Crosscram is a version of Cram, a game known since the 1950's. Two players place domino-shaped pieces on a square board. Whoever places the last piece, wins; in the misère (reverse) version the player who plays last loses. In normal Cram players can put their dominoes either way, vertically or horizontally, but in CrossCram one player always plays horizontally whereas the other player always plays vertically.

Some analysis of the game is found in the book "Knotted Doughnuts and Other Mathematical Entertainments", by Martin Gardner.

This rule file has three different board sizes: 4x4, 6x6 and 8x8. With normal and misère play the number of variations is thus six.