My top 50 and the platforms on which I played them:
50. Mercenaries: Playground of Destruction (PS2)
49. BioShock (X360, PS3)
48. Star Fox (SNES)
47. Portal (X360)
46. Braid (X360)
45. The Legend of Zelda: A Link to the Past (SNES)
44. Ultima VI: The False Prophet (PC)
43. Gears of War 2 (X360)
42. Bahamut Lagoon (SNES)
41. Star Wars: Knights of the Old Republic (PC)
40. Bully: Scholarship Edition (X360)
39. Metal Gear Solid: Peace Walker (PSP)
38. Ys III: Wanderers from Ys (SNES)
37. Vanguard Bandits (PS1)
36. Harvest Moon: Friends of Mineral Town (GBA)
35. Doom (PC)
34. Pokemon Ruby (GBA)
33. Valkyria Chronicles (PS3)
32. Star Wars: Battlefront (PS2)
31. Mass Effect (Xbox 360)
30. Pac-Man Championship Edition DX (PSN)
29. Uncharted 2: Among Thieves (PS3)
28. Batman: Arkham Asylum (PS3)
27. Final Fantasy X (PS2)
26. Knights of the Round (SNES)
25. Rome: Total War (PC)
24. Chrono Cross (PS1)
23. Secret of Mana (SNES)
22. Red Dead Redemption (PS3)
21. Super Mario Kart (SNES)
20. Silent Hill 2 (PS2)
19. Katamari Damacy (PS2)
18. Medieval II: Total War (PC)
17. Mass Effect 2 (PS3)
16. Bushido Blade (PS1)
15. Chrono Trigger (SNES)
14. Final Fantasy IX (PS1)
13. Red Seeds Profile, a.k.a. Deadly Premonition (PS3)
12. Earth Defense Force 2017 (X360)
11. Dead Rising (X360)
10. Fallout 3 (X360, PS3)
9. Yakuza 3 (PS3)
8. Age of Empires III (PC)
7. Rez (DC, XBLA)
6. Earthbound (SNES)
5. Front Mission (DS)
4. Castlevania: Symphony of the Night (PS1, XBLA)
3. Flower (PSN)
2. Final Fantasy IV (SNES)
1. Final Fantasy VI (SNES)