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Bulls and Cows is a deduction game where you need to discover the secret code.
For each guess, you'll receive hints.
The ✓ hints are called Bulls. For each Bull (✓) that you received as hint, it means a correct digit for a determined colour/shape and position.
The X hints are called Cows. For each Cow (X) that you received as hint, it means a correct digit for a determined colour/shape, but which was guesses in the wrong position.
If you receive a hint with the symbol ∅, it means that you guess an invalid colour/shape that is not part of the secret code.
The order of the hints don't mean the correspondent digit.
Eg: For the secret code 1356. If you guess 5126, you could receive the hints ✓XX∅ which means you have 1 Bull (✓) for 1 single correct colour/shape and position. 2 Cows (X) for 2 correct colours/shapes, but both in the wrong position each, and, 1 incorrect colour/shape that shouldn't be in the secret code.