Interediate/advance games

http://www.eslgamesplus.com/intermediate-classroom-games/

Articles - Who wants to be a millionaire?

http://www.engames.eu/articles/articles_millionaire_game.html

Articles - Fling the Teacher game

http://www.engames.eu/articles/articles_fling_game.html

Articles - Penalty game
http://www.engames.eu/articles/articles_penalty_game.html

Articles/Nouns quiz

http://www.eslgamesplus.com/articles-nouns-quiz/

Billionaire Plurals

http://www.eslgamesworld.com/members/games/ClassroomGames/Billionaire/Plurals%20Billionair%20Game/index.html

Plural of nouns

 Exercises

http://www.myenglishpages.com/site_php_files/grammar-exercise-plural.php#.U4Jk-HJ_ssy

http://www.englisch-hilfen.de/en/exercises_list/substantiv.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=723
http://www.grammar-quizzes.com/agr_irregplurals.html
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/irrplu1.htm