To unlock Akuma as a playable character:
1. Unlock Cammy, Fei Long, Dan, Sakura, Rose, and Gen.
2. Pick a character you have already used to beat Arcade Mode.
3. Win all your matches without continuing and without losing any rounds
before fighting with Seth.
4. You need to get at least one "perfect" win in a round, and more than one
depending on how many rounds per match you are playing.
- 1 round match: 1 perfect round or more
- 3 round match: 2 perfect rounds or more
- 5 round match: 3 perfect rounds or more
- 7 round match: 4 perfect rounds or more
(including the last battle against Seth)
5. If you meet these conditions, Akuma will appear. Defeat him to unlock
Akuma as a selectable character.