THE COUNTING COLLECTION / 01

InkpatchMosaic Studio

A little ink. A little deduction. Every square belongs.

Choose a study

Start with a zero clue: its entire neighborhood is paper.

Nine squares, one clue

Each number counts ink squares in its 3×3 neighborhood, including its own square. At an edge, count only squares inside the board. A clue may be ink or paper.

Mark every square: dark ink ■ or pale paper ×. A green ring means a clue is complete; a coral ring means it cannot work.

Pointer: tap to cycle unknown → ink → paper, or pick a tool. Right-click marks paper.
Keyboard: arrows to travel; I / X ink, O / B paper, Delete erase, Space cycle, Z undo.

15 original-engine studies · 5×5, 7×7, 9×9 · Progress saved on this browser · Hints may reveal an assisted square.

Adapted from Simon Tatham’s Mosaic, by its contributors.
MIT source and attribution in LICENSE.txt · GitHub source