Google Earth has a flight simulator but no "rocket mode". You can, however, change Earth to Mars, Moon, or a Sky mode to see other planets. The flight simulator still works on Mars and the Moon which is fun to try, but it is disabled in Sky mode.

Sandbox mode? You mean sanding? You can use the sanding button on most locomotives in this game.

You cannot. It will require 3rd party software

You can only do 2 player in the Sonic Simulator Mode.

You can toggle the Heads-Up Display (HUD) with numbers pressing 'H' key while in flight simulator mode.