About: http://webisa.webdatacommons.org/411793116

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	There are eight different types of enemy ships that will appear, plus on many of the screens there is a shield which you will need to shoot through before you can hit the various ships.
http://www.w3.org/ns/prov#wasQuotedFrom	mobygames.com