Marble Explorer Swingback Wall Marble Run MR-3 3D Wooden Puzzle

 Marble Explorer Swingback Wall Marble Run is based on great human engineering. The design of this mechanical gears 3D wooden puzzle combines the beauty of science and machines, involving so many small gadgets. Build the marble run set and crank the handle, watch marbles run crazy down the slopes and twisting turns.

• SWING BACK RAILS: LG503 Marble Explorer is a handcrafted marble run set with a swing back-rail wall. Build it with 219 building pieces and 10 marbles.

• MANY GEAR GADGETS: Consists of a crane lifter as an elevator, swing back rails, 2 straight rails, 2 curve rails, and a flip-flop as a switch to drive marbles to 2 paths.

• STEM CONCEPTS: Learn principles of Science, Technology, Engineering, and Mathematics(STEM)

• HOBBY & GIFT: Precise laser cutting ensure you a fluent building experience. Also a great gift for family and friends.