Game of Life is a "zero player game" where you set an initial state by activating or deactivating "cells" and then it progresses without influence. It was originally created by the mathematician John Horton Conway. I recreated it here based on its simple rules:

• Cells with two adjacent active cells retain their state.
• Cells with three adjacent active cells are set to active.
• All other cells are set to inactive.

Gravity is a simulation of a gravitational system.

You create bodies of certain sizes, masses, and starting velocities and allow them to move only dictated on the principles of gravity.