Petri Laarne is a user on mathstodon.xyz. You can follow them or interact with them if you have an account anywhere in the fediverse. If you don't, you can sign up here.

If you fancy a bit bigger but not too difficult , I just published a on my blog! I promise it’s much easier than the Magazine one.

nollakohta.fi/2018/05/kesa-luk

Petri Laarne @petrilaarne

Correction: 18D should read ”Each digit is the last digit of twice the preceding digit”. Thanks @christianp for spotting this! (And very ace to solve a puzzle with an error in it 😎)

I’ve now updated the original post with a solution. Hoping that we found the same one!