DOS

Commander Keen 2: The Earth Explodes

Trivia

Unlike the first and the third episode Commander Keen 2 doesn't have a secret level as the creators thought a secret level on the map of the mother ship didn't feel right.

The Earth Explodes is the second of three episodes of the series Commander Keen: Invasion of the Vorticons. The other two are "Marooned on Mars" and "Keen Must Die!".