After you beat the normal game, you can unlock two secret characters to play as. If you beat the game and collect 30 Oboro Clan coins, you will unlock the demon-possesed, Moritsume. He is faster and stronger than Hotsume, but his Akujiki energy drains faster. Now here's something great! If you beat the game and collect 40 Oboro Clan coins, you will unlock Joe Musashi from the original Shinobi. Musashi has unlimited shurikens and no cursed blade.