Debug menu code: 

From a previously saved game, boot any one of the four discs. Hold LS 
+ P at the New game/Load game/Continue screen. Press A when the 
Continue option is highlighted. Alternatively, start a new game and 
enter a call sign of Origin systems, Bean, Prowler, Skywise, Nice 
Guy, Batfink, or Trip hawkins. The sound of a door opening will 
confirm correct code entry. Then, press LS + P. 

Pick Mission
Choose from any of the 53 missions in the game. You can play and 
continue from the selected mission. 

Play Movie
Choose and play any movie scene from the game. Most consist of three 
letters, one for the set-up, and the other two for the results of 
each of the possible choices. The landing and launching sequences 
have a different letter for every vehicle. 

Show Sprites
View any of the 283 sprites used in the game, with size and frame 
number information. 

Play In-flight Movie
Plays any of the 438 communication videos. 

System Flags
When changed from space, this may be used to set four different flags 
to true or false. Access the debug menu by pressing LS + P (after the 
menu has been accessed at least one time previously from booting the 
disk). 
- Killable: set to FALSE to to gain invinicibility through any 
  mission. 
- Bangable: set to FALSE to turn off collision detection.
- Finger Of Death: set to TRUE. While in flight, press X + A to 
  destroy any highlighted target (enemy or friendly) 
- System access menu: if set to FALSE, will prevent further access to 
  the debug menu. 
  
View Objects
View any of the 35 objects in the game with display of RAM usage, 
number of textures, and size of each texture. 

Benchmark CD
Displays the speed of the CD drive with checks in 100kb, 1 Mb, 10 Mb, 
100 Mb, and 500 Mb seek times. It will also check the throughput of a 
393kb blockfile and diskstream. 

Gameflow flag, Test Stream, Test SFX
These options are inoperable in the consumer version of the game. 

Hint: Keep Flint as a wingman:
Flint may still be used as a wingman even Rachel was selected over 
her as a love interest. Just do not talk to her on the lift. 

Hint: Enter Kilrah without firing a shot: 

After getting the Temblor Bomb and the cloaking device, fly to the 
point where you can make a jump. Jump to emerge at a point defended 
by gun platforms and ships. Activate the cloaking device and jump 
to emerge at a point defended by Thrakhash and other Kilrathi. Jump 
once more, then sit back and enjoy the ending.