Doodle Jump is a 2D platformer with a doodle sprite that jumps on platforms. The sprite’s x-position is controlled by the device’s accelerometer and its y-velocity is determined by the platform’s type and height. The sprite can fire bullets by detecting the screen’s touch event. The game has various power-up, theme, mode, score, achievement, and leaderboard classes. The game loops until the sprite collides with an obstacle or enemy object. The game uses physics, graphics, sound, and input APIs.