The object of Pyramid Power is to fill in all the cubes that make up the pyramid by jumping onto each one - while evading some hazardous pursuers. The pyramid is 6 cubes wide by 6 cubes high. If you succeed in filling all 21 cubes, you advance to a new level.
Pyramid Power was written by Mike Lightstone and published as type-in source code in Compute! Issue 77, October 1986. It requires a joystick.