Get 100 points in each of the eight stages (except the secret stages) in the indicated World (800 total points) to unlock the corresponding Extra level. To do this, you must collect 20 Red Coins, 5 Flowers, and 30 Stars.

Extra 1: Get 800 points in World 1
Extra 2: Get 800 points in World 2
Extra 3: Get 800 points in World 3
Extra 4: Get 800 points in World 4
Extra 5: Get 800 points in World 5