LASER GATES
To destroy the detonators, convert the last number on the chip 650_ to binary (this is random with each game), then shoot the pins that would be 1s (shooting a wrong pin twice is fatal).
When you reach the end of the 4th tunnel, theres no chip to shoot; the game just ends (pictures #1 and #2).
BUG: Shooting walls at the height of the bottom hills removes the wall from that point down (picture #3).