Quizlet, the classic flashcard study site, recently released a beta version of "Quizlet Live," a multiplayer, cooperative/competitive review game for your classroom.
Just log in to your Quizlet account and search for a Study Set you're interested in using (or create your own). Select the Study Set, then click on the purple "Live" button in the top right.
Click on "Create Game" and it will give your class a pin number to sign in with at quizlet.live. Because of the way Quizlet groups students in the game, it requires at least 6 to play (2 teams of 3).
If you'd like to try a demo version where you can see multiple screens by yourself, you can try the Quizlet Live Demo to get an idea of how it works.
I can see this game becoming part of a rotation of review games like Kahoot!, Socrative's Space Race, Quizziz and Quizalize. It's one more good digital tool to keep handy in your teacher toolbox.