Stealth ninja platformer Mark of the Ninja arrived on Xbox Live earlier this month, but Klei Entertainment has bigger plans for its title. The developer announced Mark of the Ninja will arrive on Steam on October 16 for $15, and the best part of the news is Games for Windows Live is not included, despite the fact it's published by Microsoft Studios. This should be welcome news for pretty much every PC gamer, as there will be no hoops to jump through to get Mark of the Ninja working. Reviews of the Xbox version hail it as one of the best stealth games in recent memory and watching the trailer below will show you why. Klei Entertainment plans to treat the PC version properly instead of doing a straight port, so the side-scroller should look and play wonderfully when it arrives.