In Reshape you rotate a square in the centre of the screen to line up with approaching triangles so they can connect neatly with each of the square's flat edges. If you collide with a moving triangle as you are rotating your shape, any connected triangles are lost and you revert to a plain square. If you collide with another triangle in this state, you lose. Each time you manage to connect with four triangles and form a larger square, it shrinks back to the standard size. The goal is to go on as long as possible before being defeated by the increasing pace of the game.