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+
+# Sudoku Solver
+
+I'm not a fervent sudoku solver but I always wanted to try implementing a program
+to solve the puzzles faster than I can.The program uses Qt 5 for its user interface,
+you will need to have it installed to build or run the program.
+
+## Building
+
+Basic building instructions:
+
+ autoreconf -i
+ mkdir build
+ cd build
+ ../configure --with-qt-includes=/usr/include/qt
+ make
+
+The binary is called 'sudoku' and will be located in the 'src' directory.
+You can run it from within the build directory:
+
+ src/sudoku
+
+## Usage
+
+Running the program will show the main window, which consists of a basic
+9x9 sudoku grid and a number of menu options.
+
+### Game menu
+
+The *New* option will clear the current game
+
+The *Load* option allows you to load a previously loaded game.
+
+The *Save* option allows you to save the current sudoku puzzle to the current file.
+
+The *Save As* option allows you to save the current sudoku puzzle to a new file.
+
+The *Revert* option will reload the current file from disk.
+
+The *Quit* option will close the program.
+
+### Move menu
+
+The *Step* option will try to solve a single random unsolved cell,
+using the sudoku rules only.
+
+The *Guess* option will try to solve a single random unsolved cell,
+and will guess (search) for a solution as required.
+
+The *Solve Rules* option will try to solve the game,
+using sudoku rules only.
+
+The *Find Solution* option will try to solve the game,
+and will guess (search) for a solution where required.
+
+The *Validate* option will verify if the current puzzle is valid.
+
+### Settings menu
+
+* The *Mark solveable* option will, if enabled, mark cells that can be solved without guessing in yellow.
+
+## Save game file format
+
+The file format is extremely simple:
+the files can be opened and edited with a text editor.
+Unsolved positions are saved as well and are indicated by zeroes.
+
+Example:
+
+ 0 0 0 8 0 2 9 0 0
+ 0 0 0 9 0 7 3 6 0
+ 4 0 9 0 0 0 0 0 7
+
+ 0 8 0 0 0 5 0 4 6
+ 1 3 0 0 7 8 0 0 0
+ 0 0 0 2 0 0 0 7 0
+
+ 3 4 6 1 2 0 7 0 0
+ 0 1 0 0 0 0 6 0 2
+ 0 5 0 0 8 0 0 0 0
+
+While the file format is optimized for readability, the program will
+actually ignore extra whitespace while loading a file. This allows you to
+load games from a simple file with a sequence of 81 numbers.
+
+## Algorithm
+
+The constraint solver will try to find a solution by applying
+two sets of sudoko constraints: the sudoku elimination rules,
+where every number from 1 to 9 can only appear once in every row, column and subgrid,
+and the sudoko inclusion rules, where every number has to appear exactly once
+in every row, column and subgrid.
+
+The search solver will apply constraints until there are no cells left with a unique solution.
+From there, it will pick a random unsolved cell, fill it with one of the remaining possibilities
+and recurse into the next iteration.
+
+## Copyright
+
+This sudoku solver was written by Stijn "Ingar" Buys and is available under
+the terms and conditions of the GNU Public License, version 3 or higher.
+