Mastermind
Pick a colour, then tap each slot. Submit guesses the row. ● next to a row = right colour in the right place; ○ = right colour in the wrong place. Lower guess count is a better score.
Leaderboard
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About
Mastermind, the classic code-breaking puzzle. The game picks a secret 4-peg code from a small palette of colours (repeats allowed). After every guess the board reveals how many pegs are the right colour in the right place, and how many are the right colour in the wrong place. Pure deduction — every game is winnable in well under the attempt budget if you triangulate carefully.
How to play
Pick a colour from the palette, then tap each slot to fill it. Submit guesses the row. ● next to a row = right colour in the right place; ○ = right colour in the wrong place. Score is the number of guesses used to crack the code; lower is better. Three difficulties tune the colour count and the attempt budget.