Exercise your brain and Crack the Safe. it is a well known fact that our brain, just like any other muscle in our body, needs to be trained and stay in shape. Crack the Safe is a fun easy cognitive brain training app created just for that. it is basically just an another version of the classic Bulls and Cows game. in the safe : bulls will indicate as a green light and cows as a yellow light. (in your log feature - bulls/green equal to O and Cows/yellow to X.) improve your time and score and most important thing - keep your brain young and active. general instructions : The safe has a secret code with 4 digits. The digits must be all different. A timer will start when you first click on the safe's keypad. Enter your number and watch the results. If the entered digits are in their right positions as the safe's code , they are "bulls" (Green Light or 'O') if in different positions, they are "cows" (Yellow Light or 'X') Improve your skills by reducing the number of rounds (or time) to crack the safe. Example: • Safe's Secret number: 4253 • Your try: 1234 • The safe will return : 1 Green and 2 Yellows. (The green relates to "2", the yellows relate to "3" and "4".)