Brilliant.  Well though-out and laid-out.  Pushes your brain, but the complexity ramps up nicely, and there are rule and puzzle solutions in the back if you must peak (I've only looked a couple times so far :-) )

The artwork is endearing too.  Ordered the follow-up and now I'm on a "wait puzzle books can be good?!" kick.  Not sure it will last but this book has my leisure time over all the hundreds of various games I own.