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@pampeans
@datguygamer additionally, Missions can be used to farm gems, but you must spend the time (not gems) to upgrade your Tfs so that you consistently receive 3 stars for each and therefore all of the gift boxes. The 8/12/24 hr missions (the ones with the most question marks) yield the most gems, though it’s sometimes hit or miss. But, at least you will be able to use the materials gained for the gem farming strategies that @avip2u mentioned. Also, waiting for all of the nodes to generate 600 coins (every 4 hours) will occasionally produce crates with gems.