The Winter Sale finale is underway on GOG.COM, offering the last few days of up to 91% savings on over 3500 games before the sale concludes on January 4th at 9:00 am EST. They celebrate this by offering a 100% discount on one game, as you can pick up Metro: Last Light Redux for free. The remade version of 4A Games' first-person shooter will be yours to keep if you pick it up between now at 9:00 am EST on January 1st. Here's a refresher on this refreshed version of the game:

Metro: Last Light Redux is the definitive version of the critically acclaimed ‘Metro: Last Light’, rebuilt in the latest and greatest iteration of the 4A Engine for Next Gen. Newcomers will get the chance to experience one of the finest story-driven shooters of all time; an epic adventure combining gripping survival horror, exploration and tactical combat and stealth.

This definitive version also includes all previously released DLC, adding 10 hours of bonus single-player content to the huge solo campaign. Fans of the original game will notice new features and gameplay improvements, including new melee animations, the ability to check your watch and ammo supplies on the fly, and new full-body player animations.