The game is fairly easy... mostly common sense... but I did struggle with 
one section and I'm sure other users will too.  To avoid blowing up the 
Targana type this sequence on the keypad:

Green Blue Blue Blue Yellow

or (if you number the buttons 1 to 5 from left to right)

1 4 4 4 3

A little Klingon opera melody.

Have a blast!

The Spoiler Centre