Mahjong Companion ROM Download for Nintendo (NES) on Emulator Games. Play Mahjong Companion game that is available in the United States of America (USA) version only on this website. Mahjong Companion is a Nintendo emulator game that you can download to your computer or play online within your browser. You can also download free ROMs such as Mahjong (VS), 4 Nin Uchi Mahjong [h1] and Family Mahjong 2 - Shanghai Heno Michi [t1] as shown below. Mahjong Companion works on all your devices in high quality.