**//Boss Survival//** is a game mode where the player fights through all the bosses in the game consecutively.

Unlocks with a completed savefile. For links to completed savefiles and the developer save, check the [[https://metalgearspeedrunners.com/wiki/doku.php?id=mgs2_resources|MGS2 Resources]] page.

======General Information======

  * Can be played on Sons Of Liberty (with exception to NTSC-U), Substance, and the HD Edition.
  * Difficulties somewhat follow the Sons of Liberty NTSC-J naming convention:
    * "Easy" = Very Easy from most versions.
    * "Normal" = Easy from most versions.
    * "Hard" = Hard from most versions.
  * Extreme can only be accessed using the developer menu.
  * Final Score Screen time is always one or two frames less than what the player sees after the final hit on Solidus.
  * HD Edition increased the time it takes for grenades to blow up, therefore Stun Grenade strategies for the Tengu fights might differ a bit.
  * Load times, lag, and pausing the game using start do NOT count towards the in-game timer.
  * Menu-ing weapons and items do count towards the in-game timer.
  * Optimal strategies for boss fights in the main game does NOT always translate well to Boss Survival.
  * PAL50 should run at a lower framerate, therefore should result in a worse final in-game time.
  * Sons of Liberty (NTSC-J) has a slightly faster Solidus since you can hit the walls with the blade, cancelling the animation halfway through.
  * The boss fights on Sons Of Liberty and Substance Xbox NTSC-U include: 
    * Olga, Fatman, Harrier, Vamp, MG-Rays, and Solidus.
  * The boss fights on Substance and HD Edition include:
    * Olga, Guard Rush, Fatman, Harrier, Vamp, Tengus, MG-Rays, and Solidus.
  * Two playable characters: Raiden and Snake.
  * Tengus can NOT be skipped using the Door Glitch, but can be skipped using the Coolant/Choke/Stun skips.

^Difficulty^Number of Guards^Number of Tengus^
|Easy      |4 + 3           |20              |
|Normal    |5 + 3           |22              |
|Hard      |8 + 3           |25              |
|Extreme   |8 + 3           |25              |

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