No, there are only 2. In the room with the falling-ceiling-trap you need to pee into
2 pots.
Step by step:
1. Go into the room and skip or wait for the cutscene to finish.
2. Go left to the hole in the wall and hit "F" to get in pee-ready.
3. Fill the pot with pee till the chains snap and the pots falls down. (Your pee will look like an oil-layer ontop of the water in the pot)
4. Run diagonal to the other side and do the same thing from step 2+3.
5. Ceiling will stop going down and the door will open.
Mirrofuks You could look up the walkthrough linked in the OP. Your problem is explained there.