Here's a complete set of passwords for one of the most addicting games ever produced for the Virtual Boy.

Easy
6835 - Sinister Forest.
9081 - Desert of Desolation.
2473 - Doom Castle.

Normal
2695 - Sinister Forest.
1038 - Desert of Desolation.
6934 - Desert of Desolation.
1298 - No sub-Bosses.
4390 - Star Medal.
3281 - Moon Medal.
5607 - Sun Medal.