Again

And again

And again

Regarding a "tougher level 3" we only did it once. I cannot comment. Tim Child says it was tougher. It's not like he has a reason to lie. As I recall, it did require some degree of negotiation and remembering the correct details (to get Maldame on board). Don't underestimate the difficulty of something like that. From the moment we started filming, we were bombarded with new information regarding the dungeon, the NPCs, what was going on, and so on. Much of it was contradictory or outright wrong.

It's very easy (as a viewer) to forget that the teams going in to the dungeon have 0 knowledge from previous teams.

As for communication with Maldame, I'd suggest you're somewhat ignorant of the facts. While the Maldame room appears to be one construction, it's actually made up of two different rooms in distinct geographical locations. This makes it somewhat harder to relay instructions between three advisors and someone else that you can hear next door (and, along with feedback) through an earpiece one second later.

The golden galleon was filmed afterwards - with Tim Child guiding the dungeoneer. He couldn't see the plank, because it took him several attempts.

I'm happy to answer any other questions you have, providing you can moderate yourself