Good point Disolitude..I'll post a little more here:
General Features
THE LARGEST COLLECTION OF CLASSIC SEGA TITLES - All the favorites are here including Sonic The Hedgehog, four titles from the Phantasy Star™ series, as well as three titles from the Streets of Rage™ series, to name a few.
UNLOCKABLE CONTENT - Unlock arcade games and interviews with the original game developers as you earn Achievements on the Xbox 360 and Trophies on the PlayStation 3.
ALL TITLES UPGRADED TO HI-DEF - The classic 2D style never looked so good! Each of the titles has been converted to hi-def (720p)
MASSIVE MULTIPLAYER OPTIONS - Play these classics together with a friend from the same console at home.
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I thought the 'MASSIVE MULTIPLAYER OPTIONS' was halarious..play with 'a friend from the same console'. That's some massive options for multiplayer.