Abstract: The invention provides game apparatus for use in a rebound ball game in which a player causes a ball to impact a target surface and to rebound therefrom. The apparatus comprises at least one multi-sided game ball having partially spherical surface regions and a plurality of deflector formations or facets) directed outwardly, for causing the game ball to rebound erratically from a target surface in use. The facets are contiguous with the partially spherical surface regions. The ball surface is marked with indicia, for example numbers. These may be used in mathematical games. A method of playing such a game is disclosed. This involves reading a numerical value off the top of a ball after bouncing and catching it, and then performing a mathematical operation upon said numerical value to yield a running total.