implement collisions: player vs platforms, player vs enemies (stomp kills enemy, else hurt), player vs coins (collect), player vs flag (win).

Score display.

Procedural graphics: Use this.add.graphics to draw shapes then generateTexture('player', width, height). Then destroy graphics.

Let's craft code.

Need to keep file single.

We'll write index.html.

Check phaser.min.js is present; include <script src="phaser.min.js"></script>.

We'll write script inside.

Make sure to set config: type Phaser.AUTO, width 800, height 600, physics arcade, scene: { preload, create, update }.

Implement.

Let's draft.

We have written index.html. Need to ensure phaser.min.js exists in workspace. It says pre-provided; assume present. Should be playable. Provide final answer.