My entry for the 40th ludum dare.
Linux:
pip3 install pygame
python3 game.py
Windows:
Download and install 32-bit Python 3.2 (https://www.python.org/download/releases/3.2.5/ "Windows x86 MSI Installer (3.2.5)")
Download and install Pygame (http://www.pygame.org/download.shtml)
Double click game.py to run the game.