What do you think is the greatest videogame puzzle of all time?

I was replaying Silent Hill today to get myself more excited about SH2.  First of all, I\'ve had this game forever, but I never finished it.  Just one of those games I dropped after a while...but I\'ve come back to it now and started over.  This is a great game, and I had forgotten that...

Anyway, I had completely forgotten how to solve the piano puzzle in the school, and it took me a few minutes to figure it out.  It got me thinking about puzzles in adventure games in general...

What do you guys think is the greatest game puzzle of all time?  I mean this in terms of difficulty and the satisfaction you felt when you figured it out...and hopefully you figured it out for yourself, rather than using a walkthrough...

Well, my so called "favorite" is probably the hardest puzzle in Riven (a nice slide-show game, but pretty). It was like a board where u had to put gems in the right holes. I tried to figure it out, honestly, I thought about it like four hours straight. And u know what, I actually did!! I just didn\'t understand that I had the solution on the paper! I tried everything else. It was pretty irritating when I read the solution when I already had it.
Well, Riven was a useless game anyway.

Yeah some of the puzzles in Myst were twisted but kewl.

Gotta give some props to the Water Sample puzzle in Resident Evil 3.

The second I read the topic, Silent Hill popped into my mind. Some of the puzzles were really cool and perfectly balanced that they\'re not too hard nor too easy. Prime examples being the piano and horoscope (so damn simple, yet it took a good while) puzzles.

But I don\'t think these are the "greatest" puzzles ever. Can\'t really say... In the days gone by, there were many inane, near impossible puzzles (I remember some from BioForge) that really messed up your brain. There were some that were just made to annoy the hell out of you and some that really required you to give those little gray braincells a good jog around and felt really rewarding

But I must say, the most rewarding moments of puzzle solving that first come to my mind are those two puzzles from Silent Hill that I mentioned. The piano puzzle was great fun (remember when we were solving it \'Lady? It took like an hour or something ). And after solving the horoscope puzzle I felt great, as if I\'d just conquered a mountain all by myself. After a few moments of glory I felt a bit silly, since the mountain now seemed more like a tiny mound once I had figured out the simple system. Great stuff.

I hate The 11th Hour.[/i]  Man how I hate that game.  The puzzles were way too difficult.  Ridiculously difficult.  Absurdly difficult.  I hate riddles, so that part of it really annoyed me, but the actual puzzles like the chess puzzle just pissed me off to no end.  And I\'m a good chess player.  Good riddance Trilobye, may you all be cursed forever.

Not the greatest but the Onimusha Water Puzzle was kind of nifty where you had to move the slots around in a time limit.

I remember a bunch of people coming to this forum and asking for help on it.