After ingesting the Rage Potion.
Alice, just drunk the Rage Potion, which transforms her into a mad monster with horns and claws.
The 3 slates are puzzles. One of which is a portal.
Her task here, is to leap across the chasm of floor sans falling into the abyss.
All of a sudden, the marble floor breaks and tumbles and levitates above the ground. Alice is to climbe these precarious pieces into the door above.
The question here is, Which door to pick.