Popular Xbox Live community site My Gamer Card discovered full Achievement lists over the weekend for a trio of vintage Sega titles that were previously unannounced for the service. Included among the games revealed were Altered Beast, Comix Zone, and Shinobi.
Although we're still waiting for official confirmation from Sega, these sort of leaks generally tend to be pretty reliable. The only thing that's not too certain is who would actually spend the money on these games individually when Sonic's Ultimate Genesis Collection contains all three -- and over 40 others -- for just under 30 bucks.