Make safe items and hazards distinguishable without color vision
The practical problem
Danger indicators that rely solely on red versus green fail for players who cannot reliably discriminate that color pair.
Implementation protocol
Combine color with shape, iconography and concise text, such as a triangle hazard and a circular energy target. Keep differences visible in a grayscale capture.
Worked scenario
A grayscale screenshot of a gameplay frame should reveal which symbols are unsafe without requiring the player to memorize a subtle color hue.
What could go wrong
Colorblind simulation does not substitute for actual user testing, but it reveals obvious dependence on hue.
Acceptance criteria
Also test reduced motion.
Source material and evidence boundaries
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