Aa brand new costume will be available starting tomorrow for all three versions of Rocksteady's Batman: Arkham City (PS3, 360 and PC), and it will be completely free. Apparently it's their way of saying thank you for making their game one of the bestsellers this year.

The costume is inspired by the comic series Batman Incorporated, and largely reminiscent of the real retro Batman duds—yellow highlights, oldschool symbol and all. The DLC will be available in the marketplace, but unlike other costumes, you don't have to beat the game first to unlock it; just enter "Left, Left, Down, Down, Left, Left, Right, Up, Up, Down" on the menu screen after your save file is selected, and voila.

We're sure you can find something to complain about with this, so go ahead in the comments or on Facebook or Twitter.