Wario Land 4/Sound Room

After beating the Spoiled Rotten, you will gain access to the four main passages and the Sound Room. The Sound Room is the room where all the CD from the CD Chests go when you find them. Some of the CDs are strange or pointless, but they're still fun to listen to.

If you manage to get over 10,000 points in all 18 stages, you will unlock the karaoke mode, with a special song track. You can also put the cursor on "Exit" and press ++++ to force the karaoke mode to appear, regardless of your scores.