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.
Martin Smith (63241)