Start the game with the -tedlevel [level number] command line
parameter. The level number is a two digit number with the tens
digit representing the episode minus one and the ones digit
representing the level number minus one.
Start the game with the -baby, -easy, -normal, or -hard
command line parameters.
Start the game with level select and difficulty select command
Full health, ammunition, keys and chain gun:
Press L + I + M during game play. Note: Your score will reset
to zero after this cheat is enabled.
Unlimited ammunition, invincibility, all keys:
Press M + L + S during game play.
Commander Keen cheat message:
Press A + B + T during game play.
Hold M at the memory screen that appears while the game loads. Three
music menu options will appear after the game finishes loading.
Start the game with the -goobers command line parameter. Press [Left
Shift] + [Alt] + [Backspace] to enable debug mode. Enter one of the
following codes to enable the corresponding cheat function.
Change border color [Tab] + B
Display number of items, doors, and actors [Tab] + C
Skip two levels [Tab] + E
Displays coordinates [Tab] + F
Toggle God mode [Tab] + G
Lose health [Tab] + H
Free items [Tab] + I
Display memory usage [Tab] + M
Pause without message [Tab] + P
Exit game [Tab] + Q
Toggle slow motion [Tab] + S
View graphics and play sounds [Tab] + T
Add extra VBLs [Tab] + V
Level select [Tab] + W
Extra stuff [Tab] + X