Those guide-a-ball-through-a-maze puzzles seem to be getting harder and harder.
One that I have tried is Maze Cube, which gives 699,840 different mazes to try, and I have managed quite a few !!
These ball mazes need a very steady hand as well as lots of patience and many tries. Some beat me, though not my son.
I have recently gotten the Addict-A-Ball Maze puzzle and it is good.
It involves moving a little silver ball through a brightly coloured maze of spirals, arches and holes which may sound simple enough but is much tougher than it might seem. You'll need skill and patience to complete this near-impossible challenge, as well as the self-control not to throw it out of the window when it beats you. It really is addictive but is so much fun and needs no batteries - even your pets will love playing with it.