The playground is a virtual open world that you have to first of all explore to find resources - building blocks so that with their help already in the second stage fill the game world with your ideas - to build a house a fortress or even a city - for everyone that you can come up with in theory and put into practice.
The cubic world of block craft 200 is an aggressive world - it is inhabited by predators monsters and other not always friendly players.
Having built your own world you will need to defend it for which you will need weapons and friends so that together with the latter as allies protect your worlds from the invasion of other players' unions.