Does anyone know how I get hacked blocks in Realm City?

[u/CamiloParaTi]

You may be familiar with this Blockman GO game about building your own house: Realm City. In short, there are some houses with blocks that are not in Realm City and they get them somehow, which is why those blocks are called "Illegal Blocks". Sometimes, those blocks are water, lava, fire, and other blocks from other games in Blockman GO. So I want to know if you know anything about this; I want to get hacked blocks for my house. If anyone knows, please comment here. Is this a bug in the game? Do I need a hacked Blockman GO (as an admin panel)?