What do I use coins for? MiniMega Nerida May 13, 2016 04:08 Updated There are a number of puzzle packs that can be purchased using coins.Coins can also be used to buy hints. Related articles I no longer get offered free hints. How do "Puzzle Packs" work? I bought a coin stack but it didn't appear. I can't make purchases. My progress was lost. Comments 0 comments Article is closed for comments.