....
These are FREE:
Python Download: https://www.python.org/downloads/
Python/Pygame install YouTube tutorial: https://www.youtube.com/watch?v=AdUZArA-kZw
Game Information file included.
UPDATE 26 Sep: Spycrab Invaders 3 notes look good (https://sourceforge.net/p/spycrab-invaders/discussion/general/thread/b6c49ee11e/). Just need to to start!