Logic Masters Deutschland e.V.

3H: Tritium

(Published on 11. September 2026, 01:02 by RightHandedNeutrino)

This is the third of three 'simpler' Still Life puzzles that do not feature other rules or variants, and were inspired by Metroid. If you haven't yet, consider solving the first puzzle Protium and the second puzzle Deuterium!
More puzzles using this ruleset were popularized by Kafkapharnaum and Sktx.
Check out the complete list of all the Still Life puzzles!

Rules:

Normal sudoku rules apply
Place the digits 1 to 9 in each row, column, and 3x3 box.

Still Life

Shade some cells green ("live cells") such that the – up to – eight cells neighboring each green cell contain exactly 2 or 3 other green cells and the neighbors of each 'unshaded' – or grey – cell ("dead cells") do not contain exactly 3 green cells
– A CIRCLED cell's digit indicates the number of cells that are in the SAME state as its own in its neighborhood, INCLUDING its own cell
– A SQUARED cell's digit indicates the number of cells that are in a DIFFERENT state from its own in its neighborhood (therefore not including its own cell)
Not all circled and squared cells are necessarily given.

Play the puzzle on Sudokupad

Solution code: Digits in live cells in column 3 (read top to bottom) followed by digits in dead cells in row 7 (read left to right)

Last changed on -

Solved by Zzzzz..., Hellolol, oiyad, Katuize
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Comments

on 12. September 2026, 01:10 by Hellolol
Great puzzle. In my opinion 4.5 stars and it’s a great (yet simple) still life.

Difficulty:5
Rating:N/A
Solved:4 times
Observed:0 times
ID:000UTA

Variant combination Shading puzzle

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