Many of these puzzles will take a while to solve. You will find yourself looking and re-looking at them numerous times to see if you might have missed something. They are all solvable, but most will take a while and they range from fairly easy to crazy.
This is a fun book if you like to challenge your brain or your friends. Give it a try and see how many you can solve. Click the link below to read more about Bend Your Brain or to purchase it.