Battleship Prime
(Published on 11. January 2023, 16:46 by SenatorGronk)
- Standard sudoku rules apply
- The grid has 10 ships in orthogonal lines: 1 that is 1x4 cells, 2 that are 1x3, 3 that are 1x2 and 4 that are 1x1. The digits in each ship sum to a different prime number (1 is not prime).
- Diamonds are islands and indicate the combined number of ship cells in their row and column. Ships do not touch islands or each other -- even diagonally.
- Region Sum Lines: Lines have the same sum within each 3x3 box they enter and may include both ship and water cells.
SudokuPad (CtC)
Solution code: Row 2 + Column 1 (18 digits)
Comments
on 8. June 2024, 12:17 by chameleon
Beautiful logic!
on 14. January 2023, 19:49 by henrypijames
"Lines have the same sum" - every line has the same sum in every box, or each line has its own sum that is the same in every box?
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Sorry — normal region sum lines. That is, for each line the sum of the digits within each 3x3 box is the same. Different lines can have different sums. Ex: R1C3 = R2C4 + R3C4 = R4C5 + R5C5
on 12. January 2023, 03:16 by dBass
quite an unusual break-in. i'd say it was pretty hard to unwind
on 11. January 2023, 19:57 by Stingrayy
So that line actually was a clue, interesting ;) I cannot get beyond the initial coloring, not even one pencil mark
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None of the lines are necessary to figure out where the ships go, they're just needed to disambiguate digits down the road, and yeah -- I realized the puzzle could be solved without that fourth line so I removed it. Ping me on the CtC Discord server if you'd like a nudge.
on 11. January 2023, 18:35 by SenatorGronk
Removed superfluous clue
