Nonogram Sketch

It is a Nonogram puzzle going one by one resolved out carving a large image.

To complete the whole picture, you may solve nonogram puzzle one by one.

- [O] button: Find the square Touch or drag.
- [X] button: Touch or drag, you can search for empty space.
- [Erase] button: I will erase the O and X.
- [Undo] button: I will restore the O and X to its previous state. I will remember before the 20 times.
- [Tips] button: looking for something square.
- When you exit the game, even out on the map, will the current state is "auto-saved".