Nonograms Katana

Nonograms Katana
Android: https://play.google.com/store/apps/de...
iOS: https://itunes.apple.com/app/id103771...
Play in a browser: https://nonograms-katana.com

Nonograms Katana: Sharpen your mind!

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. 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. 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.
To solve a puzzle, one needs to determine which cells will be boxes and which will be empty. Determining which cells are to be left empty (called spaces) is as important as determining which to fill (called boxes). Later in the solving process, the spaces help determine where a clue (continuing block of boxes and a number in the legend) may spread. Solvers usually use a dot or a cross to mark cells they are certain are spaces.
It is also important never to guess. Only cells that can be determined by logic should be filled. If guessing, a single error can spread over the entire field and completely ruin the solution.

Features:
1001 nonograms
All puzzles are free
All puzzles tested by computer program and have unique solution
Black-and-white and colored
Nonograms sorted by groups from 5x5 to 50x50
Download puzzles sent by other users
Create and share your own puzzles
15 free hints per puzzle
Use crosses, dots and other symbols to mark cells
Auto cross out numbers
Auto fill trivial and completed lines
Auto save; if you stuck you can try another puzzle and come back later
Zoom and smooth scrolling
Lock and zoom number bars
Lock current puzzle state, check assumptions
Customize background and font
Switch day and night modes, customize color schemes
Optional cursor for accurate picking
Undo and redo
Share result pictures
Save game progress to the cloud
Achievements and leaderboards
Screen rotation, as well as puzzle rotation
Suitable for phones and tablets