MGS1 Glitches

Initially found by iLL_Pazzo:

Recreations by Jaguar King:
https://x.com/Jaguar_Kings/status/1838763716046721051?t=FT-wZKQRm7x-RuB7sov1LQ

Latest setup by iLL_Pazzo
https://youtu.be/LWxYcsfqhK4

General Setup working for all versions of MGS (MC, Classic Console, Classic PC) by iLL_Pazzo

Simple Setup using leans and angles by Hau5test:

Coverage how this trick came together by Hau5test:

Time Comparison Glitched vs Non-Glitched Route on Extreme Difficulty by oICEMANo

further notes by oICEMANo:

As mentioned, to do the glitch you need pretty much full health.
When picking up the Nikita on the glitch version, the timing of that is almost frame perfect. You have to get Meryl's attention with the gun and then pick up the Nikita and as you leave that door, the guard down the bottom right turns towards you and if you bump even the door frame on the way in, it slows you enough that you get an alert.
The glitch without first person mode is crazy annoying to do

OoB by Texture Slip

Originally found by Magnum66 on Master Collection

Recreations were done on:

Explanation video how to recreate this trick

With this method you can also slip OoB in the snowfield map

Snowfield OoB performs by BigBossSnake

Recreation

Crawl backwards against a special step.
Stand up (while also leaning into the step other snake will refuse to stand up)
Go prone.
On step 3 snake does a kick back into the steps. This kickback was removed in Intergral so he just lays forward.

So far it only works on Nuke Bldg 1, Tower A/B roof, and Blast steps.

!! To actually go OOB in Nuke and Blast, the stand up animation has to be “cut in half” !!

Snake needs to stand up but before being fully upright, go prone.
The PSG1 makes this simple. Box is needed for Nuke bldg because Campbell said so

Version Limitations

Further testing done by BigBossSnake assumed to be working on the following releases:

PAL
NTSC-U
NTSC-J (OG JP)

Reason why the following slips won't work is because the step animation was changed for the Integral release as sort of bug fix (presumed).

not working for:

NTSC-J Integral

Video Examples

Texture Slip in Blast Furnace as found by BigBossSnake
“Stairs glitch in blast furnace. Makes use of the little kick back snake does on NTSC.” - BigBossSnake 08/27/2024

Texture slip in Nuke Building 1F as found by BigBossSnake
“It uses the same kick back trick as last one showed in Blast Furnace. However this time cannot use PSG1 to cancel standing up animation.” - BigBossSnake 09/10/2024

Heliport OoB Glitch by BigBossSnake
“It's very precise on these steps as the kickback only happens when going prone on the very edge of the last step.”- BigBossSnake 09/12/2024

Similar, this is how the Tower A Out of Bounds was done in the NTSC-U version of MGS by Magnum66 prior to the Docks finding.
Texture Slip on Tower A Roof as found by magnum66

Old Hind Skip by magnum66

HD recreation of Magnum66's old Hind out of bounds video by Hau5test

New Comm Tower A OoB Glitch by magnum66

Hind-D Fight going out of bounds by slipping between two textures found by Tilt

Recreated on PC 2000 Integral version top right corner stinger setup by Hau5test

Recreated on UK PAL PS One Console with Grenade Setup by Hau5test

Recreated on NTSC-J PSX Console with Stinger Setup by Hau5test

Recreated on UK PAL PS One Console with Stinger top right corner by Hau5test

No Weapon Setup by BigBossSnake

Finding summarized by Hau5test:

Headless Scope Glitch

Originally found in 2018 by Tromboncino, we can achieve a headless state
while using the scope in the PC 2000 version of MGS Integral

The basic idea is as follows:

have no weapon in hand
equip the scope
use a weapon hotkey to add a weapon into your hand
double press triangle to enter fpv mode
because the scope already is a form of fpv, instead of going into fpv mode you're now in regular camera, while the scope is active
from here you can keep using your grenades even when they're empty, but they only explode in your hand

Headless Scope Glitch for temporary grenades found by Tromboncino
https://www.twitch.tv/tromboncino_/clip/StormyDelightfulPineappleItsBoshyTime

Raven Boss Example with temporary infinite grenades (slower than full grenades)
https://www.twitch.tv/tromboncino_/clip/AbnegateBoldNuggetsRedCoat

Permanent Infinite Grenades (PC 2000)

On August 17th 2025 then J-N experimented with this glitch further and found out you can
achieve a permanent state of infinite grenades if the torture sequence takes your inventory away
then when retrieving your inventory after this segment, the grenades are still glitched and you can now
use them like regular grenades, only that you have an infinite amount free to be used for the rest of the run.

Permanent Infinite Grenades (P.I.G.) Found by J-N

Full explanation of the setup and trick by Hau5test

Permanent Infinite Grenades (Console)

You'd think, because we need the headless scope glitch, that this result of getting infinite grenades is only possible on the PC 2000 release.
But as it turns out, that is not true! BigBossSnake has tinkered more with the game on emulator and found out on August 18th that we can indeed
get a similar result to that of headless scope glitch on console. Here's his finding in video form:

The method is as follows:

lower your weapon of choice ammo count to 0 (chaffs in this video example)
while the grenade goes out, hold R2 quickly and switch off to another weapon
this way the 0/X amount of ammo stays in your inventory
now perform a weapons glitch
in this video example it was done with the grenade
switch to the chaffs with 0 ammo
cook a grenade in your hand to get -1 ammo (glitched state)
cook a 2nd grenade in your hand not with the glitched state and let it explode
setup is complete
now go through torture, let your inventory be taken away
on retrieval of your inventory, you have now your glitched permanent infinite grenades (chaffs in this example)

Snowfield OOB by BigBossSnake

Texture Glitch via Cameras + C4 found by BigBossSnake

Cave OOB by ThrillUK

Cave OOB by magnum66

Old Hind Skip by magnum66

Canyon Save Corruption by Coppertank

Warehouse OoB Glitch (Post Raven Fight) by magnum66

Warehouse Post Raven OoB tutorial by BigBossSnake

Original Tower B Hind Skip by magnum66

Pause the game after credits, use items / weapons by magnum66

Glitch into Pipe Tower A Rappel Sequence by magnum66

Blast Furnace OoB Glitch by Koji123456 recreated by magnum66

Scope Glitch - Console GME variant - unknown first finder
by interrupting the iframes of the animation that plays while crawling out of the vent,
granting you GME on console - useful just on canyon vs the tank though

Ladder Skip for PC 2000 Ladder Skip Setup by Tromboncino Ladder Skip Time comparisons

Instant grenade explosion by Tromboncino

Solid Spistiddo

Blank Save Glitch

Otacon U.Base3 Codec Call Skip

Box Glitch by Repeatzzz

Headless Snake Scope Glitch by Tromboncino
performed by equipping scopes, then switching weapon with a hotkey and doubletapping fpv
use: to kill guards to a higher point than yours with Socom/Famas
Also applies to Rex2

Wrong Warp found by iLL_Pazzo on MGS PC Integral
See wrong warp page

Hind-D skip level up sequence for an IGT time save (banned under current ruleset)
found by iLL_Pazzo applicable for all difficulties:

Take the Stinger ammo box before the Hind ladder
Take the ladder and start the Hind fight
Kill the Hind WITHOUT (very important) using GME
When the Hind reached 0 health, just suicide
Take the ladder again and leave the roof
Go down the stairs and go to Wolf2 using GME2
Congratulation, you just saved 25 to 30 seconds (depending on how fast you suicide) on every category without even using GME or area reload 🙂