Talk:Shop/@comment-173.50.65.32-20150305061057/@comment-24668482-20150305121003

When you start the game they are mostly used to unlock new pictures, but once you have them all open there are definitely less uses for coins (though updates do bring new pictures, they are not exactly frequent). So yes, unfortunately, the best thing you can do with them now is buy a limited number of tools (Compasses; Time Machines; Lanterns) and talismans (Scrolls; Fortune Talismans). I suppose one good use of them would be to work on the Tooling Around desktop award - its top level requirement is to use 50,000 tools, which is quite an ask. But there is no limit to how many Time Machines you can use in any one play of a picture or puzzle (other than boredom I guess), so you could use your coins to buy Time Machines, and just use Time Machines even when you don't need them to move your progress in that award along.