Sin Tzu is immune to non-special attacks, and is very fast and powerful. Start by watching him run around. He will go into a series of four rushes. Dodge all four of them, and he will backflip. Hit him then. Repeat, but do not stay around to long, until you get a full power meter. When he backflips, hit him with a power attack. Do this for awhile. He will then run into his tower and summon enemies. Beat them up. Meanwhile he will be recovering health and shooting fire at you. After defeating his allies, get your power meter back up and repeat the previous steps. He will now occasionally go into a super-nova attack. Block it at all costs and repeat until he is defeated.

Sin Tzu is blindingly fast, amazingly strong, and invincible to any non-Power Attack. Start by letting him run at you. He will do a four-hit dash. Dodge all times and he will do a backflip. Hit him. Repeat this until your Power Meter is full. Then when he backflips, hit him hard. After a few attacks, he will jump into his tower. He will summon units, regain health, and shoot fire at you. After you defeat the enemies, he will stop healing and fight you. This part is all the same, except he will occasionally move to the room's center and do a crazy attack. The only hope to dodge this is to block.