Successfully complete the game. You can now replay any stage and fight any of the Bosses again.
Successfully complete the game. Go to an area with the map symbol on it to find the secret maps.
Collect all of the treasures to unlock the hub update.
Get 100% of all treasure to unlock the Gold Wario room and throne.
Successfully complete all of the challenges on a level to unlock music for that level in Media Room.
Successfully complete the missions 100% to unlock the ending song in Media Room.
Successfully complete all stages to unlock a crown next to your name.