The Musical Fireflies are digital rhythm toys that introduce mathematical concepts in music such as beat, accent, mono- and polyrhythm without requiring users to have any prior knowledge of music theory or instruction. Through simple controls, the Fireflies allow users to input rhythmical patterns and embellish them in real time. The toys' wireless communication system allows players to synchronize these patterns and trade instrument sounds with other players. Since this interaction increases the richness and complexity of the game, the Fireflies also motivate collaboration and social play.