2004 · (Web published)
Atrium is played on a 5x5 square board.First player has 3 white and 3 black stones,second player has 3 red and 3 blue stones.
On each turn,a player must move one friendly stone to an orthogonal empty space.
The player that makes a orthogonal or diagonal 3 in-a-row with friendly stones of the same color,wins the game.
