Nearly everything costs gems
So most mobile games, including this one, has two man currencies, being coins and gems. In most of said games, coins, the easier to get currency is used for most things such as buying creatures, habitats, etc. while gems are used for special items and speeding things up, and are usually a pain to get, but not this game. You basically make everything cost gems, to the point where playing for any amount of time costs real money, which is nowhere near worth it when the game has bad graphics and you can get something way better like Fantasy Forest Story, which has the same mechanics but everything is higher quality. You could even use the money on something actually decent like buying overpriced playing cards on the internet, because those are actually worth something unlike this game. If you aren’t willing to spend who knows how much money on a mobile game, don’t waste your time here.