In order to run the games offline (if they don't require an active Internet connection), you need to create a local server.

1. Follow this guide to install Python. Remember to choose "Add Python to PATH".

2. Open command prompt by clicking the Start button (or pressing the Windows key + R), then type cmd.
(Or install Windows Terminal from Microsoft Store and search it in the Start menu on Windows 10/11.)

3. Visit this link to download.

4. Extract the ZIP file to your favorite location, and copy/remember that location for the next step.

5. Back to command prompt. If the location is in the same drive as what's shown on the screen (C:\ for example), just type cd [your location here]. Otherwise, you need to type an extra command, [drive name here without "\"]. Example:

6. Enter python -m http.server. Wait until it shows Serving HTTP on :: port 8000 (http://[::]:8000/) ... (the port number may vary).

7. Visit http://localhost:8000 (default) on your browser. It should be working now.