1 in 12 people are colourblind, that's 8% of the global population. That's 3 million people in Britain alone. The red X on treasure maps is entirely invisible to most of us, especially when it intersects with grass. Please change to colour of the X to something other than red. Black would be the most visible. Or perhaps outline it or make if flash. Red is literally the worst possible choice for tens of millions of people worldwide.
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