The review game includes little cards that can be used at the end of the unit as well. I printed mine on pretty color cardstock and laminated them. At the end of the unit, have the class sit in a circle with the teacher in the middle with a timer. The students will have a sheet of paper on a clipboard. They will number their paper from 1-21 and will each start with one card. When the teacher says go, they will record the answer to the question on their sheet. After about 15-20 seconds, the teacher will have the student pass their card to the next student. When the cards have made it all the way around, the teacher will go over the answers to make sure the students are on the right track. This is used best when the review is done the day before the test!