Wario Land Shake
Complete all of the challenges on a level to unlock music for that level.
Collect all of the treasure.
Successfully complete the game. You can now replay any stage and face the Bosses again.
Easy secret map locations
Successfully complete the game. Go to an area with the map symbol on it to find the secret maps.
Ending song in Media Room
Complete the missions 100%.
Gold Wario room and throne
Get 100% of all treasure.
Successfully complete all stages to unlock a crown next to your name.
Strategy guides from GameFAQs