kostermw The Last Tile Finder can be activated for free in any Mine once every 24 hours. You can use it in a Mine to find up to 10 Tiles. If you want to use it in another Mine before those 24 hours are up, then it will cost Gems to activate it. You can activate it in a Mine and go out of that Mine, then come back to that Mine later (it can even be after 24 hours), and as long as you haven't activated it in any other Mine it will still be active in that Mine. For example, you activate the LTF in Mine A, then leave Mine A with Tiles in it you haven't looked for yet. You then go to your Camp or another Mine, maybe even start another Event. As long as you don't activate the LTF anywhere else, then when you come back to Mine A it will still be active there.