Sonic The Fighters, Fighting Vipers, and Virtua Fighter 2 are up on Xbox.com now.
Join Sonic and friends in battle in this classic arcade game from AM2. Originally on consoles as part of the Sonic Gems collection, Sonic the Fighters is back with an all-new online mode, including both online versus and tournament play. In single player mode, choose from 10 playable characters and fight through 8 stages to stop Dr. Robotnik and Metal Sonic from unleashing the Death Egg II! Features include: True to its arcade form with all-new online modes All 8 original characters and arenas Online versus mode for head-to-head matches Online Room match mode for up to 6 players
Go back to the roots of 3-D fighting with Virtua Fighter 2, the second title in AM2's flagship fighting franchise. Experience the legendary polygon-based 3-D graphics and fluid fighting mechanics that made the game so influential in the arcades, and later on the Sega Saturn. With all-new online play you can battle friends throughout the world. Features include: True to its arcade form with all-new online modes All 10 original characters and arenas Online versus mode for head-to-head matches Online Room match mode for up to 6 players
Fight with flair in the return of Fighting Vipers, the classic arcade game from AM2 that was later playable on the Sega Saturn. Choose one of nine zany characters--including Grace the roller blader and Raxel the metal guitarist-- and break your opponent's costume-based armor to maximize damage. Take advantage of all-new online modes to battle friends across the world. Features include: True to its arcade form with all-new online modes All 9 original characters, each with their own unique costume and hobby Enclosed arenas, enabling special wall attacks Online versus mode for head-to-head matches Online Room match mode for up to 6 players
Looks like they're doing a great job of the emulation, but are doing bare bones of extra features. I guess it's just $5 anyway.