A doubling cube can be used to speed up play and add more depth to strategy. At the start of the game, the cube is put in a neutral position at the top right corner of the screen.
While the cube is in this neutral position, either player may propose that the game is played for twice the current stakes, by clicking on the cube on their turn.
The opponent may accept it by clicking on the cube, or has to give up the match immediately.
If the opponent accepts, the cube is moved next to his name, and is showing the current stake.
The right to re-double belongs exclusively to the player who last accepted a double, who has the cube next to his/her name.
The maximum stake is 32x.