Mini-gun:
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At the „Cheats” menu in the shop, press Down, Left, Right, Up, Right,
Up, Left, Down to unlock the mini-gun.
Ultimate lightsaber:
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At the „Cheats” menu in the shop, press Right, Down(2), Up, Left, Up(2),
Down to unlock the ultimate lightsaber.
Lightsaber Throw:
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At the „Combat Upgrades” menu in the shop, press Left(2), Right(2), Up,
Down(2), Up to unlock the Lightsaber Throw upgrade.
Spider Droid:
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At the „Droid-Jak Upgrades” menu in the shop, press Up, Left, Down,
Left, Right, Left(3) to unlock the Spider Droid upgrade.
Big head mode:
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At the „Cheats” menu in the shop, press Up, Down, Left, Right, Left,
Right, Down, Up.