Just completed this - solution on CASA is for Acorn Electron Haven
The 9Dancers.Z5 I just solved follows it closely until it gets to the round barrow.
Solution says CLIMB the ROUND BARROW, but on .z5, just U works. getting down, just D works.
Only minor, but worth pointing out perhaps.
Nine Dancers
Moderator: Alastair
Re: Nine Dancers
Testing the BBC version that I have (version E5), it is necessary to type CLIMB ROUNDBARROW or CLIMB BARROW to go up, but you can type just D to go down.