Kuku Kube is a game of perception. All you have to do is select the square that’s a different shade from all the others. It starts easy, of course, and becomes more difficult as you go along. And yeah, you will be timed. The highest score I got was a 30, but I might have done better with my glasses on. -via Buzzfeed
I rarely notice any effects of this "deficiency". I suspect it ain't deficient, just different.