Instructions
Defeat Orochi Hellbeast by performing a series of strong, jumping attacks that will weaken and kill him. A giant wooden door will appear once you have beaten Orochi, but you will need to unlock the axe to break the crystals near the door in order to open it.
Fight Kintaro, who uses long jumps to fight you. Use projectile attacks while dodging Kintaro's fireballs to beat him, trying to save as much health as you can for the final boss, Shao Khan. Defeat Kintaro and you will unlock the axe.
Go back to the wooden doors that lead to the final boss fight and use your swing ability to swing the axe and break the crystals. You will now be able to face Shao Khan.