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Didn't realize how hard MGS4's Disc Swap joke hit until I backed it up
(programming.dev)
Vintage gaming community.
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I think the commander dude gives you hints if you keep losing a particular fight though. He'll get explicit about the trick for Psycho Mantis!
You have to pester the colonel on the codec like 3 or 4 times until he gives the idea to plug the controller on slot 2. The first few times I got past Mantis thanks to infinite ammo and health, brought to me by Gameshark 🦈. If you keep shooting the FAMAS, a shot will occasionally hit Mantis. He dodges explosions, so Grenades, Nikita and Stinger don't work.