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 Can I disable video ads? I have another question or comment. I no longer get offered free hints. I bought a puzzle pack but it didn't appear. The game drains my battery/heats up my device Comments 0 comments Article is closed for comments.