【實用解謎app】Code Number Pro - Bulls & Cows|最夯免費app

Code Number -- also known as Bulls and Cows -- is an old code-breaking paper and pencil game, predating the similar commercially-marketed board game Mastermind.

The rules are simple. You have to guess a 4-digit secret number. The digits must be all different. For each guess, the app gives the number of matches. If the matching digits are on their right positions, they are good if on different positions, they are regular.

Example:

* Secret number: 4271

* Your's try: 1234

* Answer: 1G / 2R. (The good is 2, the regular are 4 and 1)

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