This project's only dependency is SDL2.

To install dependencies, the following commands should work, based on your system.

sudo apt install libsdl2-dev libsdl2-ttf-dev
make
./sudoku
make clean

sudo pacman -S sdl2 sdl2_ttf
make
./sudoku
make clean

Please download sudoku.zip from releases, unzip and run sudoku.exe.

Navigate the menus and game with arrow keys, or hjkl.

Select the menu item with enter.

Use N or 0 to toggle note mode.

1-9 to fill in a note/cell.

Backspace to clear a cell.

Esc to exit the game.

Computer generation is implemented using Knuth's Algorithm X.

Difficulty sets the number of filled-in cells in the puzzle.

Based on the difficulty, the puzzle is randomly picked from a list.

Many thanks to grantm's Sudoku exchange puzzle bank.

These puzzles are graded, so they should more closely match the selected difficulty.

(But you should definitely use my computer-generated puzzles.)