IDEA: Add a settings option for color-blind players to easily distinguish between green and yellow, and blue and purple colour schemes used for players and map territories.
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Hi Jerod, this feature is planned in our dev queue. I'm very sorry we didn't add this sooner.
We'd add a setting for players to enable colour blind option on their device.
We'd post an image to this thread with the revised player and territory colours for feedback to ensure there is sufficient contrast between problematic colour combinations. –Lee@SMG
A decent short term partial solution would be to make the 4th, 5th, and 6th armies Purple, Green, and Orange (In that order). Orange, Red, and Green are all very similar for red-green color-blindness (the most common). The colors that you chose for yellow and green are identical.