Perform Exorcisms
After you find the camera, in a level 6 security door behind a destructable wall in armory south, take pictures of random stuff. When viewing the pictures, you will see other pictures of some freaky stuff laid over top of yours, and there will be a new option that says "exorcise". All this does is makes the ghost go away, so do not do this if you like the way it looks.
Verified Ghost Photos:
1. The Dead DARPA chief (in the medical room holding cell, not Decoy Octopus)
2.The bust with the bandages on it's face on the left side of the Command Room (where you fight Psycho Mantis)
3. The mirror on the right side of the command room (where you fight Psycho Mantis)
Alternate Ending
Instead of hurrying back to fight Sniper Wolf and save Meryl, or holding out while being tortured by Ocelot, do whatever you can to allow Meryl to die during the course of the game. Then, instead of riding off to a happy ending, Snake will simply ride off on his snowmobile all by himself to fight another day.
Get Liquid's Dog Tag
While in the hand-to-hand fight with Liquid, get him near the edge. Once there, start your punch combo, then finally kick him off. He will grab on to the edge, and as he does, his nametag is up for grabs.
Escape Medical Room Prison Variation
After the torture room scene, Otacon will come to Snake give you all the items you need to escape the holding cell. Alternatively, if you wait even longer the Ninja will come and open the door for you.
Meryl in Her Panties (another one)
We all know Snake is a ladies man (and a pervert,) so I believe this cheat suits him. After the battle with The Ninja you are sent on a mission to find Meryl who is wearing and enemy uniform on the floor B1. Once you discover her she will the make a run for the girls bathroom to the right of the elevator. Be in hot pursuit and make it to the bathroom at least a few seconds behind her and through out that whole cut seen she will be in her underwear. You go Snake!
Meryl’s Taunt
After you go through the wolf caves and end up in the minefield (right before Meryl gets shot by Sniper Wolf). After Meryl crosses, run into a mine. Keep doing this. Meryl will then whistles and slap her rear. Repeat this to see her do it again.
Upset Meryl
Right after you meet Meryl in the Restroom of the Nuke Building, Go into first person mode and stare at her breats. She will spit out comments like "Why are you staring at my...?" or "Don't look at me like that!"
Make Mei Ling Mad
Using your very cool and high tech codec call Mei Ling. When giving the option of saving or not select not saving. Do this a few times and eventually she'll give you a brief talking to and she'll stick her tongue out. Not very professional Mei Ling.
Meryl in Her Panties
When in the Holding Cells area, crawling through the vents to find the DARPA Chief, you'll first see Meryl doing exercises in her cell. Before going forward to meet the DARPA Chief, exit the vent the same way you came in and re-enter to see Meryl doing exercises in her undewear. You can leave the vent and come back once again to see her performing other exercises.
Outer Heaven Nametag
After the scene where the Ninja kills all the soldiers outside the Lab, Look at the soldier closest to the door. You have to look down using your scope, but his nametag says "Outer Heaven". You'll get a better camera angle if you look at it upsidedown.
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