Jak II - Platform: Playstation 1

Infinite Orbs: 
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For any Underground Orb mission, if you grab the Orb at 
exactly 0:00, you'll get a "Mission Failed" and also the 
3 Orbs you won. If you choose to try again, you can do 
this over and over and keep obtaining 3 more Orbs. 

Dark Jak vs Final Boss:
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After the cutscene before the final battle, hold R1 and 
you'll transform (or stay as) Dark Jak, regardless of Dark 
Eco meter. 

Unlockables: 
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Alt. Scrap Book        - Collect 200 orbs 
Big Head               - Collect 30 orbs 
Hero Mode              - Collect 200 orbs 
Invunerability         - Collect 175 orbs 
Jak's Goatee           - Collect 5 orbs 
Level Select           - Collect 145 orbs 
Mirror World           - Collect 15 orbs 
Peace Maker Gun Course - Collect 105 orbs 
Reverse Races          - Collect 135 orbs 
Scene Player Act 1     - Collect 65 orbs 
Scene Player Act 2     - Collect 95 orbs 
Scene Player Act 3     - Collect 125 orbs 
Scrap Book             - Collect 55 orbs 
Small Head             - Collect 45 orbs 
Unlimited Ammo         - Collect 155 orbs 
Unlimited Dark Jak     - Collect 165 orbs 
Vulcan Fury            - Collect 75 orbs