How to get the blue key in PC TNT level 05, HANGER:

The blue key sits on a platform.  The side of the platform
that faces into the room is a blank gray rectangle.  Walk
up to that blank gray rectangle and Activate it like a
switch.  You'll hear a machinery noise; that is the sound
of a low pedestal dropping into the floor directly behind
you.  Quickly Run backwards away from the blue key until
you step on that lowered pedestal.  When you step on it,
the blue-key platform will drop down.  Quickly Run forward
and grab the key.

PC TNT players can click here to access a demo that shows
how to get the blue key on this level.

Hope this helps. :)                                      

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