A grid-based logic puzzle
Color each cell black or white… and give your brain a workout.
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Column transition / Row transition
A square wave with a number in a square above a column tells how many color changes (transitions) must appear in that column. Each step of the wave is one change; a flat wave with 0 means the whole column is a single color.
A square wave with a number in a square beside a row tells how many color changes (transitions) must appear in that row.
This line must have three transitions from black to white or white to black. As it has 4 cells, there must be a transition between each cell
The same principle applies to this column.
This row must have no transition at all so all its cells have the same color.
This line must have 1 transition. We don't where it will be but the line ends with a black cell so it must start with a white cell.
