To download Sudoku to your Casio fx-CG calculator:

Connect your calculator to your computer.
Copy Sudoku.py to your calculator.

If you haven't already, install PythonExtra to your calculator.
To install PythonExtra, go to https://www.planet-casio.com/Fr/forums/topic17202-1-beta-pythonextra.html.
Download PythonExtra by clicking the PythonExtra.zip link near the top of the post.
Copy the PythonExtra file to your calculator. 

You're all set. To access the game, open PythonExtra and navigate to the Sudoku file.

Tip: Placing the Sudoku file inside a folder named something like "AGames" will allow for faster access from the menu.
