spoderman: New hint for one of the mystery games from Shifty:
"So to give you an idea on if the mystery game would be worth it, if you have to buy the first one on steam it would set you back around $30"
Meaning it's a Steam game.
amok: does not mean steam exclusive? only that the first game costs $30, thous meaning it is a part of a series?
edit - or by first he means first of the bonus games, making everything I wrote silly...
All we know is that it comes with a Steam key, I don't know if it's exclusive to Steam. Shifty's wording was weird.. I think he meant the first mystery game, and not the first game in a series, but it's confusing.