So you've been using Photoshop for a while and you may be a pixel slinging bad ass. Now put it to the test.
This is the RGB Challenge. You are given three values for red, green, and blue. Based on those numbers, you have to pick which color that total value represents!
It seems obvious, but can be quite tricky when the colors start getting close together. It really makes you think in numbers. For more artistically inclined creatives who aren't as up to speed on the technical end, this really helps. It definitely helped me to think through numbers as well!