Website Review: improvencyclopedia.org
In short: Hundreds of games that performers use to sharpen their minds, but teachers can easily change to help students learn English. For example, in one game, people use flashlights to control where the performers go. Teachers might modify the game to say that students use flashlights to move two other students (who are reading a dialogue) around.
For students: There are lots of fun games on this site. You can play any of them in English (or your language) and have fun.
For teachers: As a homework assignment, you could ask students to choose a game and present it to the class. Most games have a small number of rules, so it’s a challenging, but not overwhelming descriptive task.