Bolls goes through object

I am making a kind of roll and ball game but with improvement that catching object are dynamic and they are instantiated one after one with in interval of 1 sec . The are born in one place and start running to opposite place of the plane. Player boll must catch them like in “Roll and Ball game” scoring points. Also there is kind of maze in plane. I am facing some challenges with this task. First, how to direct all the balls from instantiated point to let say (exit gate)? And second - instantiated balls go thorough everything( walls, obstacles in the maze)?

The walls and balls would need a Rigidbody and a type of Collider, I imagine BoxCollider for the walls and SphereCollider for the ball.

Let me know if it works.