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The rating of ski slopes by difficulty is standardized in an effort to prevent skiers from tackling terrain that it is more treacherous than their skill level allows them to navigate. Green circles indicate easy terrain that contains few obstacles and is suitable for beginners and those who prefer to play it safe. Blue squares signal terrain that is steeper, but still
for the intermediate skier who likes occasional drops and minor obstacles as a test of their skills. Black diamonds and double black diamonds denote terrain reserved for
and include extremely steep pitches and numerous obstacles to avoid.