Released: 2001
Developer/Publisher: Croteam for Gathering of Developers
Platform(s): 360, XBOX, PC

A lamely-titled first person shooter from an obscure developer that was originally released only for PCs, SS became a juggernaut franchise based on depth of plot, gameplay, and humor (OK, maybe the name isn't so bad after all). Never to be confused with the Sean Penn flick I Am Sam (though released in the same year), Serious Sam still gets props as one of the best action-adventure games of the decade.

Developer Croteam had only six employees and four contractors when Serious Sam was conceived and produced.