This week the Gametap PC game download service is making some folks happy by extending the free-to-play run for one of its games. S.T.A.L.K.E.R.: Shadow Of Chernobyl, the 2007 FPS from GSC Game World, was placed on the free list last Thursday but Gametap has decided to keep it free to play for another week.

Added to the free-to-play list for one week is Syberia, the classic adventure game from Microids. Added to Gametap's paid premimum service is Post Mortem, yet another great adventure game from Microids. And next week prepare to get inside a 50 foot tall killing machine as Microsoft's Mechwarrior 4: Mercenaries is added to Gametap's premimum service on May 28.