Steam is growing regular ol' Plants vs. Zombies into the "Game of the Year edition." The free update is available for existing PC copies of PvZ. In addition, PvZ is now available in its GOTY incarnation on Mac for $10. Remember, with Steam, if you own the game for Windows and are a closet Mac user (or vice versa), you also own it for the other system.

The update adds 20 Steam Achievements, Steam Cloud support and the "Zombatar" -- a custom zombie creator. You can also try out the Zombatar on PopCap's site and use the image for any of your social networking sites. In only a few minutes we made what we imagine to be a rabid transvestite b-boy.

This article was originally published on Joystiq.