GameMaker is a program designed to help people make their own games.

Here are some links:

Game Maker Page - http://www.yoyogames.com/make

Student made video on getting started - http://www.youtube.com/watch?v=dYAK6S4HcH0

Resources for High School students using Game Maker - http://www.mindtools.tased.edu.au/gamemaker/default.htm