TripleM wrote:

Click here to view the secret text

×Kill the guard.

Click here to view the secret text

×Drop 6 or so trapdoors.

Click here to view the secret text

×Walk to the brain.

Nuntar wrote:
Basics of brained rock giant movement: (1) Like all brained monsters, it follows the quickest path to you, but certain objects, including force arrows, are treated as obstacles it cannot cross. (2) Although the monster is 2x2, only one square is actually doing its pathfinding. To see what I mean, from the checkpoint in this room, move 3xN, W, 3xS. The giant gets stuck because its pathfinding square can see a way to you, and it tells the giant to go in a way that it cannot move.

Therefore, you need to cut off all 1x1 routes towards you except the one you want the giant to take. The key trapdoors to remove are

Click here to view the secret text

×the two pairs south of the columns of force arrows, and the pair between the southmost arrows

Nuntar wrote:
Let the guard come to you. Guard pathfinding has a lot of similarities with brain pathmapping -- in particular, it treats force arrows as obstacles. So if you go over the arrows too soon, the guard won't see any paths that go round a corner.

Nuntar wrote:
The guard doesn't have to stay on his pressure plate, he only has to step there for one turn to allow Gunthro to pass through the last door. Then the guard can come round the corner.

The guard will then step on one of the pressure plates that close the large door leading to the brain. How do you get around that problem?

Click here to view the secret text

×Wait for him on the door, so you can step off it to the north side after killing him.

Nuntar wrote:
He does move if you leave a path open.

Jacob wrote:
Guards and brained enemies can't path map over arrows.

Camwoodstock wrote:
I... Give me a complete demo.