Or maybe it had to compete with the release of Chrono Trigger, Gundam VS Gundam, Animal Crossing and others =P
[spoiler]
01. [WII] Animal Crossing: City Folk (Nintendo) 305,180 / NEW
02. [NDS] Chrono Trigger DS (Square Enix) 270,868 / NEW
03. [PSP] Gundam vs. Gundam (Namco Bandai) 266,932 / NEW
04. [360] The Last Remnant (Square Enix) 101,543 / NEW
05. [NDS] Soccer Tsuku DS: Touch & Direct (SEGA) 71,661 / NEW
06. [NDS] Hoshi no Kirby: Ultra Super Deluxe (Nintendo) 55,470 / 418,000
07. [NDS] Wagamama Fashion Girls Mode (Nintendo) 25,275 / 209,000
08. [NDS] Rhythm Tengoku Gold (Nintendo) 24,731 / 1,184,000
09. [NDS] Pokémon Platinum (Pokémon) 24,173 / 1,941,000
10. [PS3] Way of the Samurai 3 (Spike) 19,641 / 100,000
11. [WII] Wii Fit (Nintendo)
12. [NDS] Tongari Boushi to Mahou no 365 Nichi (Konami)
13. [PSP] Prinny (Nippon Ichi)
14. [PS3] Gran Turismo 5 Prologue Spec III (SCE)
15. [PS2] Nightmare Princess??? (Yeti)
16. [360] Otomedius Gorgeous (Konami)
17. [PSP] Monster Hunter Portable 2nd G (PSP the Best) (Capcom)
18. [NDS] Fushigi no Dungeon Fuurai no Shiren DS 2: Sabaku no Majou (SEGA)
19. [NDS] DS Nishimura Kyoutarou Suspense 2 Shintantei Series:… (Tecmo)
20. [NDS] Ryuusei no Rockman 3: Black Ace (Capcom)
21. [WII] Mario Kart Wii (Nintendo)
22. [WII] Wii Music (Nintendo)
23. [PS3] Rachet & Clank: Maru Hi Ignition (SCE)
24. [PS3] Grand Theft Auto IV (Capcom)
25. [PS2] The Shield of AIGIS (Alchemist)
26. [PS3] Resistance 2 (SCE)
27. [PS2] Hitman Reborn: Forbidden… (Marvelous)
28. [WII] Family Ski World Ski & Snowboard (Namco Bandai)
29. [NDS] Animal Crossing: Wild World (Nintendo)
30. [NDS] Personal Trainer: Walking (Nintendo)
31. [PS3] Motorstorm: Pacific Rift (SCE)
32. [PS3] Mercenaries 2: World in Flames (Electronic Arts)
33. [NDS] Ryuusei no Rockman 3: Red Joker (Capcom)
34. [WII] Wii Sports (Nintendo)
35. [WII] Hitman Reborn: Forbidden… (Marvelous)
36. [NDS] Inazuma Eleven (Level 5)
37. [NDS] Valkyrie Profile: Toga o Seoumono (Square Enix)
38. [WII] Shape Boxing: Wii de Enjoy! Diet (Rocket Company)
39. [PS3] LittleBigPlanet (SCE)
40. [PSP] Yuusha no Kuse ni Namaikida Or 2 (SCE)
41. [NDS] Quiz Magic Academy (Konami)
42. [WII] Wii Play (Nintendo)
43. [PS2] Shin Sangoku Musou 5 Special (KOEI)
44. [NDS] Mario Kart DS (Nintendo)
45. [360] Mercenaries 2: World in Flames (Electronic Arts)
46. [NDS] Taiko Drum Master 2: The Seven Island Adventure (Namco Bandai)
47. [NDS] Daigasso! Band Brothers DX (Nintendo)
48. [PS3] FIFA 09 (Electronic Arts)
49. [NDS] Beautiful Letter Training (Nintendo)
50. [NDS]
http://Cid to Chocobo no Fushigi na ...e no Meikyuu + (Square Enix)
[/spoiler]