Flat Cube is a solo card game consisting of six cards with a picture of half a coloured cube on each side, which will form a whole cube when placed next to the correct side of another card. The player shuffles the cards then places them face up in a row. The aim of the game is to make all the cards line up with matching cubes (except for the two on either end, which will only match on one side). In order to do this, the player must pull two (and only two) side-by-side cards out from the row and move them to an available slot — either on one end or in a space created by moving two previous cards. Continue doing this until the objective is complete, leaving no spaces and moving only two cards at any one time.