Crack the Code to Unlock

This book contains 25 interesting 'Crack The Code' puzzles. You have to guess the code to unlock the lock. The lock has a 3-digit key, for which you will be given 5 hints. From the hints you have to guess the correct answer. It is not at all difficult, you may face difficulty solving the initial few exercises. However, later on it will be easy.To make it through the multitude of incredible mind-challenging puzzles, it takes a sharp and keen mind with focused attention. To stay sharp and focused, you also need mental exercise along with physical exercise. Therefore, I would recommend solving some brain teasers, which would make your mind to look for all the details.It is a fun exercise and you would definitely love doing it.