Hello, The A1200 is not fully backward compatable to run A500 software. Installing WHDLoad can be tricky as you need additional files. Please see the read me file with the game icon. The best degrader you can get is Relockick 1.4 available on ebay NOW. You just load the floppy then load your game.Then all should work! You could try Tude freely available on
www.aminet.netHope this helps.
Stephen