Talk:Waterfall/Puzzles/@comment-26308450-20160314075341/@comment-4360159-20160314081937

I suppose you're stumbling on how to actually play the piano in the game?

A note may be changed by holding one of the arrow keys (or having all of the arrow keys depressed. The currently selected note may be played by pressing "z".

If not, the solution is actually present here too. If you want some more "spoiler free" hints, I can try thinking some up.

Hope this helps.