Use the following keys to move: 7 to move left, to move right, and the space bar to either deposit a bomb or patch up a section of road.
The enemy's trucks are black and yours are red. You are a saboteur and your mission is to stop a convoy of enemy trucks from passing you. The idea is to set the time bombs underneath the road by positioning your boat on the underground river.
The problem: Your own truck must be allowed to pass and you have no control over the fuses on your bombs!
The falling trucks would look great if there was a big splash and noise when they hit the water. The code to achieve this would go in the drop truck routine, lines 2500 — 2550, or a branch to an additional routine.
Amstrad Games Book