Honestly, that's a hard one. I'm going to go for Garry's Mod, since it combines textures from other games, and thus giving you more choices when it comes to creating. Options are limitless, and as a writer and editor I sure do love creating! :D
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"We are made wise not by the recollection of our past, but by the responsibility for our future."
Probably the only one around here who's favorite is a free to play game; ghost recon phantoms. i've been playing it for quite some time now and have multiple accounts. quite curious if anyone wants to buy one? pm me. My second favorite must be skyrim, I'm also really excited for no man's sky and my third best is just the whole trackmania series. my number four is portal 2.