can use Gems
http://prnt.sc/a54lpn
http://prnt.sc/a54kne
http://prnt.sc/a54lpn
http://prnt.sc/a54kne
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the tutorial quests (up to lvl 17) merely show you how the game works and gives you any necessary gems needed for the quests. It is then up to you whether you want to spend gems on certain things or not. Most players don't.