If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Monsters have started to conquer the world by killing all the humans. There is only one samurai who can stop them. Help the samurai to kill all the monsters in their underworld, and then make your way to the exit. Destroy all of the enemies and potions to unlock the exit. Good Luck
Use arrow keys to move.