Puzzle Grid — Open Source Notes App

An app for drawing and filling in selected puzzle grids on your phone/tablet, to avoiding having to write on public papers, or for if you only briefly have access to the puzzle.

Supports Crossword, Sudoku, and Battleship grids.

For Crossword grids:
* Draw a grid with any rectangular dimensions;
* Use common symmetries to quickly draw the grid;
* Load clues into the app as an image;
* Highlight clues in the image so that they can be visible alongside the grid;

For Sudoku grids:
* Undo actions;
* Ghost mode allows you to test solutions without overwriting the cells you are confident in;
* Automatically check for repeated numbers;

For Battleship grids:
* Draw a grid with any rectangular dimensions;
* Undo actions;
* Ghost mode allows you to test solutions without overwriting the cells you are confident in;
* The app keeps track of how many boats of each length you have and how many segments in each line;

For all grids:
* Save and load partially filled grids to return to later;
* The option to autosave allows the grid to be stored for when you next open the app;