X-Men - Reign Of Apocalypse - Platform: Gameboy Advance

Play As Bosses:
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Complete the single-player mode. When you hook up the Game Boy Advances 
and select a mode, you can choose from Bosses (but not mini-Bosses).

Special move:
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Press A + B to do a special move. Note: This takes away a little bit of life.

Cyclops:
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Choose Cyclops when selecting a character. He has no punch combo, so you 
can continuously punch one enemy till he is KOd without having to stop, 
unlike the other X-men who can only punch three or four times. 
Note: This will not work on most Bosses. mini-Bosses and Sentinels.

Defeating Night Crawler:
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Knock Night Crawler onto the spikes that appear from the floor. 
Keep punching him, and the spikes will help kill him quickly, of
ten without hitting you back.