Code Breaker

Code Breaker hides a four-position code drawn at random from six colours, repeats allowed. Click colours to build a row, confirm it, and the game answers with filled dots for exact matches and empty ones for right colours in the wrong place. Ten tries; your score is the number of tries left when you crack it. The hint counting handles repeated colours correctly, which is where most versions of this puzzle go wrong. Free, no sign-up, plays right in the browser.