Brainstorm is a straight conversion of the game Concentration (also known as Memory). There is a set of 54 cards flipped on their back so every card looks the same. On the flip-side, there are 26 pairs with different motives. The players (in turn) flip over two cards each while trying to find a pair. When a pair is found, it is removed from the table. The goal is to find more pairs than the opponent.