Thanks for the comments, da rogu3! Just please don't give out solutions so openly, especially when there's no need. I'm referring mainly to what you said about 2 and 3. I'm not too concerned, since those were early puzzles, but I'd appreciate it if you'd crop up your post and be more careful in the future.
The next update is again attached here.
Changes:
5: A bit of restriction added, partly by means of additional freedom.
11: Returned to its previous state. I'm not going to worry about it.
12: Just another door.
13: Just another stone.
14: A bit less room on the NE corner.
16: The obvious force arrow. I probably won't worry about your other solution, TFMurphy, even though you didn't do quite what I intended with the aumtlich.
17: Added another disarm token. I wish I'd thought of that before.
18: Oh, yeah. I just forgot about that other suggestion. It's implemented now.
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Penwielder's Palace,
Detention Complex,
Archipelago,
Cube of Memories