- Oralbums - Boucle d'or
- Oralbums - La Moufle
- Orange Alert
- Orange Tree
- Orbit Arcadia
- Orbits™
- Orboot Earth AR by PlayShifu
- Orbu: AR Puzzler
- Orbz
- Orca Paradise: Wild Friends
- Orca Puzzles for Kids Free Jigsaw Wonder Edition
- Orchard Toys
- Ordenar las sílabas
- Ordne Die Bunten Bälle
- Orikon Battle Mobile
- Orisinal Casanova
- Orthographe CE2
- Orthographe CM2
- Ortografía Paso a Paso
- Ortografía Paso a Paso School
- Osipostales
- Osmo ABCs
- Osmo Coding Jam
- Osmo Costume Party
- Osmo Counting Town
- Osmo Detective Agency
- Osmo Hot Wheels™ MindRacers
- Osmo Lettertopia
- Osmo Masterpiece
- Osmo Math Buzz
- Osmo Math Wizard
- Osmo Numbers
- Osmo Numbers Classic
- Osmo Numbers Toybox
- Osmo Pizza Co.
- Osmo Shape Builder
- Osmo Squiggle Magic
- Osmo Stories
- Osmo Tangram
- Ostwind
- OtaQuiz
- Black and white board games
- Othello Quest - Online Othello
- Othello swap it.
- Fairy Tales : Hidden Objects
- Other Words
- Otsimo | Special Education 1+
- Otsimo | Speech Therapy SLP
- Otter Friends
- Otter Ocean - Scavenger Hunt
- Otti
- Our Dolphin Rescue Show
- Our Treasure Hunt
- Our Ways
- Ouroboros: Infinity puzzle
- Outburst - Catch Phrase Game
- Outfolded
- Outloud Citymals
- OutOfTime!
- Over The Bridge
- Over the Sea : Lite
- Owl Floral Coloring Book For Adult Relaxation Game
- Owl Memory Match
- OX Fun
- Oxygen Tanker Truck
- OZ - With a Wizard and 3 Kings