Wikidata limit query to specific property constraints

I'm trying to list video games along with the data size (P3575). I want to limit the results to only show those in megabytes (Q79735) as a property constraint of data size.

Here is what I have now, which lists everything (mainly Megabytes, Gigabytes, block):

SELECT ?item ?itemLabel ?Size ?dataSizeLabel WHERE {
  ?item wdt:P31 wd:Q7889.
  ?item p:P3575 ?nodedataSize.
  ?nodedataSize psv:P3575 ?valuenodedataSize.
  ?valuenodedataSize wikibase:quantityAmount ?Size;
                   wikibase:quantityUnit ?dataSize.
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
}

If I add:

?item wdt:P2305 wd:Q79735

then I get no results.