In brief: The first official day of summer is just a couple of weeks away, but GOG is gearing up early with the launch of its annual summer sale. There's a lot to digest but fortunately, GOG has broken down its more than 3,500+ deals into a variety of categories including decade.

The 80s collection includes Metal Gear for $4.19 as well as 65 percent off Indiana Jones and the Last Crusade and 75 percent off Personal Nightmare .

Fans of 90s games have plenty to choose from as well. Tom Clancy's Rainbow Six and Total Annihilation: Commander Pack are down to $2.49 each while Myst Masterpiece Edition is going for $2.39 and Thief Gold is down to $0.97. Highlights from the 2000s include Silent Hill 4: The Room for $6.99 , Unreal Tournament GOTY for $1.99 after an 80 percent discount and Tomb Raider: Anniversary for only $0.98.

Those looking to play something a bit newer might consider This War of Mine for $3.99 , Surviving Mars for $7.49, PC Building Simulator for $7.99 and No Man's Sky for $26.99 after an instant 55 percent price cut. Deals from the current decade include 70 percent off Control Ultimate Edition, half off Psychonauts 2 and 75 percent off Shenmue III , bringing the price down to only $7.49.

For a limited time, you can also pick up a copy of Sanitarium absolutely free. This classic psychological horror adventure game arrived way back in 1998 and normally commands $9.99. You'll want to keep your eyes peeled over the coming weeks as GOG will have more daily deals to come.

The GOG summer sale runs through June 27.