Sword upgrades
You can unlock different swords by freeing the prisoners. Here's a list of all the ones I know:
Fire sword- Free 30 prisioners in the village level
Ultimate crystal sword- Free 30 prisioners in the forest level
Electric sword- Free 30 prisioners in the mines level
Hope that help's ya!
More tricks, tips and cheats for this game are right here - Samurai Jack: The Shadow of Aku cheats
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