Not only is it fun and addictive, there are times when it is so mind-boggling and frustrating that you will feel like pulling your hair out! It is not unusual to be stuck at a level for hours and then discover that the answer was too simple and very obvious!
For all those who wish to try, here is the link:
I am still stuck on Level 13! Any hints for cracking this level is welcome...And yes, if you get stuck on any of the previous levels, feel free to ask me! You won't get any direct answers but hints - definitely!