How to get the blue key on PSX Final Doom level 8, Minos:

The blue key is located on a low, square platform in the
middle of a large, squarish pool of green slime.
You can Run to this platform from another platform to the
north of the blue key.
In PSX Final Doom, the default Run button is the Square
Start in the middle of the north platform, and face south
towards the blue key.  Hold down the Square button, and
press the up arrow to Run towards the blue key.  With a
little luck, you will jump the gap and land on the blue-key
If you miss, run back around to the north platform.  Stairs
extend up from the slime to the top of the north platform.

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