WASD or Arrow Keys to move, Spacebar on square switches to switch them. Stand on circle switch to activate it. Beware of the lasers! They also send your partner(s) to the start too.
Patch 1.1: Fixed lasers not resetting your progress You need to be a Scratcher for this to work, as New Scratchers/Guests cannot read cloud variables. You can check this on your profile under your username. Also, I would recommend being in the same room as your friend(s), or just be able to talk to them in general.