The Big Boss category aims to finish the game as fast as possible using non-lethal weapon strategies, not taking alerts, not healing or dying. Fore more details about the rank at the end of the game see Metal Gear Solid Mobile FAQ.
1F
Main aspects of this floor are getting the first interference minigame done and get access to the level 1 card, then moving on onto the B1 level of the facility.
Utility Room
Skip initial cutscene, skip codec
round corner tight to enter door, skip cutscene and codec
round corner tight OR climb box behind you for safe Big Boss route
enter Northeast Door
Store Room
Skip cutscene, skip codec
Enter NE door to pick up Chaff Grenades that are in the top left corner,
Equip Chaff Grenades with two taps in either direction up or down
Toss chaff before crossing camera, head into Western door then head Northeast
Base Main Entrance
Utility Control Room
Skip cutscene, skip codec
Run straight for the Node in the NE, ignore the guard
Interact with node, it will stop at 75%, skip codec and play Interference 1
After interference, there is a codec, completion of download, then another codec
Run straight for the exit
Base Main Entrance Visit 2
Primary Corridor
Auxiliary Corridor
B1
On this floor we use the octocamo for the first time, grab access to the level 2 doors and get captured. Once escape it's back up to the 1F floor again.
South Corridor
Mess Hall
East/West Corridor
Restrooms
Sleeping Quarters
Skip the codec
It's possible to make the guard notice you but not see you at the lockers by going north then west
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If guard notices you, tranquilize him instead
Central Corridor
Fusion Lab
Skip the cutscene, then skip the codec
Equip the Camouflage by pressing down once
Approach the sign, tap to look down, and mash center/5 to accept the color
Skip the cutscene upon entering the room
Climb the stairs and enter the room
Temporary Storage
Armory
Security Control Room
Enter the control room, and interact with the node on the west end
Skip the cutscene, then skip the codec
Go below the table and pick up a ration
Skip the codec and play Interference 2, skip codec
take camo pick on sw corner, go against and lean
Skip codec, then wait
An unskippable cutscene of a terrorist entering, then skip the codec
After the unskippable cutscene of the terrorist entering, run out of the room and go west
Elevator Access
1F 2nd Visit
The main goal of our 2nd visit in 1F is to get the socom, walk back to the elevator to then continue to B1 again.
Equipment Store
USE PHONE NOT WII CONTROLLER
After the elevator rises to the top, skip the cutscene then the codec
Pick up the SOCOM, approach the sensor, equip SOCOM with one tap down and fire at it
Store Room Visit 2
Skip the cutscene, then skip the codec
Head East, take the turret damage
Base Main Entrance Visit 3
USE PHONE NOT WII CONTROLLER
Fire at sensor on N 1st floor, then E 1st floor to approach stairs, then enter room on 2nd floor and fire at that sensor
Primary Corridor Visit 2
Auxiliary Corridor Visit 2
USE PHONE NOT WII CONTROLLER
Skip the cutscene, then skip the codec
Approach sensor on top, fire SOCOM, then switch to camouflage (one tap down) in fpv and take a photo of the sensor
Enter elevator, be ready for a codec during the load
B1 2nd Visit
Our second visit to B1 is slightly longer sneaking past guards to the surveillance center, taking the C4 and Nikita from the armory and then moving further down to B2 for the final showdown.
South Corridor Visit 2
Mess Hall Visit 2
E/W Corridor Visit 2
Skip the codec
After opening the door, take a quick picture of the guard
equip chaff (one tap up), throw a chaff grenade
Hug the wall as you round the corner to avoid getting shot
Restrooms Visit 2
USE PHONE NOT WII CONTROLLER
Equip SOCOM after approaching the lasers (two taps down) and shoot the sensor, switch to camouflage (one tap up)
Sleeping Quarters Visit 2
Central Corridor Visit 2
Access Control Room
Observation Area
Skip the codec, then enter the Observation Area
Interact with the node, skip the codec, then play Interference 3
Skip codec after 100% download, then skip the cutscene
Game will load, continue to mash to skip the cutscene
Game will load again, skip one more cutscene, then skip the codec
When you reach the door, you will skip another codec
Head back south towards the armory
Access Control Room Visit 2
Hold down when the load is complete, tap left to enter the first door without slowing down. The guard will notice you but not be alerted! Example
here
Central Corridor Visit 3
Armory Visit 2
USE PHONE NOT WII CONTROLLER
Switch to SOCOM
Go down and to the leftmost door
Take out the sensor when you open the door, re-equip chaff, then pick up the nikita and C4.
Return to the Central Corridor
Central Corridor Visit 4
Access Control Room Visit 3
Hold up when the load is complete, you will reach the Observation Area before HQ responds. Example
here
Observation Area Visit 2
B2
The final floor change has us use the nikita to get access past the lower storage, meet two guards in a hallway and finally facing the commander on top of the Metal Gear Rex in the final showdown of this game.
Lower Storage
Skip cutscene upon exiting, then skip the codec
Approach the vent as closely as possible
Make sure to leave plenty of room for the nikita to turn, it is very easy to hit walls!
There are three sensors to destroy, all are in the next room. One is in the backleft, one on the left after the corner by the vent, and another past that one in the same direction. See map for more details
After destroying the final sensor, hold right to move before the cutscene begins. Skip the cutscene, then skip the codec
Head into Engineering, equip chaff grenades if you want to be safe.
Engineering
Skip the codec, then enter the Control Room
Hug the west wall, sometimes turret will shoot you. If you want to be safe, use a chaff grenade.
Old Store Room
Mash center/5 to climb boxes
Equip C4 (3 taps up or down) and lay it down by the metal part, make sure to stand back!
If you move quickly and approach the door from the bottom edge, you can exit the room and skip the codec.
Engineering Visit 2
Hangar Access
Skip the cutscene, then skip the codec
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After interacting with the elevator panel, get ready for a codec
Boss: Commander
Emulator Variant
Phone Variant