Find the Circle... Quickly!
In this game, your task is to click on the patch that shows a circle. This is simple enough when only one color is involved, but when the circle is hidden amongst a red-green background it can be very difficult. Believe it or not, having trichromatic (full color) vision isn't always advantageous. In situations where there is a LOT of color interference, it might be easier to find what you are looking for in dichromatic conditions - essentially filtering out some of the color "noise".