Altered Beast is an online MASTER game that you can play at Emulator Online. This free Sega Master System game is the United States of America region version for the USA. Altered Beast is a single title from the many arcade games, action games and fighting games offered for this console. If you enjoyed playing this, then you can find similar games in the master games category. Altered Beast game is from the various retro games on the site, and there are more games like this, including Pokemon Altered Emerald, Mega Man Battle Network 6 – Cybeast Gregar and Altered Beast: Guardian Of The Realms.