At the title screen, select Password, then enter this: A5, B2, B4, C1, C3, C5, D4, D5, E2.
Complete the game with 3 or more Perfects. After the final battle, Akuma will challenge you.
Pause the game in any level, then hold Jump (default L) and press U D D D (default keys W S S S) to have Guile's Theme replace the background music until you put the code in again.
To play as Mega Man without his Helmet, hold shoot on Ryu on the stage select screen and then press Right Right Right Left. If entered correctly, a sound will play and Mega Man will lose his helmet on the stage select screen.
At the title screen, select Password, then enter this: A5, B1, B3, C4, D2, D3, E1, E4, E5.More Street Fighter X Mega Man Cheat Codes @ CheatListingsMore Street Fighter X Mega Man Cheat Codes @ AbsolutCheatsMore Street Fighter X Mega Man Cheat Codes @ CheatHappens