4th edition of volume I of the "Calcudoku Advanced" book
This one just came out:
https://www.amazon.com/Calcudoku-121-Ad ... 1536973068It was time to bring volume I "in sync" with volumes II and III: same publisher,
cleaned up layout and rendering of puzzles, the explanation and example chapters,
updated links, etc..
This 4th edition has 20 new puzzles (with exponentiation, without operators, with
exponentiation and zero, and with negative numbers), so it now also has 121 puzzles.
The new puzzles can't be submitted for points on the site (I didn't want the "completists"
to feel they had to buy a book for only 20 new puzzles
)