Oto o Tsunagou! Gunpey Reverse (J)(Legacy)
Othello de Othello DS (J)(NEET)
Osu! Tatakae! Ouendan! (J)(ProjectG)
Oshiri Kajiri Mushi no Rhythm Lesson DS - Kawai Ongaku Kyoushitsu Kanshuu (J)(Independent)
Oshare Princess DS - Oshare ni Koishite! (J)(WRG)
Oshare Princess - Oshare ni Koishite 2 (JP)(BAHAMUT)
Oshare ni Koi Shite 2 Plus (JP)
Oshare Majo - Love and Berry (J)(WRG)
Oshaberi Oumu (JP)(High Road)
Oscar the Balloonist - Animalistic Adventures (E)
Osawari Tantei - Ozawa Rina (J)(SCZ)
Original Story from Fairy Tail - Gekitotsu! Kardia Daiseidou (J)
Original Frisbee Disc Sports - Ultimate & Golf (U)(EXiMiUS)
Original Frisbee Disc Sports - Ultimate & Golf (E)(sUppLeX)
Orient Quest (E)(G)(PUSSYCAT)
Ore no Sentoki (J)(SCZ)
Ore ga Omae o Mamoru (JP)(Caravan)
Orcs & Elves (U)(XenoPhobia)
Orcs & Elves (E)(sUppLeX)
Operation - Vietnam (U)(XenoPhobia)
Consolas
