Cambridge offers free access to Games and Social Media content. You'll just have to choose the aimed level and start having fun.
The main site is http://www.cambridgeenglish.org/learning-english/games-social/
ESL Games Plus is another way of saying Classroom Games for Intermediate & Advanced English Learning, Teaching. Have fun practising English Grammar & Vocabulary (past tenses, present Perfect, future, adjectives and adverbs, gerunds & infinitive, articles and nouns, conditionals, modal verbs, confusing words...
https://www.eslgamesplus.com/intermediate-classroom-games/
Games to learn is a resource that language learners can use independently. The games are aimed at a relatively low level of English with pretty much all the content being around elementary level. A lot of the vocabulary content would probably even be more like introductory or pre-elementary level.
You could find: "the Hang Man", "Bubbles", "Phrase Making", "the Spelling Bee",... and a lot more.
https://www.gamestolearnenglish.com/
BBC Skillswise: Challenges, crosswords...
http://www.bbc.co.uk/skillswise/english/games
Mundo Primaria offers grammar, vocabulary, spelling and reading games.
http://www.mundoprimaria.com/juegos-de-ingles/juegos-para-aprender-ingles-5o-y-6o-primaria/
Cerebriti. Site with plenty of games in different languages.
https://www.cerebriti.com/juegos-de-idiomas/
Cristic. A great resource to work with kids
http://www.cristic.com/5o-y-6o-de-primaria/english/
The Electric Company. A great place where you can play, watch videos and so on.
http://pbskids.org/electriccompany/
Funbrain offers hundreds of games, books, comics, and videos that develop skills in math, reading, problem-solving and literacy.
ESL Games Plus offers interactive online games for learning and teaching English as a Second Language. Our learning games are mostly suitable for teaching ESL Kids and Teenagers. There are activities for teaching and practising English grammar, irregular verbs, vocabulary, sentences, listening and pronunciation skills. By playing those fun educational games, students learn English vocabulary, sentence structures, grammar, listening, pronunciation and phonics.
The site features these ESL Activities Online: ESL Classroom Games, Memory Games, Spelling Games, Sentence Games, Interactive Board Games, Hangman Games, Jeopardy, Wheel Games, Concentration Games, Matching Games, Car Racing Games, Pirate Games, Crocodile Games, Word Recognition Games, Mobile Games for iPad, iPhones and Android devices.
To review the irregular verbs you can also check this game selection Symbaloo.