InsaneJournal

Level: Post Hogwarts Advanced
Subject: Hogwarts Magic

There are 142 staircases in Hogwarts School of Witchcraft and Wizardry. They rotate and move on their own schedules and give no attention to who might be using them at the time. There are also many trick stairs that cause the victim to sink through a step and require another person to pull them out. ~ Wikia

Game Canon
+ Stair rotation cannot be altered
+ Stairs lead up to the 7th floor
+ Older students likely know the trick steps well
+ There is no warning when a staircase is about to move