Not much needs to be said. Player iamchris4life achieves the quad star 100% (All Fantastics) on VerTex² from In The Groove 2, as well as every other official Expert chart from In The Groove 1 and 2.
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.