Try to count down the given number of different stones to zero before your opponent does. You're playing against your opponent on the same board, you make moves alternately.
Bonus points are awarded when the fields under the stones are cleared. The "shuffle" and "change" buttons become available when sufficient bonus points have been awarded.
The level is lost as soon as no more moves are possible and the played bonus points are not high enough to start a new shuffle or the opponent has counted down all counters to zero.