Some of the hex bugs get stuck in one of the vertical parts. The bugs need to have a good amount of battery life left in them to manage this course. But it has been well played with since purchasing as a Christmas gift.
Our children have other Nano Hexbug toys which they enjoy, and so, unfortunately we bought this without reading the reviews on here - please don't make the same mistake!
Others have mentioned that the bugs get stuck in the tubes after a while. Well, they were lucky - our bugs got stuck from the offset!
We tried 4 different bugs, and all of them could not make it around the track without getting stuck. We put them all in at the same time, and within approximately 20 seconds, they were all stuck in a tube somewhere. This is despite the track being assembled correctly.
The only way to free the trapped bugs is to tap the track or in some cases dismantle a section and shake the bug out. In short, not much fun at all.
There are definitely better toys to spend your money on. One to avoid, I'm afraid.
My boys love the normal Hexbugs so saved up for ages to buy this climbing Nano V2 set. What a disappointment, it is complete garbage. Bugs get stuck constantly and only have enough power to climb for a very short period after inserting brand new batteries. The tunnel sections fall apart for no reason and when trying to dismantle (which you need to do all the time to free trapped bugs), the tabs that clip into the joint sections snap off unavoidably. I advise sticking to the normal Hexbugs and avoid anything that claims to climb - great idea but execution is hopeless.
As many have said before I thought this would run like a well oiled machine bud sadly as I type this 1 bug is stuck again whilst climbing and sometimes when they drop down they dont drop into the funnel as supposed to....