Theseus ep. IV?

I came across a youtube movie of a version of Theseus for MSX which is different to the original cartridge version.
This one is supposed to be a super difficult version, and I think it came with a magazine, as a code listing or a tape or something.
Have anyone played it?

Nice topic!

I actually interviewed the guys behind these two games (Theseus and Illegus). I was searching for the best romanisation of Illegus when I came across this topic.

I'm going to send some follow-up questions via email - anything anyone particularly wants asked? Questions for the programmer of Illegus (Ep IV) need to be in Japanese. I can have them translated, but if you can post in Japanese it will save me some time.

Cool, I have an original Illegus (unfortunately, without box), but Theseus is a really cool game

Oh, wow, what the hell? That is quite fascinating. :o
It's almost like an entirely new game, or at least a true sequel.
Thanks for showing this.

Are these new levels / modified levels or is it just the regular game starting at an advanced level ?

More important, where can we find it ? :)