In the first three versions of Street Fighter II, "World Warrior", "Champion Edition" and "Hyper Fighting", Ryu and Ken's Hadoken sprites would sometimes appear orange. Developer Akira Nishitani confirmed that this was added as an Easter egg, and wasn't a glitch as previously thought.

In later versions of the game, starting with "Super Street Fighter II: The New Challengers", Ryu would receive a legitimate orange Hadoken special move called "Shakunetsu Hadoken"

Champion Edition was the only iteration of Street Fighter II to be released on the PC Engine, known in the USA as the TurboGrafx-16. Despite the original game's relatively large size, this port did not take advantage of the console's CD-ROM attachment. Instead, the game was released on a 20 megabit HuCard. For context, all other games released on HuCard had a capacity of no more than 8 megabits. As the standard PC Engine controller only had two action buttons, a new controller called the Avenue Pad 6 was released specifically for use with the game.