QUADLOCK: 1A2B Code Puzzle

One 1A2B guess can reveal clues to crack multiple codes. QUADLOCK turns the classic 1A2B number game, also known as Bulls and Cows, into a multi-lock logic puzzle. Instead of solving a single secret code, you will work on several safes at once. Enter one unique 4-digit guess and every locked safe responds. Read the clues, rule out impossible combinations, and crack every code before your queries run out. Easy to learn, satisfying to solve Each secret code contains four different digits. A means a digit is correct and in the right position. B means the digit is in the code but in the wrong position. A result of 2A1B, for example, means two digits are exactly right and one more digit belongs in a different place. Use each response to refine your next guess. Solve several number codes together Choose a 2-safe warm-up, take on the standard 4-safe challenge, or test your strategy against 8…