Wood Trick Spiral Marble Run 3D Wooden Puzzles for Adults to Build

NATURAL WOOD - Spiral Marble run model is made entirely of wood and requires no glue/toothpicks to be fully assembled. Put together 558 pieces and create a fascinating marble roller coaster! Comes with 9 metal marbles and an illustrated assembly guide. Dimensions: 13*12.7*12.4 in PERPETUAL MOVEMENT - To create this breathtaking marble run puzzle, we were inspired by a perpetual motion machine. There’s nothing to stop the marbles' journey! This roller coaster is equipped with an electric motor powered by 4 AA batteries, 1.5V. Batteries are not included in the kit INTERACTIVE DESIGN - Developed by professional engineers, this 3D puzzle for adults is well-thought-out and will fascinate all DIY lovers. A special «paw» puts the marbles on the start, then they jump on the steps and are spread on three connected tracks. Assemble it and watch non-stop movement magic! HIGH COMPLEXITY - This wooden assembly kit makes it a real challenge and is recommended for experienced DIY fans. Taking about 6-8 hours to assemble, this model kit for adults develops perseverance & fine motor skills ENTERTAINING SCIENCE - Curiosity forms the basis for our 3D puzzles for adults. Are you excited about complicated mechanical games? WoodTrick will immerse you in the world of physics and mechanics and show you what's inside PERFECT GIFT TO ALL - Our wooden models for adults to build are a nice choice for Christmas holidays, Father’s Day, Valentine’s, Back-to-School and others. Share the real engineering joooooooy of 3D puzzles with your beloved ones!