Complete the indicated task to unlock the corresponding levels of the sixth, bonus, restaurant.

Levels 1 to 4: Reach Expert goal on at least five levels in the first restaurant.
Levels 5 to 8: Reach Expert goal on at least five levels in the second restaurant.
Levels 9 to 12: Reach Expert goal on at least five levels in the third restaurant.
Levels 13 to 16: Reach Expert goal on at least five levels in the fourth restaurant.
Levels 17 to 20: Reach Expert goal on at least five levels in the fifth restaurant.