Marble Rush - interactive marble run. Marble Rush interactive marble run extension set - Lights&Sounds rocket extension with 2 components, 1 sound and light module (electronic) and 3 MarBalls (marbles). The rocket (electronic sound & light module) reacts with funny sounds and light effects when the balls roll through it, plus it plays cool music while playing. Building and playing with the marble run encourages motor skills, creativity, spatial thinking and an understanding of the principle of cause and effect. Compatible with all Marble Rush sets to build huge marble run worlds. Childproof battery compartment and automatic switch-off. Demo batteries are included.