Great fun, good challenge, but poorly working design. Marble explorer doesn't gain enough speed to reach the firing point. Being a very mechanical person cannot help overcome bad design. So you spend hours (about 30) on a flawless assembly of parts and end up with a cool gadget. then it doesn't work. This is very disappointing in the end. I would like to add that I was able to change the design and it works fine. However, I see that many people give up at some point. I took a two week break and decided to make it work. Here, just a few simple design changes with no difference in cost make this item really impressive. Call me for a Rokr solution.
ROBOTIME 3D DIY Solar Car Puzzle Kit - Fun Arts and Crafts for Teens and Adults - Top Learning Toy and Birthday Gift (Curiosity Rover)
25 Review
ROBOTIME 3D Wooden Puzzle Mechanical Gear Clock Owl Model Kit For Teens & Adults - DIY Building Set
36 Review
Robotime 3D Wooden Craft Kit: Brain Teaser Games Mechanical Gears Set With Cog Coaster And Steel Balls - Best Building Toys For Kids
47 Review
Get Ahead With Vdealen'S 8-Pack Of Exceptional Speed Cubes! Ideal Gift For Teens, Kids, And Adults On Christmas And Birthdays!
24 Review
Mudpuppy Magical Friends 4-In-A-Box Puzzles, Ages 2-5, Each Measures 6”X8 - Chunky Puzzles With 4, 6, 9 And 12 Pieces - Difficulty Level Grows With Child – Beautifully Illustrated Puzzles, Multicolor
16 Review
Dinosaur Puzzle Wooden Jigsaw Puzzles For Kids Ages 3-12, 60 Pieces 2 Pack Boys Girls Gift
23 Review
BeginAgain Butterfly A To Z Puzzle - Educational Wooden Alphabet Puzzle - Kids 2 And Up
12 Review
100-Piece Under The Sea Glow-In-The-Dark Puzzle For Kids Age 5+ - Colorful Illustrations Of Underwater Fish, Plants, And Sea Creatures - Award-Winning And Perfect For Learning And Play
12 Review