RNDr. Jiří Jarník, CSc. is basically a co-author with all these “(pozn. překl.)” and I think they greatly improved it. I don’t think there’s any other translation of the book, so I’d say the ultimate version is Czech. It’s on my bookshelf too, no need to find scans online.

Here’s a fun question from the book, shortened and adapted for modern typesetting:

Jméno kterého matematika se skrývá v rébusu?
^πr
Řešení: https://cs.wikipedia.org/wiki/%4A%6F%68%6E%5F%4E%61%70%69%65%72