The age of silent, stealthy, deadly ninjas is not over! Become one of them in Mark of the Ninja, a Klei Entertainment action adventure. An immersing story coupled with awe-inspiring animation and scenery is sure to have you loose track of time and sense of reality while you’re playing the game! You have a choice of becoming a silent assassin or an invisible ghost as you make your way through the story, gathering the perfect toolset for your style of play.

Mark of the Ninja is a side-scrolling action stealth video game developed by Klei Entertainment and published by Microsoft Studios. It was announced on February 28, 2012 and later released for the Xbox 360 via Xbox Live Arcade on September 7, 2012. A ...   more on Wikipedia

This game is not what you usually see on Steam. In Garry's Mod, you enter a physics sandbox which provides you with tools to make what you want happen and leaves you to it. You can play alone or join thousands of other players kidding around and playing with physics. If you do try this game, do check out its Steam Community Workshop

Garry's Mod or GMod (stylized as garry's mod) is a sandbox physics game using a modified Source engine, created by Garry Newman. Garry's Mod was originally a modification, a "mod", for Valve's Half-Life 2, but was later made into a standalone game. I ...   more on Wikipedia