In the original Commander Keen series, there were keyboard-entered cheat codes that granted, among other things, immortality, noclip, and flight. I think those were the three major ones, and I would like to activate them in my Steam version of Commander Keen for…research purposes.
Do these cheat codes work the same as in the original? Do they work at all?
Best Answer
The two linked articles in the comments combined show how to enable cheats in Commander Keen - The Steam Tutorial shows how to enable those cheats in 4 - 6, and the question linked "How do I turn on GOD mode in the first Commander Keen" explains how to turn on cheats for games 1 - 3.
However, the definitive answer can be found here, for all versions and all methods necessary for turning cheats on in all the classic Commander Keen games.
Note that on Steam specifically, for the later episodes, you must first input A+2+Enter, holding down all at once, or the cheats won't work.
Direct from that article, here's how to activate cheats.
Cheats for Episodes 1-3
The key combinations need to be pressed at the same time.
Cheats for Episodes 4-6
The key combinations need to be pressed at the same time. Some versions might require pressing A+2+Enter before using cheats.