GMG is getting hammered right now, but this will be valid for 24 hours.
Spec Ops, Sid Meier's Pirates,and two mystery games for free when you use the code GREENMANGOLD.
Mod: US$1 cashback after US$1 purchase with vote is no longer available (wasn't available at all?) Use code GOLDENFLASH to simply buy it for US$0.50
Mod 2: Actually was a duplicate to this deal, however duplicate exception now applies as it is well past 50 votes. It seems this offer was misadvertised elsewhere as completely free with an invalid code.
Good luck!
Been trying for about 20 minutes on and off to no avail, site is really not handling the extra traffic.