query: SELECT DISTINCT ?item ?value
  WHERE
  {
  	{
  		SELECT ?item ?value {
  			?item wdt:P1712 ?value .
              FILTER NOT EXISTS {
                ?item p:P1712 ?pval.
                ?pval pq:P400 ?plat.
              }
              FILTER (STRSTARTS(?value,"game/"))
  		}
  	} .
  	SERVICE wikibase:label { bd:serviceParam wikibase:language "de,en" } .
  }
  ORDER BY DESC(?value)