Themed as a battle between two pairs of space stations played on a 22 x 30 square board. The space stations may move one square and rotate up to 180 degrees each turn. The space stations fire missiles of which there are two types. Neutron missiles which move diagonally and proton missiles which move orthogonally. Depending on where they hit a space station (each occupies 11 squares) they do different kinds of damage. The object is to disable/destroy the opponents space stations.