The game consists of an "arena" (the game box with an insert) and lots of dice. The goal is to be the last player who still has dice. At the beginning, one die is in the arena. The active player throws another die into the arena. If both dice now show the same number, the player must take them out and end the turn. If not, the player can decide to throw in another die (possibly trying to overturn other dice) or end his/her turn. A die which shows the X face is removed from the game, as is any die which falls out of the arena. A player who holds no more dice is eliminated from the game. The last player who still has dice is the winner.

Players must use actual time as a resource in managing their strategy to best their opponents, using time on different action types and balancing it with time spent planning and analyzing. The winner will be the player who manages and invests their time most effectively and who builds the best engine, not the player who acts the quickest.