I really enjoyed building this model but you really have to take your time and make certain everything fits perfect. I slightly broke three pieces but managed to fix them. With many of these Rokr puzzles I actually use Gorilla clear cyanoacrylate glue to keep the pieces firmly attached. When it finally came time to test the marble run I found I had to make a few tweaks to get everything running smoothly. The design and engineering in these is amazing. Quite a few left over pieces though that weren't really a part of the puzzle. Not sure why.
I really enjoyed building this model but you really have to take your time and make certain everything fits perfect. I slightly broke three pieces but managed to fix them. With many of these Rokr puzzles I actually use Gorilla clear cyanoacrylate glue to keep the pieces firmly attached. When it finally came time to test the marble run I found I had to make a few tweaks to get everything running smoothly. The design and engineering in these is amazing. Quite a few left over pieces though that weren't really a part of the puzzle. Not sure why.