Room A2 "Quad"

This one's not quite as complicated as it looks. The floor ridges limit your options somewhat.

However, have a look at how many receivers there are, how many have timers and how many are connected to the same door.

That's right - four receivers, all with timers, all connected to the same door.

You know the deal when two receivers with timers are controlling a door - reckon it's a similar situation with four?

There's also just one emitter - so that means...

You're going to need to split one particle into FOUR.

Start by splitting it in two.

Then you can split each of that pair in two

Then you should be able to use the old entanglement trick to steer two of the particles into their receivers.