Starting right now, and running till next week, is the Xbox Ultimate Game Sale. For the next seven days, until March 4, 2013, one can save upwards of 75% on over 60 Xbox 360 Games on Demand titles.
The following is the entire selection. Though, as Major Nelson explains, not everything will be up for grabs at once. Sorry, but that would be too easy.
Instead, different sets of titles will be discounted each day. So if there's one particular game that you want, and it's not available at a deep discount right this second, you'll have to check Xbox Live every single day.
Or, you could take the Major's advice and follow him on Twitter, which is where he'll also announce the day's special offers. Anyhow, everything that will eventually offered:
Assassins Creed
Assassins Creed 2
Batman Arkham Asylum
Batman Arkham city
Bioshock
Borderlands
Borderlands 2
Brotherhood (Assassin’s Creed Brotherhood)
Call of Juarez
Call of Duty 2
Call of Duty 3
Call of Duty: Black Ops
Call of Duty: Black Ops 2
Call of Duty: Modern Warfare
Call of Duty: Modern Warfare 2
Call of Duty: Modern Warfare 3
Code Veronica
Dark Messiah of Might and Magic: Elements
Dead Island
Dirt 2
Dishonored
El Shaddai Ascension of the Metatron
Fable III
Fallout 3
Fallout 3 New Vegas
GRID
Halo 3
Halo 4
Halo Reach
Halo Wars
Kane & Lynch Dead Men
Left for Dead 2
Max Payne 3
Metal Gear Solid HD
Metal Gear Solid Peacewalker
Mortal Kombat
Mortal Kombat vs. DCU
Orange Box
Portal 2
Raccoon City
Rainbow Six Vegas
Rayman Raving Rabbids
Resident Evil 4
Resident Evil 5
Resident Evil 6
Red Dead Redemption
Revelations (Assassin’s Creed Revelations)
Sid Meier’s Civilization Revolution
Street Fighter IV
Street Fighter X Tekken
Super Streetfighter IV Arcade Edition
TC’s H.A.W.X.
Tekken 6
Tekken Tag Tournament 2
The Darkness
The King of Fighters XIII
Tom Clancy’s Ghost Recon Advanced Warfighter
Tom Clancy’s Ghost Recon Advanced Warfighter 2
Tomb Raider Legend
Virtua Fighter 5
World at War (Call of Duty: World at War)