This Munsell hue test is a fun challenge of one's color vision. I was nervous taking it and perhaps overly excited when I submitted my arrangements and received a perfect score.
That might be my proudest accomplishment since breaking 100 for the first time on Flight Control on the iPhone (at $0.99 for a limited time only, Flight Control is a steal).
Here is a YouTube video of someone breaking 10,000(!?!) on Flight Control which makes breaking 100 seem like not such a great feat after all.