- O & X for Watch
- O & X: Noughts and Crosses
- O Dever Me Chama
- O Diário de Mika
- The Amazing Circus
- O is for Obliteration
- O Jardim da Silvana
- O Luga O Le Motu
- O Mundo de Augusto
- O papagaio que não sabia falar
- What is it? - Quiz Game
- O Show da Luna! Vamos Colorir
- O stříbrném pírku
- O X Master
- O X Multi
- O$P$ (Owe Money Pay Money)
- Object X
- Objectifs : Jeu de Cartes
- Objects Learning Game
- Objects order: memory game
- Oblivion – The Black Hole – Mission Oblivion
- Observa
- Obsession
- Obstacle Ball pool
- Obstacle Course Car Parking
- Obstacle Of Monkey
- OC Penguin
- Occi-Expert
- Occidental Heroes
- Occult Crime Police
- Occult: Creepy Interrogation