About 5-10% of males have some form of colorblindness. What's the best way to ensure you are not turning away 5-10% of your male population from your game?
Just to note colorblindness does not mean people see in black and white. It usually means they see less green and get red/green confused easily. Colorblindness comes in degrees. Some forms are mild some are extreme.
Answer
Don't make game critical functions or gameplay based off of the colors that might confuse players.
Let's consider a game like Bejeweled. Let's say that a color blind person can not determine the difference in the red or green gems. They are going to have a lot trouble swapping gems if they can't determine what color a gem is.
You could fix a problem like this by including a second way to differentiate between the red and green gems. One example would be to give them different shapes, such that each color has its own unique shape.
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