Setup and opening position
The grid starts undecided with visibility numbers recorded for the white cells of a deterministic target pattern. Each number counts its own cell and visible white runs.
Range Puzzle
Match every positive visibility clue exactly and keep all black cells separated from other black cells along shared edges.
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How to play
Match every positive visibility clue exactly and keep all black cells separated from other black cells along shared edges.
- The grid starts undecided with visibility numbers recorded for the white cells of a deterministic target pattern. Each number counts its own cell and visible white runs.
- Mark an editable cell white or black, or clear it. Visibility travels from a white clue in the four cardinal directions until the grid edge or a black cell stops it.
- Match every positive visibility clue exactly and keep all black cells separated from other black cells along shared edges.
Strategy tips
- Large clues force long white runs, while a clue already reaching its total needs black boundaries just beyond the confirmed visible cells when those positions exist.
- Diagonal white cells do not contribute to a range number, and placing two black cells edge-to-edge is illegal even if the visibility totals appear correct.
- Recalculate each remaining clue across both its row and column, counting the clue cell once, then use the black-separation rule to resolve the final ambiguity.
Complete guide
Rules, scoring, and strategy
Range Puzzle is a complete browser implementation with its own versioned rules profile. Shade cells in a three-by-three grid so every numbered white cell sees its stated contiguous horizontal and vertical range while black cells never touch orthogonally.
Legal moves and game flow
Mark an editable cell white or black, or clear it. Visibility travels from a white clue in the four cardinal directions until the grid edge or a black cell stops it.
Winning and terminal positions
Match every positive visibility clue exactly and keep all black cells separated from other black cells along shared edges. Recalculate each remaining clue across both its row and column, counting the clue cell once, then use the black-separation rule to resolve the final ambiguity.
Practical strategy
Large clues force long white runs, while a clue already reaching its total needs black boundaries just beyond the confirmed visible cells when those positions exist. Diagonal white cells do not contribute to a range number, and placing two black cells edge-to-edge is illegal even if the visibility totals appear correct.
Questions players ask
What is the objective in Range Puzzle?
Match every positive visibility clue exactly and keep all black cells separated from other black cells along shared edges.
Which moves are legal in Range Puzzle?
Mark an editable cell white or black, or clear it. Visibility travels from a white clue in the four cardinal directions until the grid edge or a black cell stops it.
What should I plan first in Range Puzzle?
Large clues force long white runs, while a clue already reaching its total needs black boundaries just beyond the confirmed visible cells when those positions exist.