There are also double blacks, maybe even a few triplles depending on where you go.
Green Circle= easy
Blue Square= intermidiate
Black Diamond= Hard
Double Black Diamond= exeptionaly hard
Triple black diamond= Expert
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That depends on which country you are in.
In some countries (e.g Italy, Switzerland and Austria) the colors blue, red and black are used with blue beeing the easiest.
In other countries (e.g. France, Andorra and Sweden) green, blue, red and black is used with green beeing the easiest.