Death Blow Level:
To activate the Death Blow level, go to the level selection screen and click on the spiral
after you've completed Level 12. 

Select any mission:
This cheat requires editing a text file. If you don't know what you're doing, we
advise not messing around with this cheat. 
Find the file 'shellcfg.h' in the 'dark\shell\' directory and change the line:

#define BTN_MISSION_COEFFICIENT 150
to 
#define BTN_MISSION_COEFFICIENT 157 


You can now select any mission from the dial by pressing the new CHEAT button in the
bottom left corner.