Sandbox 3D by Catsbit Games is a free-to-play open-world physics sandbox game that allows you to manipulate various objects and experiment with physics with your friends. With Sandbox 3D, you can let your imagination run wild and build anything you want in a virtual world that offers endless possibilities.

The game has a multiplayer mode that allows you to play with your friends, and there are five different locations to explore, including Desert, Speedway, Military Base, Football Field, and Modern City. Sandbox 3D also has a variety of characters and vehicles to choose from, including land and air vehicles. In addition, the game has a building system that allows you to create anything you can imagine.

The game has recently been updated to include 150+ items in the inventory and 2 modes: public and private. In public mode, everyone can create and delete objects, while in private mode, only the owner can delete objects created by others. The game has a forum where you can leave suggestions for improving the game and report bugs.

Overall, Sandbox 3D is a fun and engaging game that offers endless possibilities for players who enjoy open-world physics sandbox games.