Coloruno

Coloruno is a free browser game about how hard it is to remember a colour exactly. Each round fills the card with a colour for about five seconds while a timer runs down; once it disappears you rebuild it with three tall sliders for hue, saturation and brightness, then confirm. A perceptual colour difference model compares your guess with the target and turns the gap into a score out of 10, for a total out of 50 across five colours.

Play Today's Challenge opens a card with the date and a countdown to the next puzzle. Everyone gets the same five colours that day, and the scores go on a daily leaderboard. You play as a guest with a display name saved in your browser; no account is needed.

The home screen has three tabs. Color Memory is the classic game, with the daily, unlimited solo practice and multiplayer challenge links for friends. Color Toon has themed matches where you recreate a missing colour on a cartoon or anime character, a Pokémon, a country flag or a brand logo, with its own Daily Mix. Color Rush is a 60 second test of the eye: tap the one tile in a slightly different shade, with a shared daily run and unlimited practice.

The site is free and carries Playwire ads. On a phone a short ad screen comes before the daily rounds, and the desktop page can carry a full-page ad skin. It suits anyone who likes quick perception tests, and designers who want to check their eye.