Future Tactics - The Uprising - Platform: Gamecube

Unlimited turns and movement:
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Press Up(2), Down(2), Left, Right, Left(2), R, L during game play.

Big heads:
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Press Up, Left, Down, Left, Down, Up(2), Left during game play.

Disco mode:
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Press L, Left, L, Left, R, Right, R, Right during game play.

Low gravity:
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Press Up(6), Down, Right, Up during game play.

Custom option:
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Get a 100% hit head shot status two times in a row. This option is unlocked 
at the battle mode team setup menu.

Level select option:
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Successfully complete the game two times to unlock the level select option.

Team power option:
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Get two head shots in a row. This option is unlocked at the battle mode menu.

Humans and creatures option:
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Have a character on your team get their weapon fully upgraded in single 
player mode. Alternately, have no characters on your team miss during an 
entire level in single player mode. This option is unlocked at the battle 
mode team types menu.

Defeat leader option:
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Have all team members complete an episode with 100% health. This option is 
unlocked at the battle mode objectives menu.

The Boat level:
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When you have to get the boat downstream, kill off the two Sintrek, the 
Grenadak, and the other monster. Do not worry if one of your characters dies; 
just take out the monsters. When this is done, destroy the two stones in the 
river, then the bridge (completely obliterate it), then do the same for the 
water mill. Then, destroy the dock. Do not be in the boat when you do this. 
After the dock is destroyed, jump into the boat, release the controller, and 
an intermission sequence will start.

The Stranger level:
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Do not worry if one of your characters dies; they will come back to life 
after you finish the episode. However, to make sure you have a nearly 100% 
chance of winning, get on top of the roofs when no monster is there. 
Once this is done, you can snipe away at your enemies. After you shoot, 
go all the way back to the mountain that touches the roof, but do not go 
down. Shield, because the monsters will shoot your building. If you are all 
the way back, you will not get hurt. Do not worry -- the building cannot 
crash and you will be fine doing this.