Here is the link: http://www.jenniferhoffman.net/horse/horse-color-genetics.html Kudos to Jennifer Hoffman for making this wonderful tool!
If you start from the actual webpage (I just linked you to the game itself), a guided tour will explain colors and alleles as you go along.
The thing I didn't like about the guided game was that it didn't record previous changes to the horse's color. For example, I had the horse as a seal bay, I proceeded to the next color gene, and the horse changed to a bay, chestnut, black, or otherwise. What?
For that reason I skipped to the end, where I could change any and all alleles, and all at the same time.
It seems people really, really, like this game. One of the comments complained that the game allows you to make impossible colors (such as being homozygous white, which produces a foal that dies in embryo). However, that has been fixed. Now, if you'll try it, you'll be able to have one copy of the white gene, but with both of the copies, the horse vanishes and the text says "Embryonic Lethal". The game also is accurate so far as the four linked or almost-linked KIT alleles.
Another accurate feature - it shows the gray (G) gene as dominant. You can have a multitude of colors underneath, but if a horse has the gray gene in it's phenotype, this will cover everything except white (or pinto) markings.
Interested in horse color genetics? Read more articles here!
Here's a replica of the stable's AQHA stud, Billy. :)
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