I have found one button to turn off the teleporter in the middle of the room so I can drop down and get the key. I think the button was on the trial of thoughts (9x9 teleporter room) side. The pits close and you dash into the room and press the button. Where is the other button??
Also, the maps by nanu show a secret between the 9x9 teleporter room and the pressure plate puzzle that comes next. Any ideas how to open it. Is this all the same problem.....

Tough game.... awesome!