Start a new game.
Save the current game.
End the computer's calculation of a move or finish off the animation stage of a move. If calculating, the computer will choose the best move it has found so far. Note that this toolbar button is disabled most of the time and is enabled only while the computer is calculating or animating a move.
Get a hint as to the best move to make next. The hint is calculated by computer player 1 or 2, depending on whether you are player 1 or 2. See the Game Configuration section for more details.
Undo the last move you made.