I'm looking to collect some of the most challenging puzzle games, so any who can suggest some, it would be greatly appreciated. Also I should mention that I'm not looking for games that are challenging due to poor game design, only those with complex puzzles

Hi IncognitoSOS and welcome to GameBoomers!

Are you asking for recommendations for adventure games with the most challenging puzzles, or for puzzle games with the most challenging puzzles?

to GameBoomers Incognito!

Are you looking for adventure games or do you mean puzzle games like Safecracker or Azada?

EDIT: Hi Becky!

Hi Ana -- thinking and posting alike!

I've played both and enjoy both, so any suggestions you can make in either genre would be appreciated.

Puzzle games are handled in Casual forum and adventure games are discussed here.

Sorry about that, I was confused by the terms, I mean adventure games, not puzzle games. I was under the impression that puzzle games were simply a adventure game with no story. My mistake.

These are a few I found challenging:
Schizm
the Myst games
Uru
the Rhem games
Obsidian
Rama
Blue Ice (I haven't played it, but I've heard it's almost impossible to finish)

Here are the games I found to be the most challenging for me:

The Experiment
Schizm
Pretty much all the Myst games
Aura2 (The Sacred Rings)

There are a few more can't remember the titles though
maybe I will later

Adding to what has already been mentioned -- here are the games that ranked up to the number 20 in last year's GB Annual List that I played and thought had the most challenging puzzles.

Grim Fandango
Keepsake
Sherlock Holmes Nemesis
Darkness Within: In Pursuit of Loath Nolder
Riddle of the Sphinx: An Egyptian Adventure
Mysterious Journey 2: Chameleon
Sentinel: Descendants in Time/Realms of Illusion
Yoomurjak's Ring

Note: it's a bit hard to separate games with puzzles that are difficult and fair from games that are difficult because of poor puzzle design -- often examples of both types of puzzles are to be found in the same game. And, frankly, I tend to think the puzzles that are well designed are the ones I work at until I understand, and the ones that are poorly designed are the ones I don't understand on my own. Though often other gamers may "get" the ones I don't, and vice versa.

Myst
Riven
Myst III: Exile
Uru
Reah
Schizm: Mysterious Journey
Schizm 2 (Mysterious Journey 2)
Sentinel (Realms of Illusion)
RHEM 1, 2, and 3
Alida
Obsidian
Riddle of the Sphinx
Keepsake
Aura (the first one, not so much the second)
RAMA
Safecracker
7th Guest
Shivers
9: The Last Resort
Morpheus
The Arrival
Zork Nemesis

I agree with a lot of the games mentioned: Keepsake, great game but hard; Obsidian-very different and worth playing; the Myst games particularly after the first one (at least for me),but by far the most difficult for me (but also enjoyable) was Black Dahlia. Boy, I had that walkthrough sitting right next to me!

I shall add Chemicus to the difficult list, at least for me.

I agree. I also remembered a few more:
Drowned God
Milo
Chaos a Fantasy Adventure
Entombed Enhanced

I would agree with a lot of those mentioned, and Jenny100s list is pretty spot on.
Ones that particularly stick in my mind were:

Schizm 1
RAMA
Black Dahlia
Drowned God
Rhem 1
Alida
Riven

Keepsake
Myst series

Rama was one I could never get to grips with.
The maths just totally eluded me

Mchinarium & Samarost were very puzzle oriented,
and also lots of fun!
Have you tried "Rooms: The Main Building "?

How about Black Dahlia and Gabriel Knight 3?

Barb,
I remember having trouble with the computer in GK3. Black Dahlia was tough but what a great game.

Among the most challenging games I've played so far were the following:
- Shivers; really tough puzzles but great fun nonetheless
- Agon; from episode 3 onward, the puzzles become harder and harder
- Myst; I must admit I gave up on it after I don't know how many times. Last time I attempted to play the game, I used a walkthrough and even then the game just didn't work for me.
- Dracula 3 - Path of the Dragon has some very hard puzzles, I think
- GK3 - great game but I remember using a walkthrough for most of the last chapter; especially the chess board and the computer made me give up to a certain extent.
- Outcry has some tough puzzles as you progress; the tough thing about Outcry is that you don't get any hints as what to do next and no hints as why you're doing what you're doing.

The most challening game for me was Keepsake. Although it's a 3'rd person perspective (but different from the regular 3'rd person perspective), I keep losing my sense of direction. Certain parts of the game requires me to go back and forth the same place and I have a hard time getting to the right place because the navigation was tough. The puzzles are hard too, I like more of the inventory puzzle type. I gave up this game midway.

The other 2 challenging games are the Dracula: Resurrection & Last Sanctuary. These games are hard because it is in the 1'st person perspective. I also lose my sense of direction and get dizzy sometimes. I gave up both games as well. These 2 games are available in jewel case for $9.99 and it's a real bargain!