I don't think puzzle 26 is unique. Unless I'm thick, the initial column could decrease instead of increase, and the solution is still valid?
It looks like there was an update for 26, but it's not in the current PDF?
You're right. I'm very sorry.
Yesterday, I found some puzzle have multiple solution, so I'll update ASAP.
Currently, 26, 27, and 2nd book's 4, 5 have multiple solution.
Thank you for your feedback, and again, I’m sorry for the confusion.
