The sequel to Commander Keen: 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: 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

Downloads

Complete version history:

Commander Keen: Goodbye Galaxy v1.4 Shareware Episode (729,683 bytes)	xxxx	DOS	Play online
Commander Keen: Goodbye Galaxy v1.2 Shareware Episode (580,039 bytes)	xxxx	DOS
Commander Keen: Goodbye Galaxy v1.1 Shareware Episode (595,751 bytes)	xxxx	DOS
Commander Keen: Goodbye Galaxy v1.0 Shareware Episode (629,230 bytes)	xxxx	DOS
Commander Keen: Goodbye Galaxy Special Demo Version v1.0 (538,631 bytes)	xxxx	DOS
Commander Keen: Goodbye Galaxy CGA v1.4 Shareware Episode (505,247 bytes)	xxxx	DOS
Commander Keen: Goodbye Galaxy CGA v1.1 Shareware Episode (503,144 bytes)	xxxx	DOS
Commander Keen: Goodbye Galaxy CGA v1.0 Shareware Episode (485,385 bytes)	xxxx	DOS

Help running DOS games

Availability

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: Invasion of the Vorticons for $10 by download.

Cheat Codes

Customer Cheat

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.

Debug Mode

Pressing [A] [2] [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