A silver key is required to open this door.
Poelab locked door.
I just look for the intersection of these 2 side by side doors.
Silver doors are locked doors that contain a special loot chest.
These are not required to progress through labyrinth and are only optional.
This is one way to find 1 variation of hidden switches in the labyrinth.
You must follow the pattern located on the floor outside the puzzle room.
They are indicated with a grey door symbol on the labyrinth map.
Be sure that the pressure switches are being triggered and remember you cannot trigger switches diagonally only the adjacent ones.
Step on these switches furthest from the door to the closest one.