gaming... distros?
A distro is a distribution of Linux... think of it like a separate flavor, however it's still Linux at the core.
If a game is supported by Linux, it can be installed on Linux. Period. There's no such thing as a "gaming distro."
There are some games that are supported natively by Linux. For many others, you can try out WINE to try and emulate the games within Linux.
My luck with it has been mixed. As a result, I use Vista to do my gaming. My computer is set up as dual boot primarily for that purpose, however I like having Vista around for the sake of learning purposes since my job revolves around Windows.