Metal Gear Solid: The Twin Snakes Cheats (GameCube)

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!"

When fighting the Ninja in Otacon's office, look in the northeast corner of the room for
two miniatures of old Nintendo favorites. If you shoot Mario in first person view a "1UP"
will appear over his head, and Snake will gain a bit of health. You can use this as much
as you want, during the Ninja fight and afterwards.

Extreme difficulty:

Beat the game on Normal. 

Camera:

Beat the game once to unlock the camera. You can use the camera to snap shots

during the game, some of which give you extra surprises. 

Meryl demo mode:

Beat the game but do not submit to the torture. 

Bandanna:

  Beat the game but do not submit

  to the torture. At the end, Meryl will give you the

bandanna, which gives you unlimited ammo.

Meryl outfit:

Beat the game twice and do not submit to the torture either

time. 
Otacon demo mode:

Beat the game but do  submit to the torture. 

Otacon outfit:

Beat the game twice and do  submit to the torture both 

times.

Stealth and Tuxedo outfit:

Beat the game twice.

Different  ending music:

  Beat the game three times.

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...forcefully.

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.

Find an area with two cat-walks, one over the other. (such as the left side of bay where
Metal Gear is stored) and move yourself to hang over the edge.

Now, here comes the difficult part. Drop down when you feel ready and rapidly press the
action button so you grab onto the lower cat-walk. It may be dangerous (because if your
timing is off, you will die), but after 5 or so times of doing it, your grip level will be
at Level 2. Keep doing it for level 3.  It's much more faster than the pull up method.

Complete the game once with either ending.

During cut-scenes, pull the R trigger to zoom in. Once zoomed, you can use the C-STICK to
pan the camera around and pick your shot.

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.

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.