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.

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.

• 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

• 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

• NO CODEC OR CUTSCENE
• Climb stairs and head west

• 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

• Aim for the lines as you tap up and down

• After interference, there is a codec, completion of download, then another codec
• Run straight for the exit

• Skip codec, then go to the E door on the 2nd level

• Hug the outside wall as you go to the N door

• Skip the cutscene, then skip the codec
• Toss a chaff after you round the corner past the guard

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.

• Skip the cutscene, then skip the codec
• Take the southern route to the door

• Skip the cutscene, then skip the codec
• Go immediately east then up past the cafeteria table

• Skip the codec
• Toss a chaff before the camera

• Enter the E bathroom, careful not to run into the stall
• Mash Center or 5 as you approach the vent

• Skip the codec
• It's possible to make the guard notice you but not see you at the lockers by going north then west
• Example of fast strategy with radar
• If guard notices you, tranquilize him instead

• Take the first door on the east

• 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

• Approach the bottom ledge and mash center/5 to climb
• Pick up chaff by door on way out

• Skip the codec
• Exit at the southern door

• 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

• Aim for the lines as you tap up and down

• 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

• Skip codec after floodlight on wall

• Interact with elevator panel

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.

• 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

• Skip the cutscene, then skip the codec
• Head East, take the turret damage

• 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

• Hug the rail on right to only get shot by the turret once

• 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

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.

• Skip the codec then enter the Mess Hall again

• Skip the codec and repeat the Mess Hall movement

• 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

• USE PHONE NOT WII CONTROLLER
• Equip SOCOM after approaching the lasers (two taps down) and shoot the sensor, switch to camouflage (one tap up)

• Run past the guard and throw a chaff
• Alternative quick shoot the guard with the M9 once

• Take furthest door on the right

• Skip the cutscene, then skip the codec
• Run through the door in the east past the cameras

• Skip the codec, then enter the Observation Area
• Interact with the node, skip the codec, then play Interference 3

• Aim for the lines as you tap up and down

• 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

• 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

• If you want safety or are still learning the game, switch to the M9 and tranq the guard when you round the corner. Afterwards, toss a chaff grenade to disable the camera.
• If you want to play risky and save the M9 menu and ammo, follow this movement

• 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

• If playing risky, toss a chaff immediately and move! You will round the corners as tightly as possible. Example here
• If safe, the pressures of moving optimally aren't there

• Hold up when the load is complete, you will reach the Observation Area before HQ responds. Example here

• Use the elevator on the east side

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.

• 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.

• 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.

• 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.

• After shooting the sensors with the SOCOM, switch to the M9 before the next room

• Skip the cutscene, then skip the codec
• Suggested FPV Flick Strategy
• Risky Crate Rotate Strategy
• After interacting with the elevator panel, get ready for a codec

• After the elevator lands, skip the cutscene

Non-Lethal Example by Plywood

• After defeating the Commander, IGT ends when credits begin - Mash the action buton so the “Error” screen moves over to credits as soon as possible.

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