There is 2 pc versions of this game. One is paid and the other one is free to play.

The free to play requires an internet connection to play, (you have to be online or you can't play it). It only gives 3 lava stones when you complete a puzzle. You have to spend real money to buy pets, lava stones, etc.

For those of you that want to play the free to play version, the steam link is;
https://store.steampowered.com/app/949050/Virtual_Villagers_Origins_2/