The monsters are hiding and waiting for the command of their leader - Grimace in Wack a Grimace Shake. However, Grimace has disappeared somewhere, perhaps he decided not to contact you and simply ran away, everything can be expected from a monster. But his accomplices cannot sit in their holes indefinitely; they will start to poke their heads out and then you will catch them. Watch for holes in the ground and as soon as the purple head of the monster appears, click on it and get points for dexterity and accuracy. Each successful click will earn you ten points. Only thirty seconds are allotted for the game and the number of points scored in Wack a Grimace Shake depends on your reaction.