Oni ROM Download for Gameboy (GB) on Emulator Games. Play Oni game that is available in the United States of America (USA) version only on this website. Oni is a Gameboy emulator game that you can download to your computer or play online within your browser. You can also download free ROMs such as Bionic Commando, Oni 2 - Innin Densetsu and Bionic Battler as shown below. Oni works on all your devices in high quality.