In Ctrl, players try to dominate a cube by crawling over it with their colored bricks, preferably covering other players' bricks along the way. In more detail, you start with a 3×3×3 cube that has one block of each player color stuck into one of the cube's holes. (In a two-player game, each player controls two colors, but at the start of play they secretly choose one of those colors to be their scoring color, with the other color serving only as a blocking mechanism.) Each player has a matching colored flag that sticks out of their block. On a turn, a player removes their flag from its current location, adds one cube of their color to the side of any of their blocks (where such a move can be made), then they "grow" their color by adding two blocks in a straight line from the block they just added, crawling around corners and covering other players' blocks if needed.