I built a castle, and I placed it into the game. the character walks through the walls and doesn't know that this object should be solid. How do i turn this building into an actual solid object.

Please somebody help me.

You have to create a physics mesh for your castle. You can model this in either your 3D modelling program (and export as a separate object) , or in Esenthel itself.

thank you. I know what to do now. sorry, i have to ask a million questions, but I'm new to making games.