Space Station: Silicon Valley 

Asteroid level 
At the saved game or level selection screen, press Down, Up, Z, L, Down, Left, 
Z, Down. If you entered the code correctly, you will hear a ping sound. Then, 
select a saved game or level and press Left.

Europe level 
At the saved game or level selection screen, press Up, Down, L, Z, Down, Up, Z, 
Down at the game or level selection screen. If you entered the code correctly, 
you will hear a ping sound. Then, select a saved game or level and press Left.

Ice level 
At the saved game or level selection screen, press Up, Down, Z, L, Down, 
C-Right, Z, Down at the game or level selection screen. If you entered the code 
correctly, you will hear a ping sound. Then, select a saved game or level and press Left.

Jungle level 
At the saved game or level selection screen, press Up, Down, L, Z, Down, C-Left, 
Z, Down at the game or level selection screen. If you entered the code 
correctly, you will hear a ping sound. Then, select a saved game or level and press Left.

Desert level 
At the saved game or level selection screen, press Up, Down, L, Z, Down, Left, 
Z, Down at the game or level selection screen. If you entered the code 
correctly, you will hear a ping sound. Then, select a saved game or level and press Left.

Final level 
At the saved game or level selection screen, press Up, Down, L, Z, Down, Right, 
Z, Down at the game or level selection screen. If you entered the code 
correctly, you will hear a ping sound. Then, select a saved game or level and press Left.

Secret level 
At the saved game or level selection screen, press Down, Up, Z, L, Down, Left, 
Z, Down at the level selection screen. If you entered the code correctly, you 
will hear a ping sound. Then, select a saved game or level and press Left.

Extra energy 
At the saved game or level selection screen, press C-Left, L, Z, Down, L, Z, 
C-Left, C-Right. If you entered the code correctly, you will hear a ping sound. 
Then, select a saved game or level.

Funny effect 1 
At the saved game or level selection screen, press Up, L, Z, Down, Left, Z, 
Down, Up at the game or level selection screen. If you entered the code 
correctly, you will hear a ping sound. Then, select a saved game or level.

Funny effect 2 
At the saved game or level selection screen, press L, Down, Z, L, Down, Up, L, 
Left at the game or level selection screen. If you entered the code correctly, 
you will hear a ping sound. Then, select a saved game or level.

Funny effect 3 
At the saved game or level selection screen, press Z, Down, Up, L, Right, L, 
Left, Right at the game or level selection screen. If you entered the code 
correctly, you will hear a ping sound. Then, select a saved game or level.

Funny effect 4 
At the saved game or level selection screen, press Left, Right, Z, L, Left, Z, 
Right, Left at the game or level selection screen. If you entered the code 
correctly, you will hear a ping sound. Then, select a saved game or level.

Stop camera in wall race 
At the saved game or level selection screen, press Down, A, C-Up, L, C-Down, L, 
Left at the game or level selection screen. If you entered the code correctly, 
you will hear a ping sound. Then, select a saved game or level.