Mark of the Ninja's "Special Edition" DLC is available now on Steam and XBLA. The additional content will set armchair ninjas back 400 MSP ($5), and offers players the chance to portray Dosan, the game's mysterious tattoo artist.
Dosan's adventure is set before the events of the game and includes new challenges as well as two new items. The new items and play-style introduced by Dosan can be used in the original game. Mark of the Ninja's Special Edition DLC also offers developer commentary tracks for every level of the game.