Nonograms Katana for Android

10 things about Nonograms Katana

1. Nonograms, also known as Hanjie, Griddlers, Picross, Japanese Crosswords, Japanese Puzzles, Pic-a-Pix, "Paint by numbers" and other names, are picture logic puzzles in which cells in a grid must be colored or left blank according to numbers at the side of the grid to reveal a hidden picture.

2. For example, a clue of "4 8 3" would mean there are sets of four, eight, and three filled squares, in that order, with at least one blank square between successive groups.

3. Determining which cells are to be left empty (called spaces) is as important as determining which to fill (called boxes).

4. Later in the solving process, the spaces help determine where a clue (continuing block of boxes and a number in the legend) may spread.

5. The numbers are a form of discrete tomography that measures how many unbroken lines of filled-in squares there are in any given row or column.

6. To solve a puzzle, one needs to determine which cells will be boxes and which will be empty.

7. Solvers usually use a dot or a cross to mark cells they are certain are spaces.

8. Only cells that can be determined by logic should be filled.

9. If guessing, a single error can spread over the entire field and completely ruin the solution.

10. It is also important never to guess.