Kugellager 7 came quite highly recommended by my mate Louis whose wife had surprised him with one as a Christmas present. I already had a copy of its smaller brother, so when Wil offered them for sale soon afterwards, I knew I had to add one to the collection.
Although the family resemblance is impossible to miss, it is the implementation between the two that differs slightly. Whereas the first one is true to its name and uses actual ball bearings [Kugellager = ball bearing] to move between the levels, the bigger brother opts for short screw studs (they look a bit like large rivets that screw together) but retains the family name, modified with a clue to the higher order of this version – 7 as opposed to 5 levels.
|Somewhere in the middle|
Working your way through the solution is pretty straight-forward, if not a bit hypnotic and it definitely has an element of therapy in it. Moving the slider in and out while alternately tilting the puzzle forward and back to allow the pieces to move up and down between levels becomes almost second nature after a while. It probably says a lot about my OCD that I can’t leave it half-done, and actually found wandering through and then back again, quite amusing – what still intrigues me is my total inability to tell from looking at the current position how far away from either the start or the end position a particular point is – often when I think I’m getting somewhere, attention will fairly quickly switch to something I wasn’t expecting and end up making me feel like I’m going in reverse – and yes, I know that’s possible, but I think I’m still heading in the right overall direction. Promise.
Addendum: Goetz has added a great page to his web-site that shows all of his n-ary puzzles over here.