Max: The Curse of Brotherhood and Styx: Master of Shadows are among the Xbox One deals, while GTA: San Andreas, GTA IV, and GTA V are among Xbox 360’s.
Joining Max and Styx are Zoo Tycoon and Forza Motorsport 5: Racing GOTY Edition on Xbox One.
On Xbox 360, GTA IV’s Lost & Damned DLC and Ballad of Gay Tony are also both 75 percent off. The Grand Theft Auto group are joined by Forza Motorsport 4’s season pass.
As usual, these discounts only apply to Xbox Live Gold members, and are valid only through January 12.
Source: Major Nelson blog