You build as many words as possible using adjacent letters. The longer the word, the higher you score. For example, if the top line has the letters C, A, T, S, and the second line has the letters O, L, D, X, you could form CATS from the first line and COLD using the C from the first line, and the O, L, D from the second line. You can play in either a 4 by 4 grid, a 5 by 5 grid or a 6 by 6 grid, and you can play an untimed version, or a timed version.