An official release date has been set for Mario & Sonic at the Olympic Winter Games, landing the four-player co-op Wii title on store shelves well in advance of the actual winter season. October 16th, you'll be free to ski and skate your heart out as your favorite character from either series, and better yet: with up to three friends!
In all honesty, we can't seem to get a good head of steam for this one just yet. The original was developed and released without much ado, and while it was met with fairly decent reviews it didn't cause any major ripples among Wii owners. That said: co-op is always better than the alternative, and we look forward to seeing if this sequel can inject new energy into the unique fledgling series.
Source: Link 

Thanks to Joystiq for the screengrab
An odd preview popped up at Joystiq for Mario and Sonic at the Olympic Winter Games during E3 week, confirming four-player co-op locally for Wii.
While this is small-time news for most gamers, Wii owners should be glad that even fairly obscure games are getting the co-op treatment. Whether or not Olympic Winter Games fares well in sales, developers adding co-op is a habit that we could get used to.
Source: Link 
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| Game | Platform | Date |
| Serious Sam HD | 11.24.2009 | |
| Star Trek: D-A-C | 11.27.2009 | |
| GREED | 11.29.2009 | |
| Avatar | 12.01.2009 | |
| Alien Breed Evolution | 12.01.2009 | |
| Spelunker HD | 12.01.2009 | |
| Matt Hazard: Blood Bath and Beyond | 12.01.2009 | |
| Resident Evil: The Darkside Chronicles | 12.01.2009 | |
| Matt Hazard: Blood Bath and Beyond | 12.01.2009 | |
| Serious Sam HD | 12.21.2009 | |
| Guitar Hero Van Halen | 12.22.2009 | |
| Guitar Hero Van Halen | 12.22.2009 | |
| Guitar Hero Van Halen | 12.22.2009 | |
| Guitar Hero Van Halen | 12.22.2009 | |
| Mario and Sonic at the Olympic Winter Games | 12.31.2009 |
Co-Optimus Co-Op Events
Our monthly Xbox Live Co-Op Night gets you online to meet other co-op gamers. An Official Xbox Live Event!
Games for Windows Co-Op Night features monthly PC co-op gameplay. An Official GFW Event!
| Game | Platform | Added |
| Donkey Kong Country | 11.20.2009 | |
| UP | 11.20.2009 | |
| UP | 11.20.2009 | |
| UP | 11.20.2009 | |
| Diner Dash | 11.19.2009 | |
| Conflict: Vietnam | 11.18.2009 | |
| Conflict: Vietnam | 11.18.2009 | |
| Conflict: Vietnam | 11.18.2009 | |
| Conflict Global Terror | 11.18.2009 | |
| Conflict Global Terror | 11.18.2009 |
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Call of Duty: World at War on Wii
AI War on PC
Castle Crashers on Xbox Live Arcade
Pixel Junk Monsters on Playstation Network
View the top Co-Op Games by platform including our family friendly list!
Launched January 28, 2008, Co-Optimus is a website dedicated to cooperative games. The site features a focus on co-op games through a game database, blog style commentary, and featured articles. Our goal is to bring you the most comprehensive source of co-op gaming information and to inform gamers about the co-op experience.











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