DUOLOCK

DUOLOCK is the third daily puzzle from Fun Thinking Limited, the small family team behind the number game Padlock and the word game Alphalock. It takes their Mastermind-style feedback and adds a second hidden answer, so every guess you type goes on two boards at once and is scored separately on each.

The home page is Four Letter DUOLOCK: two hidden four-letter words and 12 goes to find both. After each guess, four mini blocks beside each board turn green for a letter in the right place, yellow for a letter in the answer but elsewhere, and grey for the rest. The blocks do not say which letter they refer to, so the work is in reasoning out which letters earned them, across both boards at once.

Two number modes run on the same day's clock. Four Digit DUOLOCK hides two four-digit codes with the same mini-block counts and 12 goes. Basic Four Digit DUOLOCK is the gentler version: 6 goes, and the digits themselves change colour, as in Padlock.

The puzzles are numbered from 1 May 2024 and the same for every player. A settings switch picks whether the next game starts at midnight UTC or at your local midnight, and there are light, dark and high-contrast themes, statistics with a streak, and a shareable result. The game has no ads and no sign-up; a heart button leads to optional donations. It suits players who like Mastermind and bulls-and-cows deduction more than Wordle's direct colour hints.