Trails or tracks on difficult and treacherous terrain (steep and/or slippery slopes of grass, or mixed rock and grass, or rock and debris). Varied terrain at relatively high altitudes (rocky areas, short non-steep snowfields, open slopes without landmarks, etc.). Rocky sections with slight technical difficulties (equipped paths, via ferratas among those with lower commitment). However, routes across glaciers, even if flat and seemingly without crevasses, are excluded because crossing them would require the use of a rope and ice axe, as well as knowledge of the related safety maneuvers. Necessary requirements: experience in the mountains in general and a good knowledge of the alpine environment; steady pace and absence of vertigo; suitable equipment, gear, and physical preparation. For equipped paths, it’s also necessary to know how to use self-securing devices (carabiners, shock absorbers, harnesses, cords).