Adult Swim is getting in to the holiday season by releasing two Christmas-themed games, Robot Unicorn Attack Christmas Edition [99¢ and Amateur Surgeon Christmas Edition [Free]. Following in the footsteps of previous games, Robot Unicorn Attack Christmas Edition plays nearly identical to Robot Unicorn Attack [$1.99], Robot Unicorn Attack Heavy Metal Edition [$1.99], and Robot Unicorn Attack HD [$2.99]. The main difference with this game is the inclusion of Game Center support as well as holiday themed graphics and music by The Darkness.
Similarly, Amateur Surgeon Christmas Edition plays just like Amateur Surgeon [99¢ / Lite / HD] and Amateur Surgeon 2 [99¢], only with holiday themed tools and surgeries. If you've never played an Amateur Surgeon game before, you should really snag this as it's an excellent Christmasy introduction to the dark humor of the rest of the games.