https://www.pcgamer.com/flash-sales-are-back-and-king-of-fighters-2002-is-free-in-gogs-chinese-new-year-sale/

GOG is celebrating the Year of the Dog in the form of a Chinese New Year sale that features discounts on more than 500 games, hourly flash deals, additional games on GOG Connect, and until 9 am ET on February 15, a free copy of King of Fighters 2002 for everyone who wants it.  

The current flash sale is Shadowrun: Hong Kong, which is 85 percent off for the next 55 minutes as of right now, and Thief Gold, down to $1 for the next couple of hours. Those choices will likely have changed by the time you read this but you get the idea: Previous flash sale offerings have already included Deus Ex Game of the Year Edition, Vikings: Wolves of Midgard, and This War of Mine Soundtrack Edition.