Draw on Edges: ON Panel: OFF

     

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DOPPELGANGER
– Every row, column, and box contains the digit 0 always, as well as eight out of the nine digits from 1 to 9 (ie, it's missing one digit that is not 0)
– No two row, no two column, and no two box may be missing the same digit
– For each 0 in the grid, the digits missing in its row, its column, and its box must be three different digits (and note that a zero always acts as itself – ie, the lowest possible value – regardless of what digits it's replacing in its box, row and column)

SPIRAL GALAXY
– The dots in the grid are the centers of non-overlapping, 180 degrees rotational symmetric galaxies. Each cell of the grid is part of a galaxy (1x1 galaxies can be valid, but they must have a center)
– Galaxies are made of a series of non-repeating consecutive digits in any order
CTRL + z CTRL + y Erase elements that belongs to the selected mode Erase problem or solution grid

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Mode: Number

  • 1
  • A
  • a
  • Text