Zoop is a real-time puzzle game, like Plotting, where the player controls a triangle in the center of the screen. Every second (or more often in advanced levels), a piece comes in from the side and possibly pushes other pieces forward. Two consecutive pieces will never come in from the same quadrant, and runs of consecutive identical pieces on one row are longer, statistically, than one might expect. If a piece falls into the center square, the game is over. (wiki)