Fourmation is a game that elegantly combines math with strategy. The object is to connect four zones in a row: up, down or diagonally. But in order to place your colored marker, you'll have to make the number on the desired spot from the sum of one or more of the number cards in your hand. Outnumber all other players in a contested zone to put it back under your control and complete the winning "fourmation". The game board can be turned and rearranged to create a different layout every time. This is a fun alternative to flash cards for upper level addition that your kids will love. Just4Fun is the original version of the game with identical rules but without the modular board.