Mark the Ninja!
This game is great! It makes stealth fun. It also has a cool comic book look to it. Overall it was obviously made by people that knew what they were doing. Stealth games are usually difficult to play due to stiff controls or it being in first or third person. Those are fine ways to do stealth games. Mark of the Ninja just makes the 2D plain make sense. You never feel like the game is the reason that you're dead. All of the mistakes are up to you. Mark of the Ninja gives you all of the tools to do your job and man is it fun. Go get it!