Physics Sandbox is an upcoming physics game in which the player is allowed to build and destroy whatever they would like. Visit the Home Page for more information, a free early-access download, and a donation link. Please post any feedback you have in a reply to this post.
-Home Page
Planned Features:
-Official Maps
-Singleplayer challenges
-Multiplayer battle mode
-Multiplayer sandbox mode
Development Updates
-Carlpilot 
Development Update 1: Main Menu and Official Terrains
Development Update 2: Join tool
How did you managed to join?
Parenting all of them to a empty gameobject, then changing materials?
To be honest, I don’t think that people will buy stuff like this.
Yeah I know, theres Garrys Mod which is such a simulator itself, but you will be unable to copy that success.
If you try to make money with it, better sell it as an asset (like an ingame map editor etc.)
When a block is joined, it becomes a child of an empty, and a rigidbody is added to that empty. The rigidbody is removed from the joined object, and its mass added to the mass of the empty.
-Carlpilot
yap 
thanks for the info:)
yaa
I feel it’s the right opinion 