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 the "Level select" and "Difficulty select"
command line parameters.
Infinite ammunition, invincibility, all keys
While playing a game, press M + L + S.
Full health, ammunition, keys, and chain gun
While playing a game, press L + I + M.
Note: Your score will reset to zero after this cheat is enabled.
Commander Keen cheat message
While playing a game, press A + B + T.
At the memory screen that appears while the game loads, hold M.
Then three music menu options will appear after the game
Start the game with the "-goobers" command line parameter.
Then while playing a game,
press [Left Shift] + [Alt] + [Backspace] to enable debug
mode. Then, enter one of the following codes to activate
the corresponding cheat function:
CHEAT CODE RESULT
[Tab] + B = Change border color
[Tab] + C = Display number of items, doors, and actors
[Tab] + E = Skip two levels
[Tab] + F = Displays coordinates
[Tab] + G = Toggle God mode
[Tab] + H = Lose health
[Tab] + I = Free items
[Tab] + M = Display memory usage
[Tab] + P = Pause without message
[Tab] + Q = Exit game
[Tab] + S = Toggle slow motion
[Tab] + T = View graphics and play sounds
[Tab] + V = Add extra VBLs
[Tab] + W = Level select
[Tab] + X = Extra stuff