- What is it? - Quiz Game
- Occi-Expert
- Occupation Flash Cards English Vocabulary For Kids
- Odd One Out Zebra Free
- Off Limits! Word Guess
- Officiel du SCRABBLE®
- OgStar Reading Complete
- OgStar Reading Early
- OgStar Syllables & Beyond
- Ogura Hyakunin Isshu Quiz
- Oh My Eyes!
- Ojibwe Game
- Old man's eggs
- Old School Hangman
- Olympic Math-Second Grade
- OMBY
- Nicht Lachen Challenge
- OMJ - Oh My Jokes
- Omni Crosswords
- Omnigrams
- On Your Head
- On-Core Wordfind
- One Brain – Elevate Your Mind
- One Clue Crossword
- One Drive RC Car Game
- One Minute Brain Builder
- One Touch Drawing - Connect Dots Puzzle
- Onletters
- Online Hangman Word Game
- Online Mixed Words
- Only 3 Words
- Open One Photo
- Opposites Adventure
- Orange Genius
- Orca and marine mammals
- Ord i fokus
- Ord.
- Ordenar las letras
- Ordenar las sílabas
- Ordet Lite: Five Levels from the Word Game
- Ordet: Everyone’s Favorite, Little Word Game
- Ordkjeder
- Ordleg
- Ordlek XL
- Oriel Llythrennau Unigol
- Original Hangman
- Oriel Llythrennau Unigol
- Original Hangman
- Orijinz
- Ortografía Paso a Paso
- Ortografía Paso a Paso School
- Orðagull
- Orðaleikurinn
- Oscar Winners Trivia
- Osmanlı Eğitici Tarih Oyunu
- Osmanlıca Kelime Oyunu
- Osmo ABCs
- Osmo Lettertopia
- Osmo Squiggle Magic
- Osmo Words
- Osmo Words Classic
- Other Words
- Out of Ink - Drawing Game
- Outburst - Catch Phrase Game
- OutOfTime!
- Ouvrir une photo
- Owls and Vowels: Word Game
- Oz Phonics 1