https://www.gamespot.com/articles/get-a-free-pc-game-on-gog-right-now/1100-6456751/

GOG's Chinese New Year sale has now begun, offering tons of discounts on a variety of great PC games. To celebrate the start of the sale, GOG is also giving away one title completely free of charge just for visiting digital store, although you'll have to do so soon, as the offer won't be available for very long.

Right now, everyone who visits GOG can download the classic fighting game The King of Fighters 2002 for free. The offer will expire at 6 AM PT / 9 AM ET / 2 PM UTC on February 15, giving you a little over 40 hours as of this writing to grab the title while it's still available.