Forest Green is one of the Horses of the Rainbow. He is the son of Lovely Blue and Shiny Yellow.
He gives his owner 10 passes every Thursday (after the daily update), provided you logged in at least once over the previous 3 days. For VIP accounts, energy consumption when riding in a forest on Thursdays is cut in half.
Once you own all the 7 Horses of the Rainbow, you can obtain Secret Rainbow.
This horse cannot be sold. His skills can be increased by using passes.