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Logic & Puzzles

KEEP CALM AND FILL THE SQUARES

Tap a square to cycle 1 to 4

KEEP CALM

Free forever. No signup, no install, no ads.

How to play

  • Every row, every column and every two by two box has to hold 1, 2, 3 and 4, one of each.
  • Tap an empty square to step it through 1, 2, 3, 4 and back to blank. The numbers the puzzle came with cannot be changed.
  • A number that clashes with another one in its row, column or box turns a warmer color.
  • On a keyboard, arrows move the outline, space steps through the numbers, and the 1 to 4 keys set one straight away.

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