Pitch Black
(Published on 29. June 2025, 18:20 by PhenixDe)
Normal sudoku rules apply: place the numbers 1-9 into the grid so they appear in each row, column and 3x3 box exactly once.
Each cell in the grid should be coloured either blue (for water) or green (for land).
Water cells form a single, orthogonally connected region in the grid.
No 2x2 area can contain only water cells.
An island is an orthogonally connected region of at least 3 land cells. Every land cell in the grid is part of an island.
Islands may touch diagonally.
The digit in a cell containing an arrow shows how many cells share the same colour with the cell in the given direction, not including the cell itself.
Cells pointed by an arrow are not necessarily next to each other.
Not every possible arrow is given.
Land cells forming an island must have different values.
No two orthogonaly adjacent digits are consecutive, nor in a ratio of two to one.
Link to play: sudokupad.app/bg3bmd9v2n
The ruleset used in this puzzle has been invented by matt383.
Each cell in the grid should be coloured either blue (for water) or green (for land).
Water cells form a single, orthogonally connected region in the grid.
No 2x2 area can contain only water cells.
An island is an orthogonally connected region of at least 3 land cells. Every land cell in the grid is part of an island.
Islands may touch diagonally.
The digit in a cell containing an arrow shows how many cells share the same colour with the cell in the given direction, not including the cell itself.
Cells pointed by an arrow are not necessarily next to each other.
Not every possible arrow is given.
Land cells forming an island must have different values.
When at nightfall, I looked at the sky for guidance.
An empty void stared back. No stars, only blackness.
An empty void stared back. No stars, only blackness.
No two orthogonaly adjacent digits are consecutive, nor in a ratio of two to one.
The ruleset used in this puzzle has been invented by matt383.
Solution code: Blue cells of rows 4, 5, and 6, with a '!' between each row
Last changed on on 30. May 2026, 14:28
Solved by PierreTombal, zeniko, ZornsLemon, Snookerfan
Comments
on 1. June 2026, 14:06 by Snookerfan
Insane as in brilliant! Thanks
on 30. May 2026, 14:28 by PhenixDe
added a link to sudokupad
on 30. June 2025, 17:41 by PierreTombal
A lot trickier than I expected. Opening was pretty smooth but it has a nasty bite towards the end.
on 30. June 2025, 16:06 by ryba
SudokuPad with no solution check - https://sudokupad.app/t64tl0f1fk
on 29. June 2025, 21:16 by Mattisahuman
Where’s the link to play?
on 29. June 2025, 18:23 by zonny
link?
