Halo 3: ODST had the type of UK launch one would expect from a Bungie Halo game. According to Chart Track, 64 percent of ODST's sales were recorded in the first 24 hours after launch last Tuesday, September 22, helping to rank the game twelfth on the list of all-time week one sell-throughs (for a single format). For context, Master Chief's previous outing, Halo 3, rocketed to the fourth highest first week sell-through upon its release, trailing only GTA: San Andreas for PS2, Grand Theft Auto IV for Xbox 360, and -- surprise, surprise -- GTA IV for PS3.
Professor Layton and Pandora's Box (the Diabolical Box in the States) premiered at the number two spot last week, with prior week's top performer, Need for Speed: Shift, tapping the brakes down to third.
Source -- Halo 3: ODST shines brightly at #1 (Chart Track) Source -- All formats chart (Chart Track)