The game takes place on a simple, two-dimensional playfield. Players control a blue square that can slide left or right along a panoramic perspective, gradually disappearing from the left side of the screen as it is periodically reset.
The objective is to guide a new square, spawning on the right side of the screen, and merge it with the existing blue shape by making it come into contact. Small obstacles and other squares often move in the opposite direction and can cause players to lose their glowing blue square, resulting in a game over. It runs in the browser and requires no download or registration, allowing players to play as soon as they launch the game.