To be fair, it’s a non-specific “Tap Code” that’s been used for hundreds of years. So, I guess if you’ve ever been a POW you wouldn’t need the decoder from the manual,
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I played through the msx one on my Vita when we did our Metal Gear episode earlier this year. Really enjoyed it, and playing it on a portable with sleep mode is a big plus, as I could find a lot of time to sneak in game time here and there.