DOS Games: Sidescroller
Commander Keen Episode Four: Secret of the Oracle
Maker: Apogee & ID Software
Size: 712 KB
This is one of my favorite DOS side-scrolling games of all time. You control Commander Keen, once again armed with a pogo stick. Travel through tons of different levels, fending off alien monsters of all kinds. There are also many settings in this side-scrolling DOS game, including cave, winter, and jungle. After you complete each level, you return to the main map, where you can see all the levels that you need to beat, and all the terrains in those levels.