Helichopper

Your people’s clones are trapped behind an electric fence on each of the 23
levels of this action game. To rescue them you must pull up next to the fence
and wait for them to cross, before placing them into one of the gaps on the
left of the screen. The correct one to place the clone into cycles through in
sequence. On each level a set number of these must be rescued.

The difficulty is that a swamp lies between the fence and the safety zone, and
it is constantly spawning creatures who kill you on contact. You are armed
with bombs with kill in a direct downward trajectory, so will be using the top
area of the screen a lot. Although you can slot into one of the home-cells and
wait for the sequence to cycle round, this runs the risk of becoming trapped
in the section as the swamp-creatures encroach. The colour of the swamp things
dictates the score but not the difficulty. On later levels there are static
hazards on screen, as well as enemies firing at you.

Helichopper