qop is a pretty enjoyable puzzle game in which you slide a box around in a direction and it will continue until it meets a block; if you're familiar with ice sliding puzzles in games then it works like such. The game also incorporates two gimmicks, one in which touching a side of a line block will send you to the other, and the other is pairs of blocks that teleport you to each other. These combine to make interesting levels fun to figure out and easy enough for mostly anyone to enjoy.