Defend the Yellow River is the 152nd stage of Piano Tiles 2. The stage can be purchased at a cost of 16 Diamonds. You have to be careful when you get 1 star. The currently world record is by Glory YT.
with 4669. It's one of the songs that slows down when you get the 1st or 2nd star.
Notably, this is the only stage so far that decelerates within the stage, from Section 1 to Section 2. This is likely done to reduce the difficulty of single tiles.