X-Sums: A circled number outside the grid is the sum of the first X digits looking in from that position, where X is the first digit encountered.
Progressive Divisors: The X-digit number forming the X-sum is a progressive divisor number - for each N up to X, the number given by the first N digits is divisible by N. (So, for instance, 4896 would be a valid fill for a 27 clue, since 4 is divisible by 1, 48 is divisible by 2, 489 is divisible by 3, 4896 is divisible by 4, and the digits sum to 27.)
f-puzzles: https://f-puzzles.com/?id=y3xljedo
CTC: https://tinyurl.com/yeyr53ap
Solution code: Row 3 + Column 4 (18 digits)
on 13. May 2022, 04:39 by Dermerlin
very nice puzzle. Was easier than i had expected. 2 stars looks correct to me.
on 13. May 2022, 04:27 by Dermerlin
to me it's not obvious, whether a number on the right border of the grid is read from right to left or left to right (for the divisible check)
-It's always read from the position of the clue. -SSG
Thx for fastest answer ever !
on 9. May 2022, 23:12 by steelwool
Nice gentle intro, not done one of these before, thanks.