Bio Hazard is an unlicensed demake of Resident Evil for the NES by Waixing. Its Mandarin name is 生化危机 Bio Hazard, where "生化危机" means "Resident Evil." The game's physics and aesthetics are based off of the GB game Resident Evil Gaiden.
Like the 3D game it is based on, this game requires the player to navigate a zombie-infested mansion while managing inventory space, ammunition, and puzzle items. Unlike the original Resident Evil however, shooting zombies is accomplished via a mini-game where a moving reticle must be stopped when in range of a target. Also unlike the original game, ammunition does not stack, and items are not droppable.