Puzzle rules
Secret Coder
Deduce the hidden four-digit code from the guesses and feedback dots. A black dot marks a correct digit in the correct position; a white dot marks a correct digit in the wrong position. Dot order does not match digit order, and each code digit can be counted only once per guess.
How to solve
Complete rules
Goal: Deduce the hidden four-digit code. Rules: - Each guess receives feedback for the number of matching digit occurrences. - A black dot means one digit is correct and in the correct position. - A white dot means one remaining digit is correct but in the wrong position. - Feedback dots are not tied to specific positions and may appear in any order. - Each digit occurrence in the secret code may be matched only once per guess; an unmatched occurrence receives no dot.