This is a ROM hack of the original Metroid game, created by Chris Allen. It's a fan-made modification changing the game's original assets and content. The changes are substantial enough to warrant its own listing, indicating a different game experience compared to the original. The hack's exact changes are unknown without further information about the specific modifications implemented by Chris Allen. It signifies the enduring impact of the original Metroid on the gaming community, resulting in fan-made projects that redefine its experience.

Metroid (USA) [Hack by Chris Allen v1.0] (~Metroid Master)

Metroid (Japan) (Rev 3) (3DS Virtual Console)