- Op Operation
- Op reis in de ruimte!
- Op safari naar Afrika met Dirkje - Juf Jannie leest voor
- Opacha-mda
- Opart
- Opdoku = Calcudoku + Mathdoku
- Open 100 Doors - Christmas!
- 密室逃亡100關
- 全部點亮
- Open Bigger Surprise Capsule
- Open Case Simulator
- Open Door - Escape Games
- Open Door Night
- Open Face Chinese Poker (OFC)
- Open Giant Surprise Puppycage!
- Open Gifts Simulator
- Open House Hidden Object Games
- Open House: Meet Friends
- 密室闖關:30個相同房間
- Open One Photo
- Open One Photo Plus
- Open Puzzle Box
- Open Road For King Puzzle
- Open Sorcery
- Open Test
- 經典25道門:越獄密室逃脫官方第二部
- 經典100道門:越獄密室逃脫官方第三部
- Open the Lock!
- Open the Way 3D
- Open Train Tycoon Deluxe
- Open World Delivery Simulator
- 開放世界-計程車司機模擬 3D 免費狂飆
- Open World Madout Mafia City
- Open World Rope Hero
- OpenD6 Toolkit
- 新鮮麵包師的開幕日
- OpeningTree - Chess Openings
- OpenLitterMap
- OpenSaury
- Open the door - fun games
- Opera Maker
- Operasyon ATAK
- Operasyon: ANKA
- Operate Now: Hospital
- 操作挖雪機起重機
- Operation Ares - A Revolution on Mars! Recruit Spies, Complete Missions, & Gain Independence
- Operation Calculus
- OPERATION DRACULA
- Operation Dracula X
- Operation February
- Operation Helix
- Operation Mindfall 2.0
- Operation Optics
- Operation Outbreak
- Operation Santa
- Operation Sky
- Operation Smoochy
- Operation wow HD
- Operation: New Earth
- Operation: Survive Runner 3D
- Operator service
- Operators - Math Exercises
- Operação Abaporu
- Opernice
- Ophidia
- Opi viittomaan
- Opinion Game
- OpinionGames: Atomausstieg
- OpinionGames: Gotthardsanierung (Archiv)
- Oportuno超越無限丸遊戲高清
- Opp Ball
- Oppa doll