Jun Senoue on Sonic Generations Original Soundtrack:

Water Palace

There are many cases that Sonic-related soundtracks are not released outside Japan and while adopting the version recorded only in that soundtrack and in which the original composer handled for Act1 (classic), Cash Cash tried to prepare the final form with more beat-effective impression. It is something that I saw the scenes in which the children are humming it the whole time after playing Sonic Rush, but for the recorded music, it is both compact and catchy, its edge is effective, and it is something simply impressive.