Enter the following codes at the title screen
|Unlockable||How to unlock|
|Genin Jinn (Shadow Clone and Turbo MegaMan)||Press [Shoot] + [Shift Weapon Right] button simultaneously; cannot be disabled for duration of session once activated|
|Already have Hadoken||Press and hold [Jump] + [Shoot] buttons for ~5-6 seconds.|
When you reach the portion of Seth's lab where you need to enter the teleporters to re-challenge all 8 bosses you fought befre, look for a computer in the background that has two black and white swirling orbs. Shoot the orbs with a charged Mega Buster shot and they should drop a large Health and Weapon Energy Tank. These orbs will reappear after you defeat each boss in case you need to recover your energy.
Complete the game with 4 or more Perfects. You will be able to fight against Akuma after the final battle.
Earn Perfect in 4 battles in Boss Rush before Bison, and Sagat should challenge you ahead of the final battle.
At the stage select screen, highlight Ryu and hold the [Shoot] button. Then enter Right, Right, Right, Left. A sound effect should play if you entered the code correctly. You can now play a version of Mega Man without his helmet.
During any level, pause the game and hold down the Jump button (default "L" key), then enter the U, D, D, and D buttons (default W, S, S, S). Guile's theme music from SFII should replace the level's BGM until you enter the aforementioned code again.