Only You Can Save the Universe vs. Planiverse

I know, I know, I'm a bit behind. What with work and the discworld novels I just got to Pratchett's Only You Can Save the Universe. While it is clearly very different, it reminds me very much of The Planiverse by A.K. Dewdney. I love Pratchett's writing. I laugh out loud, I think, I cry. But The Planiverse? That was something altogether amazing. Hard to get your hands on anymore, but if you can, do. The whole concept of a conversation with a two-dimensional universe in what I'll call the early days of computing (I know, I know, computing started before the early 1980's, but still, compared to today, it was the "early" days).