The primate transmission in System Shock 2 was awesome.

flipping an elephant in halo 3 and getting the message
"Press RB to... wait, how did you do that?"

fix-the-spade:

It wasn't much of a secret, but I always loved seeing the BAFTA award in the safe of the G5 building.

Oh yeah, forgot about that one. Funny. Also, I know it's technically an achievement, but I laughed when I first found the Gnome in HL2:Ep2 before I checked the achievements. 'Course, now I hate the damn thing, lol.

Anarchemitis:
The place in the Half-Life 2 Episode 2 caves where you can only get at it with noclip & a message pops up saying "How did you get back here?"

Hmm, never heard of that one. Do tell, where is this "secret cave chamber" located?

Finding a picture of mario in legend of zelda for the 64. I was just dicking around and I saw it. I lold.

i giggled with glee when i could flush toilets in the Max Payne Demo. I never bought the game.

Reload92:
Any game that lets you flush toilets. Most of the time when I walk up to toilets in-game they do nothing. But sometimes it flushs, which makes me feel all good inside.

(That wasn't weird at all)

Hey I'm not the only one :P!

Ripshot:
flipping an elephant in halo 3 and getting the message
"Press RB to... wait, how did you do that?"

Thats gotta be one of my favorate as well.

Other then that, most of BioShock's off the beaten track (ie place you dont have to go). Stuff like the parents who have comitted suicide because their child is a little sister (although thats really morbid) and the ghosts in it.

Also im suprised noone mentioned the "hidden" areas in Portal, where the guy there before you has done stuff like sticky tape a picture of the conpanion cube over some model's face.

How about the key to Midgar in Final Fantasy VII? That was pretty awesome. The game actually had a lot of secrets.

Duke Nukem 3D had hidden messages outside the level's normal boundaries. You needed to either noclip or open the levels in the game's editor to find them. One map had a message from Levelord saying "You're not supposed to be here." Secret levels were pretty cool in ye olde FPS games like Doom, Duke3D and Quake. It's too bad secret levels don't seem to exist in FPS games anymore.

"THERE IS NO COW LEVEL!"

Mila's nightmares in Psychonauts

Dungeon Keeper where you stay up late or kill the end goody.

The_root_of_all_evil:

Dungeon Keeper where you stay up late or kill the end goody.

Oh and if you get a lot of Mistresses. you get the message "You have an excessive amount of Mistresses... There is a word for keepers like you.."

Well, my friend and i found a glitch in Halo, where you go from the beginning of the level to the end of the level, skipping most of it. i dont remember what its called, but its the one where you spawn on the beach and the choppers drop off some mongooses (mongeese?), and you drive up to kill a wraith and a bunch of enemies.
Also, i find all of my CoD glitches, they arent secrets, but still fun to achieve.
Insomniac Museam was still fun to find.
And random MGS4 easter eggs. so many, like one i found was, on Sonny's computer, theres a little Otakon that helps you in MGO, the little animated one, and also on her computer during the scene with Raiden where the numbers and characters on the screen make Otakon's face again, she must really like him...

Technically this isn't a secret as it is a welcome surprise. The first time you die in Conkers bad tail day you get a lovely little cutscene featuring the grim reaper.

Vigormortis:
Oh yeah, forgot about that one. Funny. Also, I know it's technically an achievement, but I laughed when I first found the Gnome in HL2:Ep2 before I checked the achievements. 'Course, now I hate the damn thing, lol.

Yeah, what level was that on?

Anarchemitis:
The place in the Half-Life 2 Episode 2 caves where you can only get at it with noclip & a message pops up saying "How did you get back here?"

Vigormortis:
Hmm, never heard of that one. Do tell, where is this "secret cave chamber" located?

Water Hazard level. It's called the "Singing Vortinaught Cave' and you get an achievement for finding it. I haven't, though.

The suicide mage in Morrowind that tested his spell for the first time as well. Loved watching that guy drop like a stone

The Hydralisk in WC3

The Lazar Bear in Age of Mythology, forever proving Canada's place as the best country EVAAAAR

Zombie_King:

Water Hazard level. It's called the "Singing Vortinaught Cave' and you get an achievement for finding it. I haven't, though.

So, there's an actual vortigaunt in there, singing? Hmm. Oh, by the way, if you have sv_cheats enabled, you can't earn achievements. Anyway, thanks. Have to find that one.

As for secrets, remembered another. The two secret maps in Doom 2. I loved playing with a friend over dial-up or a LAN and making our way to that secret Wolfenstein map.

Also got to love finding the hidden "dens" in portal. Weren't they called the ratman dens? I forget I have to play it again for the 17th time lol. Just finding those were kind of cool, but for the most part creeeepy, especially the one with companion cube pictures.

Blood (the original)
there was a secret cave full of mimes at the carnival level and when you kill them all theres a hanged duke nukem there. You can poke him with the pitchfork at which point caleb says "shake it baby" as duke's body swings on the rope.

Now THATS a secret.

The Hall Of Heroes Isnt That Much Of A Secret

I Like To Think Of It As A Bonus Level After Getting The Chalice

Ratchet and clank was full of them.

San andreas where you could use a dildo as a weapon and it's found in the police showers. Can't top that one.

JBX06:
The Hall Of Heroes Isnt That Much Of A Secret

I Like To Think Of It As A Bonus Level After Getting The Chalice

Yeah but you had the option never to go there I believe.

Not quite as interesting, but I loved discovering the website in GTA4 that tells you where all the pigeons, weapons, jumps and random things are. Apparently you can also meet the killer that leaves random body parts in bushes. Never did it myself though.

Ooh, actually I just like the random Cokehead you meet on the street that gives you fifty bucks because you rip the piss out of him. That amused me greatly.

OctoBush:
1) where's the house
2)Croc! Croc had loads of secrets. such as the tiny slipperry(?) island which hangs over infinity. or the cave full o snakes.

my first game ahh.. any way uhh probobly the lightsabre in republic comando and the pediphile site in gta4

hmm i love the warp zones in the orginal super mario bros for the NES, and then Vice City i found the literal easter egg by myself

Generally just finding a new cave, aylied rune or Gate in Oblivion I haven't been in yet. I'm a natural explorer.

The Insomniac Museum.

Damn, I would've loved to fight with the Revolverator.

AsdaCoke:
Generally just finding a new cave, aylied rune or Gate in Oblivion I haven't been in yet. I'm a natural explorer.

Yeah Oblivion was insane at that. If I ever tried to find all the caves and little areas I'd have another 50 hours added to my gameplay. Not to mention addons. Heck I have 130 hours logged onto the game and I haven't even touched the main quest. Now that's insane.

Oblivion's kinda brutal that way.That's why I can't wait for TES5. Hope its as relentless at devouring our precious time. Man, I love TES.

hmm wonder if there are any secrets in the hitman games? I'm playing one now.

Getting the "space" ending in The White Chamber.

I looked everywhere afterward, and there was absolutely no mention of that ending, so I felt a bit smug.

The_root_of_all_evil:
"THERE IS NO COW LEVEL!"

Mila's nightmares in Psychonauts

Those too.

Hmm I wonder if there are any good secrets in Fable 2

jake557 :
finding the insomniac museum in ratchet and clank 3

Heck yeah, that was cool...
Now I don't know if this is a secret, but the ability to fast forward time in Chrono Cross after you beat it was a very nice bonus.

YukoValis:
Hmm I wonder if there are any good secrets in Fable 2

Hehe, I was going to post the Winter Lodge behind the Bloodstone Demon Door. Beautiful area, and it scared the shit out of me. Go look inside. xD

-The movie references strewn around Duke Nukem 3D.
-The suicide note from the troll under the bridge in Oblivion.
-Of course, the cake stuff from Portal.
-The basketball secret from System Shock 2.
-The video games you could play on your Game Pig in System Shock 2.
-The chainsaw from Doom.
-The "Whoopsie!" from Mortal Kombat II. To this day I still laugh at that.
-To me the best "secret" is the entire Half-Life saga. The interconnectedness of it all really seems like it was made by geeks for geeks. Trying to explain the Half-Life mythos to someone is a little more than futile without them experiencing it firsthand, what with all the detail involved. Magnusson's comment in Episode II about the mircowave was the icing on the cake.

Getting the "Space Pony" Achievement in Sins of a Solar Empire