have to be honest w/h u Jos. At first i thought it was a common level, but then i found challenging pauloalex solution in 22 moves and still trying to find this pattern. Overall and IMO the good rating lies with pauloalex's contribution. Nice idea though, as you may end up - pretty easily - in an unsolvable position even with walls... And finally got that...very very cunning solution pauloalex and Jos of course for the creation.