Secret Code Deduction

Deduce · Puzzle & Thinky on ArcadeOwl

How to play

Build a four-colour guess from the palette.

Press Check to score it.

A black peg means a colour is right and in the right place.

A white peg means a right colour in the wrong place.

Why you'll love it

✦ Classic Mastermind deduction

✦ Clear black/white peg feedback

✦ Fewest-guesses scoring

Play now — free

No download. No sign-up. Just play in your browser.