An exciting construction set using the ever-popular Galt Marble Run to create fascinating chain reactions! Challenge yourself to build a chain of fun obstacles for your marbles. Watch your marble swirl around the vortex, send paddle wheels spinning, knock over dominoes and jump from drum to drum to raise the finish flag! Marble Run Reactions is a hands-on way to learn about cause and effect and introduces forces and energy. Build on top of the chain reaction ideas sheet, following the numbered images to build each tower and obstacle. Once you have mastered the marble run, mix up the pieces and have hours of fun constructing your own chain reactions! Marble Run Reactions is fully compatible with all Galt Marble Runs.