This code creates a side-scroller where you control Mario (a colored rectangle with a hat), jump on platforms, collect coins, and avoid enemies. It includes gravity, collision detection, and scrolling.

for Java (J2ME) existed—often a fan-made port or a "homebrew" miracle compressed into a tiny .jar file.

goombas = new ArrayList<>(); goombas.add(new Goomba(100, GROUND_Y - 15, 15, 15)); goombas.add(new Goomba(180, 250 - 15, 15, 15)); // Collect coins Iterator<Coin> it = coins.iterator(); while (it.hasNext()) Coin c = it.next(); if (marioX < c.x + c.size && marioX + MARIO_WIDTH > c.x && marioY < c.y + c.size && marioY + MARIO_HEIGHT > c.y) it.remove(); score += 10; // Horizontal collision & camera if (marioX < 20) marioX = 20; if (marioX > WORLD_WIDTH - 20) marioX = WORLD_WIDTH - 20; cameraX = marioX - SCREEN_W / 2; if (cameraX < 0) cameraX = 0; if (cameraX > WORLD_WIDTH - SCREEN_W) cameraX = WORLD_WIDTH - SCREEN_W;

Typically mapped to phone keypads (e.g., arrows for movement, keys like '2' or '5' for jumping and running). Game State Management: