Krypto is a card game that is designed for a small group. This lesson is how I adapted the game into a full class activity - creating a generation full of Kryptomaniacs! I believe it could be used from elementary school through high school.
Note: This game requires a double deck of the game Krypto which may be found here: http://mphgames.net/. They cost $8.50 a deck and are well worth the investment. I used mine for over 15 years.