Check out those ESRB ratings: M, M, M. I'm pretty sure this is the only week ever where three different M-rated co-op titles were released. House of the Dead Overkill continues a fine line of co-op shooters, this time on the Wii. And the Onechanbara games... well, what can you say? Girls in bikinis, katanas, zombies, and a very large cowboy hat all mixed up into two quite unique co-op gaming packages. You have to give them credit for creativity, for sure. Provided below, for your ease of use, are handy links to Amazon.com for each game; purchases help support Co-Optimus!