Bird's Eye
(Published on 1. December 2025, 16:32 by Jooshy)
Rules:
- Normal sudoku rules apply.
- Bird's eye arrows: If a cell contains a number N and has a bird’s eye arrow, then the cell N spaces away in the arrow’s direction must be greater than N, and all the cells in between must be smaller than N. For example, if r9c2 is a 4, then r9c6 must be greater than 4, and r9c3, r9c4, r9c5 must all be smaller than 4.
- Killer cages: Within each cage, digits do not repeat and must sum to the value in the upper-left corner (if given). Every killer cage has a different size.
- Dynamic fog: The grid is partially covered in fog. Entering correct digits may clear fog somewhere in the grid. No guessing is required.
Solution code: Column 9, from top to bottom.
Comments
on 20. December 2025, 00:54 by grrz
Elegant rules and clever layout. I enjoyed it from start to end. Thank you Jooshy!
on 5. December 2025, 15:22 by Jooshy
Changed wording of 'Every killer cage has a different length.' to 'Every killer cage has a different size.'
on 5. December 2025, 11:30 by hurrdurr
Lovely puzzle!
I did have the same confusion as one of the commenters below, perhaps switching out the word 'length' for the word 'size' would make it less ambiguous.
on 1. December 2025, 21:57 by Cantabrigiensis
Great puzzle, really enjoyed it; thank you very much!
on 1. December 2025, 18:57 by Marshal on Mars
Is the word "length" in referring to cages meant to convey that all cages are a 1-cell-wide path? Or is it just saying "size"/"number of cells"?
edit: Nevermind, went ahead without assuming that and it still solves uniquely without the assumption.
