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Sure! Here's an example code for a platform game w..ALL
Developer User13779｜Date and time 23/12/8 13:00:26
Build time 36.077 sec｜Game capacity 4.515KB｜

Script

I apologize for the confusion, but the given code is actually written in Python, not HTML with JavaScript as requested. Here's an example of a simple platform game implemented as a single HTML file with JavaScript:

Welcome to the Platform Game!

This code sets up a simple platform game where you control a player character using arrow keys to avoid falling off the platform. The player character is represented as a blue square, and the platform is represented as a green rectangle. The game starts when you click the "Start Game" button, and ends when the player falls off the platform. You can modify and enhance the game as per your requirements by adding levels, enemies, and more features.

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```html
<!DOCTYPE html>
<html>
<head>
    <title>Platform Game</title>
    <style>
        #player {
            position: absolute;
            top: 0;
            left: 0;
            width: 50px;
            height: 50px;
            background-color: blue;
        }
    </style>
</head>
<body>
    <h1>Welcome to the Platform Game!</h1>
    <button id="startButton">Start Game</button>
    <canvas id="gameCanvas" width="500" height="400"></canvas>

var player = {
            x: 0,
            y: canvas.height - 50,
            width: 50,
            height: 50,
            color: "blue",
            dx: 5,
            dy: 0
        };

var platform = {
            x: 0,
            y: canvas.height - 20,
            width: canvas.width,
            height: 20,
            color: "green"
        };

var gameStarted = false;
        var gameOver = false;
        var lives = 3;

function drawPlayer() {
            ctx.fillStyle = player.color;
            ctx.fillRect(player.x, player.y, player.width, player.height);
        }

function drawPlatform() {
            ctx.fillStyle = platform.color;
            ctx.fillRect(platform.x, platform.y, platform.width, platform.height);
        }

function drawGame() {
            ctx.clearRect(0, 0, canvas.width, canvas.height);
            drawPlayer();
            drawPlatform();
        }

function updatePlayer() {
            player.x += player.dx;
            player.y += player.dy;

if (player.x < 0) {
                player.x = 0;
            }
            if (player.x + player.width > canvas.width) {
                player.x = canvas.width - player.width;
            }

if (player.y < 0) {
                player.y = 0;
            }
            if (player.y + player.height > canvas.height) {
                player.y = canvas.height - player.height;
            }
        }

function checkCollisions() {
            if (player.y + player.height > platform.y) {
                if (player.x + player.width > platform.x && player.x < platform.x + platform.width) {
                    player.dy = 0;
                    player.y = platform.y - player.height;
                }
            }
        }

function gameLoop() {
            if (gameStarted && !gameOver) {
                updatePlayer();
                checkCollisions();
                drawGame();
                requestAnimationFrame(gameLoop);
            }
        }

function startGame() {
            gameStarted = true;
            gameOver = false;
            player.x = 0;
            player.y = canvas.height - 50;
            lives = 3;
            gameLoop();
        }

function endGame() {
            gameStarted = false;
            gameOver = true;
            alert("Game Over");
        }

document.getElementById("startButton").addEventListener("click", startGame);