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Akuma/Gouki is a hidden boss in the recently released game

To fight Akuma:
Get at least 4 perfects (Either form the initial 8 warirors or the boss rush)
No continues used
Get Bison to low health and Akuma will appear during the fight.

I feel sad for the guy who tried all that hardship only to get killed in the first 3 seconds.

An interesting fact about this game is that it was created by a fan developer, Seow Zong Hui, who showed it to Capcom and agreed to make it official.