(Disclosure: This site contains product affiliate links. We may receive a commission if you make a purchase after clicking on one of these links. Read our affiliate disclosure for more info.)
StackSocial has a few game offers going on. All of them activate on Steam.
The Serious Sam Gamer Bundle $25 – includes:
Serious Sam 3: BFE + Bonus Packs
Serious Sam 2
Serious Sam Double D XXL
Serious Sam HD: The First Encounter
Serious Sam HD: The Second Encounter
Serious Sam: The Random Encounter