thanks for the mostly helpful responses, folks.

"Illusionary walls => do some gamers really need everything printed out in explanations?
Kiya <shaking her head in disbelief> "

No, actually. My question had nothing to do with whining about not being told this or that, and needing the remedial help of a manual to tell me that I would encounter an illusory wall. I brought it up because it seemed coincidental that all this was happening in the same act, at virtually the same time, which one could reasonably take as buggy behavior. So I thought I'd ask.

I'm glad you found the hole thing funny. I didn't. But then again, I don't think Jerry Lewis movies are all that hysterical, either.

I really do appreciate the helpful explanations, but I don't need third rate patronization from a very large fish in a very small glass of water.