Hueddle

About Hueddle — find the shade that breaks the pattern

Hueddle sharpens odd-one-out discrimination — the ability to spot the single tile whose shade breaks from its neighbours. As the grid tightens over twelve rounds, the odd tile grows ever closer to the rest, pushing your eye toward its true threshold. This is the same scanning skill that catches a mismatched pixel in a gradient, a banding artefact in an export, or the one swatch in a run that came off the press wrong.

Each round shows a field of near-identical shades with one impostor hidden among them. Tap the tile that differs; with every correct answer the difference shrinks, so the game keeps meeting you right at the edge of what you can see.

It measures your just-noticeable difference — the smallest color step you can reliably detect. Read about color difference and Delta-E, or browse all our Learn about color guides.