Surgeon Simulator 2013
This topic is covered better by other wikis or sites. Please see the following links instead:
Surgeon Simulator is a surgical simulation game developed and published by Bossa Studios.
The game has a TF2 related mission, a reenactment of Meet the Medic. Completing the mission awards the player with a Medic figurine that has a cryptic note attached to the bottom. Both Valve and Bossa Studios have stated that it is not a part of any Valve related ARG. It was later revealed that the note was a part of an ARG to unlock the space missions in the game.