This is an implementation of "Conway's Game of Life" using geometry nodes in blender. It makes use of the new simulation zone to hold state between frames.
This came about as a proof-of-concept when I was working on a much more complex simulation using geometry nodes: https://sirrandalot.gumroad.com/l/GeometryNodeLifeSim
Check out the whole development process:
Don't hesitate to contact me if you have any questions or find any issues!