English based online games: 

https://www.bbc.co.uk/bitesize/subjects/zv48q6f

https://www.topmarks.co.uk/english-games/7-11-years/spelling-and-grammar

https://www.spellzone.com/word_lists/games-368726.htm

https://www.spellingcity.com/spelling-games-vocabulary-games.html

https://www.teachit.co.uk/english/spelling-punctuation-and-grammar/spag-games