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Area Reload Wrong Warps
The principle is quite simple: In Metal Gear Solid cutscenes are rendered in realtime, meaning the game actually loads the level it is currently displaying and you can warp to that location in a playable state using the area reload cheat. For now this option is only possible on the PC version using the F7 cheat key.
Applied use cases:
Faster Cell Fight Start
Warp to Rex Layer
You can teleport from ninja to Rex lair during Otacon's cutscene talking about Metal Gear Rex. Then trigger the lost PAL key cutscene, and you can insert the Normal PAL key. Sadly the journey stops after that since you can not continue forward as the doors require level 6 - but Snake only has the level 3 door card yet.