Help the children listen better by giving away some of the questions you will ask during the review game. Be very specific:
"I'm going to ask you what country Naaman came from, what the king of Israel thought Naaman had come to do that made him so upset, why Naaman became furious, and why Elisha didn't accept anything from him."
The children should be able to focus on the lesson better if they are motivated to listen for certain things. Just be sure not to give away too much of the Bible lesson by the questions you give them.