The OptionsPlay UI is just great to work with! A suggestion: a good proportion (about one in seven) of the male population has trouble with red-green colour deficiency. The shade of both red and green on the OptionsPlay web app are about the same. Can you take the reds and greens in OptionsPlay and make them different shades of green and red such that a colour-deficient eye can see that (for example) the dark green is bullish, and the light red is bearish, or something like that? Alternatively, put a different pattern in the red and green colours.