Schloss is German and means lock! Concentration and endurance are required to solve this puzzle. It requires a minimum of 250 steps to open it. To do so you need to slide the pins in the right positions. The solution is relatively simple once you get it, but quite time consuming.
image/text credit: Mr.Puzzle
The Lock 250 is a nice and different take on both the trick/puzzle lock as well as the n-ary puzzle. Great concept except my own copy has been let down a bit by the execution; ie the less than efficient sliding mechanism which make for some rather tiring (and frustrating) puzzling.
Not the usual trick lock in the traditional sense but rather a “n-ary” puzzle shaped like a giant pad-lock.Object is to open the shackle and to do this, all the 4 sliders must be moved left and right to end up all on the left side.
It takes 250 moves to open and hence a further 250 to close. Does take a while to just open the lock. The bottom slider is the main one that facilitates the moving of the other 3 sliders above it.