Dont read here as it contains some spoilers:

Im stuck there, i press that plate on the ground after 4th click teleporter appears. I threw a lot of things in it. Those things appear left to me, behind bars(when i look at teleporter)

But i have no idea how to close those pits.. its getting tiring..

P.S. i just found an answer to a similar thread.. after seeing the answer i got really annoyed about that small minor difference! ;\

you have to throw an arrow inside the teleport, duno if it works also with some other object, anyway the arrow for some reason will stop on the right spot while everything else i tried to trow in before just didnt, not sure the reason as its a bit illogic itself, but thats it.

a rock is suffichent, you jus have to equip it and throw it as a weapon since it'll fly an extra 3 tiles that way