Thanks to several huge announcements at GDC, Valve is having a big week with its Steam gaming service.

To celebrate the acceptance of its SteamOS by several major developers, Valve is holding a blockbuster sale on all 52 titles that are confirmed so far for the operating system. In fact, the majority of the games are already available for SteamOS, though most of them are compatible with Windows and Mac OS X, too.

Price discounts range from 10 percent off all the way up to 80 percent off, with the lion's share of them looking to be in the 50 percent to 75 percent off range.

Strangely, nine of the titles listed on the SteamOS sale page don't appear to be discounted at all. Dying Light is listed, for example, at its full, regular price of $59.99. So technically, that means there are just 43 titles on sale. Regardless, there are some fantastic prices here.

While a few of these games you might not recognize, most of them are major titles. You'll find Shadow of Mordor for $30, Dead Island for just $5, Transistor for $6.79, Borderlands 2 for $5, Borderlands: The Pre-Sequel for $30, The Witcher II: Assassins of Kings - Enhanced Edition for a measley $4, The Banner Saga for $10 and many more.

You can even preorder Batman: Arkham Knight and The Witcher III: The Wild Hunt, each at 10 percent off. Given that brand new AAA titles are never, ever launched for less than $60, that's a really big deal.

Here's the full list of titles on sale. Valve hasn't said how long the SteamOS sale will last, so grab 'em while they're hot!

The Banner Saga
Batman: Arkham Knight
BattleBlock Theater
The Binding of Isaac: Rebirth
Borderlands 2
Borderlands: The Pre-Sequel
Chivalry: Medieval Warfare
Crypt of the NecroDancer
Dead Island
DG2: Defense Grid 2
Don't Starve - Mega Pack
Dreamfall Chapters
Empire: Total War
Football Manager 2015
FTL: Faster Than Light - Advanced Edition
Geometry Wars 3: Dimensions
Goat Simulator
GRID Autosport
Hotline Miami 2: Wrong Number
Kerbal Space Program
Metro: Last Light Redux
Metro 2033 Redux
Middle-Earth: Shadow of Mordor
Payday 2
Planetary Annihilation
Saints Row IV
Sid Meier's Civilization V
Sid Meier's Civilization: Beyond Earth
Space Hulk Ascension
Strike Suit Zero
The Talos Principle
This War of Mine
Torchlight II
Transistor
Tropico 5
Wargame: Airland Battle
Wargame: European Escalation
Wargame: Red Dragon
Wasteland 2
The Witcher II: Assassins of Kings - Enhanced Edition
The Witcher III: Wild Hunt
XCOM: Enemy Unknown
Ziggurat

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