Capcom Classics Collection - Platform: XBox

Cheat mode:
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At the Capcom Classics Collection title screen, press L, R, Right Analog-stick 
Up, Right Analog-stick Down, L, R, Left Analog-stick Up, Left Analog-stick Down, 
L, R, D-pad Up, D-pad Down. If you entered the code correctly, the message "All 
Locks Open" will appear at the top of the screen. All bonuses in all games will 
be unlocked. Additionally, while playing Ghosts N Goblins, Ghouls N Ghosts, or 
Super Ghouls N Ghosts, press Right Analog-stick Left or Right Analog-stick Right 
to access any weapon.

Level 6 in Ghosts And Goblins:
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When you are on level 6, use only the shield as your weapon or the game will 
send you back to the beginning of level 5, saying that there is no effect for 
your weapon.

Defeating M. Bison in Street Fighter 2:
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To easily defeat M. Bison, attack him with leg sweeps while he is standing. He 
will not usually block this attack, and if you do it enough times, he will 
become dizzy.