Based on Liero gameplay, OpenLierox is an extremely addictive realtime worms shoot-em-up backed by an active gamers community. Dozens of levels and mods are available to provide endless gaming pleasure.
This is OpenLieroX 0.58 in a Commander Keen 1 level. Since version 0.58, you can load any Commander Keen 1-3 level if you have the original level files (and CK1 levels can be downloaded anywhere in the Internet for free). Playing some Capture The Flag.