On the subject of this game, a truly classic precursor to the platform world we know now, it was recently remade for the Oric-1/Atmos machines. The Oric-1/Atmos were classic 8-bit systems which had a life of only 2 or 3 years during the height of 8-bit computing in the 80's, competing against the majors (C64/Amstrad/Spectrum/etc.) and not doing so well, alas. They were but a glitch in the 8-bit matrix.

It has been pretty neat to see the revival of the machines in the last two decades - and the scene that is producing new titles for the machines are pretty neat folks: computing purely for the love of it, producing titles of such brilliance that one could only have wished it happened 30 years earlier.

So I always like to mention it when the opportunity presents itself - if you want to play Impossible Mission, ported as a labor of love by very brilliant coders to an obscure/completely different platform than Javascript/web entirely, you'll need Oriculator:

https://code.google.com/p/oriculator/

.. and the Impossible Mission .TAP file:

http://im.defence-force.org/

"Stay awhile! Stay FOREVER!!!! Hahahaha ..."

(More great Oric titles, along the lines of the 80's classics like IM and more, available here:

http://www.oric.org/index.php?page=software&fille=top150game...

If you love Impossible Mission, check out SPACE 1999, SKOOL DAZE, DON'T PRESS THE LETTER Q, and more!)