Kahoot is a site where you can create and play games for any subject. If you want to create a game, you have to visit the site https://getkahoot.com/ but your students must visit the site https://kahoot.it/#/ to play the game. It's pretty simple and funny.
My students love it! I have just created a game to review with my second grade students what we studied in the first semester. I hope you can use it.
https://play.kahoot.it/#/lobby?quizId=81b4926f-8eca-4b1c-b7df-f3b498e515c4
