If you missed the the FLOOR INFECTION event unlocks last time, you have another chance at getting the songs for DDR A20 PLUS. This time, the dates will be from 8/6/2020 to 9/7/2020. You may refer to this guide on how to unlock the FLOOR INFECTION songs for this event.
After you go through the first page of stamps, it turns out that there’s a secret second page of stamps that unlocks more CHALLENGE charts! The following songs gained a new CHALLENGE chart: 「ΩVERSOUL / BlackY」 「Firestorm / ETIA.」 「び / 立秋 feat.ちょこ」 「Lachryma《Re:Queen’M》 / かねこちはる」 Click the song names