Board Thread:General Discussion/@comment-100.1.71.7-20160415023228/@comment-1200981-20160417223745

100.1.71.7 wrote: the one were sao progressive takes place in.

SAO Progressive is not a different universe. It take place within the same continuity as the main series with some soft retcons, as TUSF pointed out. Reki himself states this at the end of the very first Volume of Progressive. Progressive is merely expanding the Aincrad arc by exploring Kirito and Asuna's previous adventures before they reached Floor 75.