Slam Zero is a zero-gravity sport played by teams of varying size with players wearing lightweight protective suits and helmets. The player's suits are equipped with stabilising and thrust mechanisms that allow them to move around the play area as required by the dictates of the game. The main game variant is played in a transparent spherical "Play Arena", fifty metres in diameter.
War is a four-dimensional strategy game similar to chess. It is a two-player game, with someone playing either another person or the computer and is played in a hologrammatic "arena" (the play area). There are several variants but the "War Game Society" defines the game as being based in a one-metre diameter spherical arena each with around four thousand distinct locations.