What is Pandora's Box?

Pandora's Box is a lottery. After restoring Pandora's Box, you can choose one of the nine boxes once a day absolutely free of charge - and there will be a random reward inside. There are rewards in each of the boxes, but they are all different and range from basic resources and energy to gold tools and crystals. In addition to one free gift, each player can choose another one, but they will have to pay with crystals or watch an ad to get it.