Any 'X' on a Button can be filled with a die type of the players choice. More than one X means the player must choose the same die type for all X numbers. Each player starts the game by rolling all the dice they have available. The player with the lowest roll from all the dice on the table gains initiative and goes first. In a tie, the next lowest roll goes first, and so on.
Players then take turns capturing each other's dice with their own.
Players score the number of sides of dice they capture, plus half the number of sides of any dice they have remaining. If this sounds simple, it is. Except that it's not. The true addictive genius of this game starts right about now. Each turn, a player may make a 'Power attack', using any one of his own dice to capture any die of his opponent's that has equal or lower roll.