Major video game characters don’t cross over nearly often enough for my tastes.  There’s something exciting about two or more major characters from different game universes appearing together, showcasing their unique abilities and gameplay styles, along with their rogues gallery of enemies and other distinct elements from their game worlds.  Sadly, there are few examples where this is done well; the Marvel Vs. Capcom games, Battletoads & Double Dragon, and the Smash Bros. series come to mind.  More often, we get efforts like Sega Superstars Tennis, RoboCop Versus the Terminator, and that awful Spyro/Crash Bandicoot crossover for the Game Boy Advance.  Two years ago, two of the biggest names in the gaming world brought their crossover onto the Olympic stage when Mario and Sonic the Hedgehog teamed up to bring us Mario & Sonic at the Olympic Games.  Naturally, the game was a huge financial success, and practically demanded a sequel.  Sony has brought us that sequel, this time with a significantly chillier setting and a whole new array of Olympic events, in the form of Mario & Sonic at the Olympic Winter Games.