To get into the underground complex, first find a small, upright, rectangular box with two flashing squares on it; thats the computer terminal. Face the flashing squares, hit ‘F2’ to bring up the computer, and enter the words “KAL SOLAR” to activate it. hit ‘F2’ again to exit. On your way to the computer, you should have passed a shower like structure. That’s the transporter.
Press '1' on the main menu to start the game and press '5' on the keypad to bring up the scratchpad. Enter "I AM NOT A CHEAT" and press '5' on the keypad to close the scratchpad, then press the 'DEL' key. Now press 'Help' and then 'ESC' to exit the game. Now press the fire button or any key to bring the main menu and press '1' to start a new game. Now when the game starts you will have a full inventory, press '3' on the keypad to verify.
After following the instruction above to activate the cheat (once you press the 'Del' key) the following keys are available.
Press ESC (without first pausing) to view ending (only works on the surface)
Press 9 on the keypad to render only vector graphics
Press 8 on the keypad to stop the ants
Press - on the keypad to display coordinate info at the bottom of the screen
Use the Left & Right cursor keys to switch between the supported languages