Crimson Sea – XBox

Crimson Sea - Platform: XBox

EX mode:
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Successfully complete the game to unlock the EX mode option. This option allows 
you to play the game again with the money available at the end of your last 
game, and unlocks new items.

G-Squad mode:
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Repeatedly fail a mission to unlock the G-Squad mode option, which allows the 
game to be played on an easier difficulty setting.

Infinite weapons:
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When you get to the research center on Crimson (the big red place with a lot of 
"Mutons"). Buy a lot of parts for your weapon and finish the level with them. 
The next time you return to quest mode you should get the weapon parts you 
bought in the last mission. You can sell those and get new ones. You can still 
keep the old weapons if you finished the level with them. The same works for 
your Neo-Psionics.

Defeating the first Boss:
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Use your tracking system (press R). Keep shooting until he goes to somewhere 
else. Shuffle until you track him again and repeat this process until it he is 
defeated.

Defeating the final Boss:
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Have at least two Medixir items, the Leviathan 3, and Vulcan 3 barrels. Use L so 
you can sway from left to right, keeping the monster in your screen. Take the 
Boss' HP all the way down until he has only a little remaining. Use the 
Leviathan 3 to do this, then use the Vulcan 3 for the finishing touch. You will 
probably have to use at least one Medixir before this point. Make sure you do 
not use the other. Wait until you die to use it. Do not use any Neo-Psionics to 
fight him; only use Cure 2 and 3 on yourself.