I did my first attempt at PK Low%. It was terrible (2 Hours). But afterwards I got 2 achievements. Naked Plague and Penny Pincher. Penny Pincher is beat the game without spending any money including Cypher Coins. It seems to me that the game is considering green coins as currency as opposed to a collectable. With Music sheets, none of them are really in the way. You have to go out of your way, if even slightly to get them but the coins are are everywhere.

With the tonics, I skipped the chest in the plains that gives you five but I did use the ones scattered in the OoNQ levels. They felt more like health drops in a sense when I found them in the stages. What do you guys think?