These are videos of every CHALLENGE chart for the DDR 20th Anniversary song. Consider these study notes.
#OurMemories
https://www.youtube.com/watch?v=2vIjjtkZX6U
https://www.youtube.com/watch?v=2DHahH1W-VQ
Show Me Your Moves
https://www.youtube.com/watch?v=rLVaGkTNMlw
https://www.youtube.com/watch?v=mLFQPw1W008
CHAOS Terror-Tech Mix
https://www.youtube.com/watch?v=dsABvCE4vYU
https://www.youtube.com/watch?v=SxM4E2OuD3k
POSSESSION (20th Anniversary Mix)
https://www.youtube.com/watch?v=iW2qihs-Pvo
https://www.youtube.com/watch?v=jPy1fehV4U0
MAX 360
https://www.youtube.com/watch?v=s3-fp5Mnme4
https://www.youtube.com/watch?v=L4frSMQaLwc