At the house, they are trapped in a room, and must solve puzzles given by the host, who calls himself "Fermat", in order to escape the slowly closing walls of the room.
They are trapped in a room. This was at the house. This was to escape the slowly closing walls of the room. They must solve puzzles given by the host "Fermat". This was to escape the slowly closing walls of the room. This was in order. This was at the house. The host calls himself.