I'll count Visual Novels
January
Tales of VS.
February
Sharin no Kuni, Himawari no Shoujo
March
Saya no Uta
April
Ghost Trick Phantom Detective
May
-
June
Donkey Kong Country 3 Advance
Hoggy
Portal 2
VVVVVV
Sharin no Kuni, Yuukyuu no Shounenshoujo (PC)
July
Bomberman Hero
August
Bleach: Dark Souls
Grief Syndrome
September
Cross+Channel
Angry Birds
October
Narcissu
November
Kingdom Hearts: Birth By Sleep
Crescendo -Eien Dato Omotte Ita Ano Koro-
G-senjou no Maou
December
Umineko no Naku Koro ni Chiru
Fire Emblem: Blazing Sword
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Good job SuperNiceDog