I'm pretty sure this game never saw a release in any of the Americas. The US is part of the North America region. And for instance, I'm pretty sure the SNES was released in Canada, which is not part of the US.
This hack allows you to turn and strafe at the same, ie. adds circle strafing to the game. It was relatively easy to develop after the original source code was released yesterday, even with zero 65816 / GSU assembly knowledge, but there is still one little missing feature: the strafing speed stays the same regardless of whether the run button is pressed down or not. A value that is halfway between the original walking and running strafe speeds is currently used.
Fixing this requires either adding some GSU instructions (instead of just overwriting a couple of existing ones), or a different approach for hacking in support for handling turning and strafing separately of each other. It is quite playable already however.
ROM / ISO Information:
Database match: Doom (USA)
Database: No-Intro: Super Nintendo Entertainment System (v. 20180813-062835)
