The Trigger Stage

A mad house. That must be where they were. Skye and Marco were definite they were brother sister, and promised their bond be almost unbreakable. Almost.
With no memory of the outside world, but a mysterious map of the mansion they were in implanted into their brains, finding a way out seemed harder than it felt at first glance. With the huge house showing no way out, or even any evidence that it was still a house, Marco is getting weaker and Skye is getting stronger. Strange voices from above guide their every move, trusted with the siblings' life, and a strange message always mentioned the same sentence at the end of every message:
"Never forget The Trigger Stage, you have to reach The Trigger Stage."