Mega Jump:
On Controller 2, press & hold Right.
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Animation in Slow Motion:
Hold up on Controller 2
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Instant Time Stopper:
Hold Up & A on Controller 2 to freeze everything. You can only jump & shoot. This is good for defeating difficult bosses like Shadow Man to nab some good weapons quickly.
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Zombi MegaMan:
First fall into a pit. Make sure you're hold right on Controller 2. Wait & you'll hear the "death" sound. When you're energy is completely empty, get out of that pit quickly by using Mega Jump. You can't fire your normal cannon unless you have a Rush Adapter turned on. You can also use Master Weapons