Description from http://shawweb.myzen.co.uk/

THE WALL STAINLESS SOFTWARE GBP 6.00 FIVE STARS

A wicked wizard has set you the task of climbing castle walls. For every wall successfully scaled points are awarded, but on each there are forces of spritely adversaries poised to attack, archers, dragons, withces on broomsticks and multi coloured cannonballs, just to mention a few.
Before attempting to bid for freedom you need to study their moves carefully.
On each screen the attackers and the way in which they travel are different.
A collision loses a life, but for every 500 points there's a bonus life. The game ends when all lives are lost and the score displayed.
If you're lucky this may be high enough to qualify your name to be entered in the Hall of Fame.
Control is from keyboard or joystick. You are unable to start until the alpha lock is up, a useful feature if you intend using the joystick option.
I can't say exactly how many different screens there are to survive. Ten was the most I could manage and there are more. There's certainly enough variety to keep you hooked on trying. Needs Extended Basic.