Many players are familiar with a puzzle where shapes fall from the sky and categories must be cleared by matching the falling pieces with vacant spaces on the bottom of the screen. A rapid speed and a distinct time-limited clock apply, creating pressure to act quickly. The longer the game progresses, the more quickly the shapes drop, increasing the challenge.
Players match falling items based on specified rules with shapes bearing icons representing several types: stripes, cycles, squares, and right angles. The rules determine which shapes can occupy adjacent slots. The match with more items increases the score but drops new elements to prevent short-term order from remaining unbroken for too long.