Castlevania: Rondo of Blood

The Good
Simply, the music and the gameplay. The music is totally awesome, each stage has a soundtrack of it's own. Gameplay: Timing is really important, just like in other Castlevania series. Nearly all of the levels have an alternate exit with an alternate Boss, providing much to unlock.

The Bad
Said things are that the levels can be nearly too hard, especially some of the bosses (death is a good example). Also the boss battle music is always the same (good) tune, but if you die often.

The Bottom Line
If you like challenging games, or good music, or you are simply a Castlevania fan, this one is a very good choice. But be warned, it's hard, real hard.