Completion bonuses:
Complete the game by finishing World 8 to unlock “Boss Mode”, “Gachapon”, and “Sound Test” options as well as World 9. To access the new options, press R at the level selection screen.
World 10:
To unlock World 10, beat Boss mode with either Stapy of Stafy in under 9:00. World 10 is a series of time attack levels that includes a new Boss. To face the new Boss, you must complete Level 10-1 with a time less than 0:45, Level 10-2 with a time less than 2:20, Level 10-3 with a time less than 3:50, Level 10-4 with a time less than 2:10, Level 10-5 with a time less than 2:50, and Level 10-6 with a time less than 2:30.
Alternate ending:
You will receive an alternate ending the second time that you complete the game.
Birthday greeting:
To receive a birthday greeting at the introduction screen, change the current DS system date to the date you entered for your birthday.
Easy pearls:
To easily gain pearls, in Hotcha Springs (Level 2-1), go to the part where there is a little rock below the door you just entered, little white fish to the top left corner of the stage that inflate when you touch them, and a line of fish on both sides of you. Start by going to one line of fish and using the spin attack to take out the line of them, then go to the other side and take out that line. Continue to repeat this, going from one side to the next, until you get as many pearls as desired.
Super Mario World easter egg:
The background music of the “Abilities” screen is the same music from the Special World of Super Mario World.