The default rule in FreeCell is that you can only move 1 card at a time. However, by using the free cells and empty tableau columns, you can move card sequences at the same time. Computer versions of FreeCell automatically determine whether moving a certain stack of cards is allowed, making it much more convenient to play FreeCell on a computer compared with physical cards. The amount of cards you can move at the same time is calculated as follows: (1 + number of empty free cells) * 2 ^ (number of empty tableau columns).