contains 4 homebrew games:1) an arkanoid clone2) a Centipede clone (this one doesn't work for me, won't start)3) a pac-man clone4) a block game (like that one made by the russian guy)non of the games have audio.
With schematics on the other hand; while it can be difficult to read through, you'll get the gist of things once you find which component is needed to be replaced.