Alternate ending:
Successfully complete the game three times to hear
alternate music during the ending sequence.
Bandanna:
Successfully complete the game after not submitting
to the torture. At the end, Meryl will be alive and give you the
bandanna. When equipped, the bandanna will allow unlimited ammunition
on any weapon.
Camera:
Successfully complete the game to unlock the camera.
Use the camera to take pictures to see various extras, such as
the faces of the development team.
Extreme difficulty setting:
Successfully complete the game to unlock the extreme
difficulty setting.
Meryl demo mode:
Successfully complete the game after not submitting
to the torture.
Otacon demo mode:
Successfully complete the game after submitting to
the torture.
Meryl costume:
Successfully complete the game two times after not
submitting to the torture.
Otacon costume:
Successfully complete the game two times after submitting
to the torture.
Stealth and Tuxedo costumes:
Successfully complete the game two times with either
outcome.
Control intermission view:
Wait for the message "Camera Change" or "Camera
Free" to appear during an intermission sequence. Hold L
+ R to zoom or C-stick to change the view.
Eternal Darkness
references:
One of the magazines found in the game has a picture
of Alexandra Roivas wearing a bikini. Pick it up, open it, then
zoom in on the contents to find her.
Have a saved game file from Eternal Darkness on your memory card and Psycho Mantis will make a reference to that game prior to the Boss battle.
In the Armory, there is a poster of Eternal Darkness in one of the lockers. The poster has a giant picture of a skeleton on it.
The Legend Of Zelda: The Wind Waker
reference:
Have a saved game file from The Legend Of Zelda:
The Wind Waker on your memory card and Psycho Mantis will
make a reference to that game prior to the Boss battle.
Super Mario Sunshine
reference:
Have a saved game file from Super Mario Sunshine
on your memory card and Psycho Mantis will make a reference to
that game prior to the Boss battle.
Super Smash Bros. Melee
reference:
Have a saved game file from Super Smash Bros. Melee
on your memory card and Psycho Mantis will make a reference to
that game prior to the Boss battle.
Zone Of The Enders
reference:
Look at one of the posters in Otacon's office to see
the graphic from the front of the Zone of the Enders: The 2nd
Runner box.
Mario and Yoshi reference:
Look on one of the file cabinets in Otacon's office
to find statues of Mario and Yoshi. Shoot the Mario statue to
hear the classic "extra life" sound, and increase your
health. Shooting the Yoshi statue does not do anything except
make a sound.
Game company portraits:
During the battle with Psycho Mantis, three pictures
are hanging behind him on the wall. The people pictured are Shigeru
Miyamoto (Nintendo), Hideo Kojima (Metal Gear Solid's creator),
and Denis Dyack (Silicon Knights).
Gamecube hardware:
Examine the desk in Otacon's office to see a Gamecube
with a Wave Bird controller. The video monitor also displays the
Gamecube start up screen.
