Spectra

Spectra applies the Wordle format to colour, but it is a logic puzzle rather than a test of your eye. The hidden colour is built from three digits, one each for red, green and blue, so there are a thousand possible colours. You pick a value from 0 to 9 for each channel with small up and down buttons, see the colour you made beside the mystery colour, and press Guess.

Each channel then reports back on its own. Green means the digit is exact, yellow means it is within two, and grey means it is further off, and an arrow tells you whether the secret value is higher or lower. With careful guesses the three channels can be solved independently, so anyone can finish without a good colour sense.

A new colour arrives at midnight UTC, the same for everyone, and the game counts the days. When you solve it you get a spoiler-free emoji grid to share. Your streak and stats stay in your own browser, and after the daily an unlimited practice mode deals more colours. The game has no account and no ads, and it counts visits anonymously. its maker, Atlas, also runs Vaultle, a daily code-cracking game, and offers both games as a starter kit for building your own daily puzzle.