It isn't a joke!
DOOM for the Commodore VIC-20 / Commodore VC-20 (http://www.youtube.com/watch?v=KWIzWntEYcE#ws)
Well, 8 x 8 chars... it is kind of a joke. ;)
impressive considering the limitations of the machine :)
Impressive, now where is the CPC version...
Did you miss it? It was released long before... actually there was a couple of them.