DOS Games

Upon the recommendation of Tami I tried to find some old DOS games that I used to play before real computers were invented. While I found Pac-Man, I still can't find two that I want. My favorite was the one with aliens that were in a 9x9 block that came down until you shot them all. Only problem is, I have no idea what it was called. I also liked the block game that was like Pong, only you try to break away the little rectangles above the base with a little ball that bounces. Does anyone know what I am talking about? And what were their names?