Quoting Bob's post at the zx81 forum:

"My second game for the 16K ZX81 - VIRUS - is now finished, and can be
downloaded from my site http://www.bobs-stuff.co.uk or using this link
http://www.bobs-stuff.co.uk/extras/virus.zip.

It's a top-down scrolling arcade/adventure/shoot-em up in the style of
the 8-bit classic 'Into The Eagles Nest'.

Hope you like it."

On Sat, 17 Apr 2010 02:18:27 -0700 (PDT) da kidz on comp.sys.sinclair were rappin'
to MC zxbruno:

> Quoting Bob's post at the zx81 forum:
> 
> "My second game for the 16K ZX81 - VIRUS - is now finished, and can be
> downloaded from my site http://www.bobs-stuff.co.uk or using this link
> http://www.bobs-stuff.co.uk/extras/virus.zip.
> 
> It's a top-down scrolling arcade/adventure/shoot-em up in the style of
> the 8-bit classic 'Into The Eagles Nest'.
> 
> Hope you like it."

Haven't tried the finished version yet, but I played one of the
earlier builds and really enjoyed it.  It's one of the best ZX81 games
I've played, if this had come out in 1982 it would have been a big
hit I'm sure.

Chris


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DISCLAIMER: I may be making all this stuff up again.

at first I thought perhaps you meant a ZX81 version of zarch/virus, any one 
up to it? :-)