How can I use keys to open a suitcase?

You have to first reach a total amount of 100 keys in order to unlock a suitcase from the shop section.

Do I need an internet connection to play?

Yes, you will need an internet connection to play. If possible, try using a strong and stable Wi-Fi network instead of mobile data.

Everything you need to know about materials

What are matierals?  How can I get materials?In order to get materials, you have to assign cargo plane to a destination, then wait...