Level Warps Press X+Z+A+W during game play.
Alternatively, press the keys A+R+M+I+N at once (for Armin Gessert). A+R+M+N or 
A+M+I+N will also work.
Press the keys M+A+N+R during gameplay (for Manfred Trenz).

 
Cheat mode (1) Load or reset the game, then execute the following BASIC commands 
before running or restarting the program.
POKE 2446,255
POKE 6697,255
SYS 2098
 
Cheat mode (2) POKE 8257,173 
Cheat mode (3) POKE 10749,173 
No Bridges POKE 6664,96 
