How To Make Holes In Terrain??

How can I make holes in terrains? I have a room with a tunnel out and I want to have the tunnel come out of a cliff face made of Unity Terrain.

EDIT: I have no money to invest into anything for this.

This is not possible with the standard Unity Terrain. You need a voxel-based system, or need to create the terrain as a mesh in a 3D package like Blender or Maya.

I’m a big fan of VoxelForm myself, but there is a free voxel add-in. Go to the Asset Store and search voxel. You’ll see Old Skool, and it’s free. Related link: Play OldSkool Designer, a free online game on Kongregate