Hi,
Mystery Isles can also be played on 128k and +2 Spectrums if you have a divMMC interface. I ported John Elliott's +3 version of zxzvm to esxDOS. You can download my port from: http://www.thefossilrecord.co.uk/wp-content/uploads/zx/zxzvm_latest.zip
Cheers,
bob_fossil