How about the traditional speed dance four keys? What did they say, even P, to solve? ? ? Seek a detailed explanation

Isn't there a luminous point that will move from left to right? After that, there is a shiny little piece on the right, flashing there. The so-called p is to wait for the luminous point to move to the center of the small block, and then press the space. So even if P arrives, the center of that small piece is also point P. Of course, in this abnormal game, the point P of every song is not necessarily in the center, sometimes it will be earlier and sometimes it will be later.