This is another variation on the old sliding block game, but with a sting in the tail. You know the kind of thing, shove rocks around the screen trying to flatten beasties. Trouble is, if you miss the beasty the rock ounces off the first thing it comes across and gives you a nasty slap in the gob. Not a pretty sight. Course you can dodge out of the way.
Confused? Let uncle explain. The year is 2003, the setting the aftermath of a nuclear holocaust in a maze of rocks, where the sole survivors are Krackats (who dreams up these names?). These little nasties have developed a taste for human flesh (flesh 'n chips?), so the idea is to give them a good pounding with a rock. But I like I said, watch out for the rebound, it's a killer.
Then there's the other screens. The first is fairly straightforward, sort of what you see is what you get. But the second and third are something else. Number two is the 'Hayfield' where the whole screen is filled with rocks. You have to guess which ones are real. Then come the hidden rocks. Finding a way around a maze you can't find presents certain problems. Need I elaborate?
Rubble Trouble is good, probably the best I've seen for the BBC. Well worth an investment.