I assembled it with my son in half a day. It takes 3-4 hours or more. He likes it. Here are my concerns: #1 - In step 1 you need to assemble C5, C7, C6 and C8 in the order listed. WHY? I didn't understand it, so later I had to disassemble the puzzle to fix it. Everything else is sequential. This is a bug that Roku needs to fix. #2 β Part A-7 is the corkscrew where the balls roll. I broke the bottom trying to reattach it. Used Gorilla Glue to fix the part. Smoothed out (didn't need sanding) and then reassembled properly. #3 - After completing the puzzle, the racks (part E10 assembled in steps 7-12) (6 of them) do not lift and do not lift easily due to friction. We didn't realize it right away and when trying to turn the crank the wooden pin (G10) broke off the auxiliary gear (D8) (installed in step 3). I glued D8 to D16 (big gear) which solved the problem. I decided to use a Q-tip to apply WD-40 to the underside of the "E10 part" (the assembled parts are called parts d, e, f, g, h, i - 6 of them) where they slide over the top edge of the wheels (D15) for relief slip. It worked! This is a very creative puzzle and my son loves it. It was more work than it should have been, but that's ok. I left this review to help others avoid these problems.
Colorful Venice 1000 Piece Jigsaw Puzzle By Colorcraft
20 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
1000 Piece Animal Puzzle Color Challenge Round Mandala Cat Jigsaw Puzzle - Bgraamiens Puzzles Mandala Cat Edition
14 Review
Explore The Arctic With Mudpuppy'S Colorful 64 Piece Puzzle For Kids - Find 40+ Hidden Images Of Animals, Fish, And Birds Living In The Arctic!
25 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
Engage Your Child'S Curiosity With The 5 In 1 STEM Kit - The Perfect Educational Building Toy For 8-12 Year Old Boys And Girls
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
ROBOTIME 3D Wooden Puzzle Mechanical Gear Clock Owl Model Kit For Teens & Adults - DIY Building Set
36 Review