To enter this code, you need to pause the game while you're on any level. Hold jump
(default L) and press U D D D (default keys W S S S) to get Guile's Theme to replace the
background music. You can change it back by putting the code in again.
Use Hadoken Ability
To get the ability to use Hadoken manually on demand, without any meter or defeating
Ryu, just press and hold the jump and fire buttons for about 5-6 seconds.
Genin Jinn Hidden Ability
To get the Genin Jinn (Shadow Clone and Turbo MegaMan) ability, press shoot and (Shift
Weapon Right) button at the same time. But be careful because it can't be disabled once
Street Fighter X Mega Man Unlockables & Awards
To get to fight against Akuma, you need to get at least three PERFECT fights, and then
complete the game (the perfect fights must be in the game you defeat), and then, after
the final battle, Akuma will challenge you. That's it!