The Keencyclopedia
Extra Life
Grab an icon of Commander Keen or other items to receive and extra life. In each different episode, a certain amount of points will also get you a new life. The amounts is usually 20,000 points.
Found in: Keen 1, Keen 2, Keen 3, Keen Dreams, Keen 4, Keen 5, Keen 6, Keen GBC

Keen Dreams

Keen 4

Keen 5

Keen 6

Keen GBC