I see many teachers having success using Kahoot! Games as I walk through the building. I am excited to tell you about another similar website for you to try: Quizizz. Quizizz is a fun and competitive formative assessment game that has the look and feel of Kahoot!, but with a different approach.
I put together some information about the site: Quizizz Information
Or go to http://quizizz.com to give it a try.