Not as many as some, but enough to be significant:
Silent Hill - Original PS1 and PSN download
Silent Hill 2 - Original Xbox version, PS2 collector's edition, PS2 director's cut
Halo: Combat Evolved - Original Xbox, PC, Anniversary
Halo 2 - Standard Xbox and special collector's edition
Alan Wake - Xbox 360 standard and collector's edition
Metal Gear Solid 2 - Original Xbox version, PS2 standard, PS2 Substance and HD Re-release
Metal Gear Solid 3 - PS2 Standard, PS2 Subsistence, Snake Eater 3DS and HD Re-release
Skyrim - Xbox 360, PC
Oblivion - Xbox 360 standard, Xbox 360 complete edition, PC 10th anniversary edition
Shadow of the Colossus PS2 Standard, HD Re-release
The Longest Journey: Dreamfall Xbox originals, PC special edition, GOG download
Portal 2 - PC and PS3
Arfonious said:
Lord of the rings battle for middle earth twice
I made the mistake of trading my copy in... then I remembered that it's the most amazing game ever and realised my mistake. It's the only RTS I've ever truly enjoyed.