In the crystal challenge, mushrooms appear on random squares. These mushrooms are poisonous and the player will fail by stepping on one. The goal is to win the round while avoiding the mushrooms.
In this minigame, points are scored by smashing mushrooms with a hammer. There are two varieties of mushrooms. Normal mushrooms are red in color and are by far the most common. These are worth 2 points to start with. After one has been left alone for three seconds, it begins to shake, and is worth 3 points. If it is standing for five seconds, it shakes more violently, and is worth 5 points. The other type of mushroom are gold mushrooms. These are worth 10 points to start with, then 15 if shaking mildly, and 20 if shaking violently. If a mushroom is shaking violently for one second (i.e. left standing for a total of six seconds), it explodes and cannot be smashed for points.