Kahoot

Check out Kahoot, a game-based tool that students use to answer questions online.  Ms. Fulks 6th grade students recently used this tool.  I noticed how her students were engaged and excited as they were reviewing Spanish colors.
Teachers will go to https://getkahoot.com/ to setup an account.  Students will go to https://kahoot.it/#/ and enter the game pin.
Don't worry about creating your own Kahoot, there are many already created for you to try with your students.