Up to 300 games on sale, with many at above 75% off (up to 90%). Sale ends 19 March.
Here's a list of the biggest discounts (courtesy of @bheesty on Reddit):
-90.0% Deadly Premonition: Director's Cut
-90.0% We are the Dwarves
-85.0% Alien Breed + Tower Assault
-85.0% World Rally Fever: Born on the Road
-85.0% AI War: Fleet Command
-85.0% Bionic Dues
-85.0% Carmageddon Max Pack
-85.0% Shattered Haven
-85.0% Spelunky
-85.0% AI War Collection
-80.0% Crusader Kings Complete
-80.0% Omerta: The Japanese Incentive
-80.0% Depths of Peril
-80.0% Aquaria
-80.0% Carmageddon 2: Carpocalypse Now
-80.0% Sacred 2 Gold
-80.0% The Last Federation
-80.0% Into the Stars
-80.0% The Last Federation Collection
-80.0% Starpoint Gemini 2
-80.0% Omerta: City of Gangsters Gold Edition
-80.0% Risen 2: Dark Waters Gold Edition
-80.0% Risen 3: Titan Lords - Complete Edition
-79.0% Cultures 1+2
-79.0% Dark Fall 3: Lost Souls
-76.0% Kyn
-76.0% Skyshine's BEDLAM Redux!
-75.0% Tropico Reloaded
-75.0% Europa Universalis
-75.0% Din's Curse: Demon War
-75.0% Panzer Elite Special Edition
-75.0% Patrician 1+2
-75.0% Port Royale
-75.0% Sea Dogs
-75.0% Delta Force
-75.0% Delta Force 2
-75.0% Master of Orion 1+2
-75.0% Puzzle Agent
-75.0% Railroad Tycoon 2 Platinum
-75.0% Age of Wonders
-75.0% Aliens versus Predator Classic 2000
-75.0% The Walking Dead: 400 Days
-75.0% Ultimate Body Blows
-75.0% Vampire: The Masquerade - Redemption
-75.0% Sid Meier's Civilization III Complete
-75.0% X-Com: Apocalypse
-75.0% X-Com: Enforcer
-75.0% X-Com: Interceptor
-75.0% X-COM: Terror from the Deep
-75.0% X-Com: UFO Defense
-75.0% Freedom Force
-75.0% Freedom Force vs. the 3rd Reich
-75.0% Hybrid Wars Season Pass
-75.0% Level22 Garys Misadventures
-75.0% Majesty 2 Collection
-75.0% Majesty Gold HD
-75.0% Europa Universalis: Rome Gold
-75.0% Hearts of Iron III
-75.0% Tropico 3 Gold Edition
-75.0% Spacechem
-75.0% Cultures: Northland + 8th Wonder of the World
-75.0% Europa Universalis II
-75.0% Din's Curse
-75.0% Drox Operative: Invasion of the Ancients
-75.0% Master of Orion 3
-75.0% Railroad Tycoon 3
-75.0% Risen
-75.0% Age of Wonders 2: The Wizard's Throne
-75.0% Age of Wonders: Shadow Magic
-75.0% Journey to the Center of the Earth
-75.0% Magrunner: Dark Pulse
-75.0% Saints Row 2
-75.0% Sherlock Holmes versus Jack the Ripper
-75.0% Sherlock Holmes: Nemesis - Remastered
-75.0% Sherlock Holmes: Secret of the Silver Earring
-75.0% Sherlock Holmes: The Awakened - Remastered
-75.0% Sid Meiers Pirates!
-75.0% Sid Meiers Railroads!
-75.0% Sniper Elite: Berlin 1945
-75.0% CivCity: Rome
-75.0% Hearts of Iron
-75.0% Conga Master
-75.0% Puzzle Agent 2
-75.0% Delta Force: Land Warrior
-75.0% Delta Force: Task Force Dagger
-75.0% Stealth Bastard Deluxe Complete Edition
-75.0% Deadlight: Director's Cut
-75.0% Hearts of Iron II: Complete
-75.0% Knights of Pen and Paper +1 Deluxier Edition
-75.0% Codename Panzers: Phase One
-75.0% Codename Panzers: Phase Two
-75.0% Europa Universalis III Complete
-75.0% Giana Sisters: Twisted Dreams
-75.0% Risen 3: Titan Lords
-75.0% Stealth Inc. 2: A Game of Clones Deluxe
-75.0% Ironclad Tactics Deluxe Edition
-75.0% TRI: Of Friendship and Madness
-75.0% Sheltered
-75.0% Delta Force Xtreme
-75.0% Delta Force: Black Hawk Down Platinum Pack
-75.0% 88 Heroes
-75.0% Carmageddon: Max Damage
-75.0% Cities in Motion
-75.0% Stealth Inc. 2: A Game of Clones
-75.0% The Escapists
-75.0% Craft The World
Are any of these at a historical best?