In Tourian Escape Room 3: Added an obstacle representing the Space Pirates being cleared, in order to be able to use the runway near the top-right door. This avoids duplicating a bunch of requirements.
In Tourian Escape Room 4: Added a node for being at the top of the room without the acid being triggered. This again is to avoid duplicating a bunch of strats. The runway up there is used to get temporary blue to carry out the left door.
Some changes worth nothing: