Each month I post a free music game on the Play With Sound website. This is in addition to the other free music games on the site that have proved so useful in schools, drama workshops. December's Game of the Month is suitable for adults and children over nine.
Called Telephone it has a communication theme but is really about developing fluency with three simple rhythmic motifs. The fun bit is using these to contact other players. In order to do that one must develop the skill of of hearing and reproducing the motifs accurately.
Telephone will develop rhythmic, listening, communication and improvising skills. The rhythms can be clapped or played on instruments. Let me know how you get on.