Complete a stage with a time having the last two digits of the same number to have a different color Mushroom house at the start of the World.

Have a time ending in 11, 22, or 33 for a red Mushroom house appears that awards items.
Have a time ending in 44, 55, or 66 on the timer for a green Mushroom house with a mini-game for an extra life.
Have a time ending in 77, 88, or 99 for an orange Mushroom house with a Mega Mushroom.