This demo (3 playable levels) version of the 6th episode in the popular Commander Keen series continues the adventures Keen began in the 4th episode of the series. The engine and most of the enemies, powerups, etc are the same, except with all new level designs. Since the basic game is the same, if you enjoy the other Keen games, you'll probably like this one. If you're new to the series, this is a good place to start. (Although there are only three levels in the demo; try Commander Keen 4: Secret of the Oracle for a complete game wuth the same style.)