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WELL DESIGNED CONTRAPTIONS: Unlike other Rube-Goldberg type toy contraptions, our KEVA Playset employs snugly, fitting non-warped pieces that don't have breaksYoung thinkers can build unbelievable ball track structures with this simple stacking plank system. Create ramps, funnels, chutes and crazy contraptions Building Contraptions creates one problem after another … yes, problems are good. Problem: The ball won't move. Solution: Place the ball on a sloped plank.