Also unlike other CCGs, the cost to play a card in "UFS" is not a set number of some resource. To play a card in "UFS", players must pass a "control check". A player discards the top card of their deck, and compares its control value (in the lower right) to the difficulty of the card he or she is trying to play. If the control is equal to or above the difficulty needed, the card is played at no cost. If the control is lower, the player must "commit" (turn sideways) foundation cards equal to the difference, or else the attempt to play a card fails and the card is discarded.