Released tomorrow for 400 points and features online co-op. I remember the versus races being a giggle but the co-op was very lame! Player 2 plays as Tails who is invincible but the screen always stays fixed on Sonic. If Tails wanders off too far he helicopters back to the screen - which is useless if Sonic is travelling at speed! Here are the achievments: Emerald Hill 5 Clear the Emerald Hill Zone 1. Fast Emerald 15 Beat Emerald Hill Zone 1 in under 35 seconds in single-player or co-op mode. Fast Chemical 20 Beat Chemical Plant Zone 1 in under 45 seconds. Casino 10 Get to the Casino Night Zone. Super Sonic 20 Become Super Sonic. Extended Super 20 Stay in Super Sonic mode for one minute. Chaos Emerald 10 Get one Chaos Emerald. Chaos Master 40 Get all the Chaos Emeralds. Conquering Time 10 Beat the game in under an hour. All Multiplayer 5 Play all four multiplayer zones. Xbox Live Racer 10 Win 10 versus zones on Xbox Live. Win 35 Beat the game.