From: Hoorn (NED).
There are also different kinds of color blindness. Generally speaking, if one uses colors and want to make sure the colorblind see them, one needs to know what to avoid.
I really gave Steve a thumbs up for designing this game with the colorblind in his mind. Since I started testing this game, I (being colorblind) had only a few things to remark on it regarding the colors used.
I used the default colors in Microsoft Paint until I found four that I could easily tell apart.
Blue, Gold, Dark Red, Lavender: 63/62/204, 255/201/14, 136/0/21, 200/191/231.
By the way, the color that Microsoft calls "dark red" does not look red at all to me.
Line width matters. Thicker lines are easier to see. Using the smallest line in paint, the lavender did not stand out well; using the next larger size line worked fine.
To my surprise, a thin yellow line was very hard to see against a white background. This caused me to reject yellow.
Black and white are of course distinguishable. White, though, has a problem -- white on white might just be a little hard to see!
Graphics changed (i.e., line colors changed) consistent with these RGB values. Better?