Inspired by the professional Farnsworth-Munsell test. Tap two tiles to swap them until the row forms a smooth color gradient between the two fixed endpoints.
The Farnsworth-Munsell 100 Hue Test is a professional color-vision assessment used by ophthalmologists and in design/photography fields to quantify color discrimination ability, not just detect red-green color blindness like the Ishihara plates.
Compare with the Color Blindness Test or try Color IQ Test.