Some games offer drop-in and drop-out and most games offer play through the single player portion. Here is the complete list of co-op titles that are in compilation.
Amazon.com Product Description
Take a trip back in time to the heyday of the SEGA Genesis console by way of your Xbox 360 with Sonic's Ultimate Genesis Collection. Led by six classic Sonic The Hedgehog favorites, this collection is packed with games from iconic franchises you know and love, like Ecco the Dolphin, Streets of Rage, Golden Axe and Phantasy Star, but also contains many others you may have missed. The largest collection of classic SEGA titles available to date, these 40+ games bring classic single player and multiplayer action to life like never before as the best of the SEGA Genesis catalog is reborn on the Next-Gen stage of Xbox 360.
This page contains co-op info for Sonic's Ultimate Genesis Collection on the Xbox 360. All information about Sonic's Ultimate Genesis Collection was correct at the time of posting. Information is subject to change. If you see any errors please email us.