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The 2nd arcade release in Konami's beatmaniaIIDX franchise. Wasn't much of an upgrade but it added some popular tracks from the 5-key franchise as well as some new songs that still remain amongst the most notable in the series.
Japan
Beatmania IIDX Substream was released on July 27, 1999.
Beatmania IIDX Substream is available on Arcade.
Beatmania IIDX Substream was developed by Konami.