Invisible Arrows
(Published on 27. April 2025, 16:04 by Md88keys)
by Md88keys
Play in Sudokupad
Normal Sudoku rules apply.
Counting Circles: A digit in a circle indicates the number of circles which contain that digit.
Arrows: The digit in a circle also equals the sum of the digits on the attached visible or invisible arrow.
The given arrows are visible arrows. At least one visible arrow points to each unique circle digit. Circled odd digits have an even number of visible arrows. Circled even digits have an odd number of visible arrows.
Circles without a given arrow have at least one invisible arrow, connected cells which sum to the digit in the circle.
Invisible arrows may share cells with other visible or invisible arrows, however, the same cells may not point to two different circles with the same digit. (For example, three cells 1-2-4 could point to only one 7, but four cells 1-2-4-1 could contain separate invisible arrows pointing to separate 7s.)
Circled digits may appear on an invisible arrow.
All arrows, (visible and invisible), contain at least three cells.
Digits may repeat on any (visible or invisible) arrow, but an arrow may not revisit a cell.
Solution code: Row 7
Comments
on 27. April 2025, 19:09 by Md88keys
I'm sorry Big Tiger, let me see if I can clarify.
Every circle is both a counting circle an arrow/circle.
After creating the puzzle with every circle having an arrow of at least three cells, I erased most of the arrow lines. I left at least one arrow line for each unique circled digit.
Odd/even example: if there is a digit 8 circled, then there is one, three, five, or seven visible arrows pointing to circled 8s
on 27. April 2025, 18:40 by Big Tiger
I am totally lost on these instructions.
