The sequel to Commander Keen in Invasion of the Vorticons, with a new engine and much improved graphics and sound. Once again, you must save the world armed with a gun and a pogo stick, against new aliens and through new worlds. This time you don't have to find the pogo stick, but you can find scuba gear to help you swim. Episode numbers in Commander Keen in Goodbye, Galaxy! continue from the original trilogy, making the two games a series. A CGA version was also released, and FormGen distributed a five level demo of the EGA version. There are 2 episodes in this game, with only the first episode playable in the shareware version.
Episode 4: Secret of the Oracle
Episode 5: The Armageddon Machine
Added by DOSGuy
Complete version history:
|Commander Keen in Goodbye, Galaxy! v1.4 Shareware Episode (729,683 bytes)||xxxx||DOS||Play online|
|Commander Keen in Goodbye, Galaxy! Special Demo Version v1.0 (538,631 bytes)||xxxx||DOS|
|Commander Keen in Goodbye, Galaxy! CGA v1.4 Shareware Episode (505,247 bytes)||xxxx||DOS|
|Commander Keen in Goodbye, Galaxy! v1.0 Shareware Episode (629,230 bytes)||xxxx||DOS|
|Commander Keen in Goodbye, Galaxy! CGA v1.0 Shareware Episode (485,385 bytes)||xxxx||DOS|
|Commander Keen in Goodbye, Galaxy! v1.1 Shareware Episode (595,751 bytes)||xxxx||DOS|
|Commander Keen in Goodbye, Galaxy! v1.2 Shareware Episode (580,039 bytes)||xxxx||DOS|
|Commander Keen in Goodbye, Galaxy! CGA v1.1 Shareware Episode (503,144 bytes)||xxxx||DOS|
Help running DOS games
Apogee still sells the registered version of this game for $5.99 by download. id Software still sells the registered version of this game with Commander Keen in Invasion of the Vorticons for $10 by download.
Pressing the [B] [A] [T] keys all at once will give you 99 shots, an extra life, and all the gems. This does not work on early versions of Aliens Ate My Babysitter.
Pressing [A]  [enter] all at once will activate debug mode. (Early versions of the game do not require this step.) Once activated, these keys will perform the following functions:
[F10] [G] God mode
[F10] [I] Free items
[F10] [J] Jump cheat (Note that you will not be able to jump down while the jump cheat is activated)
[F10] [N] No clipping (Be careful. If you fall off the bottom of the level, you'll die, even if you are in God Mode.)
[F10] [Y] View hidden areas in the level.
[F10] [B] Set border color (1-15)
[F10] [C] Show number of active/inactive objects in the level
[F10] [D] Record a demo
[F10] [E] End the current level
[F10] [M] Display memory usage
[F10] [S] Slow motion
[F10] [T] Sprite test
[F10] [V] Add 0-8 VBLs (Vertical Blanking Signal -- this will do nothing for most users)
[F10] [W] Warp to any level
[F10] [Y] Reveal hidden areas