You can redefine force of gravity as you wish. The UI provides a drag drop code section where you can design your next law of physics.
Force of Gravity (the first episode of the Science Puzzle series I am planning) is actually a simulation in the form of a puzzle.
To solve the puzzle, your solution must match the observations on Earth and Mars.
Well, if you are free spirited, why care about reality? Just go to the arbitrary planet and blow it up with your physics understanding.
Good luck!