TicTacLife

TicTacLife is a mix of the classic TicTacToe with Conway's Game Of Life.

The Game of Life is a cellular automaton, where a grid and a few simple rules can lead to some incredible patterns. You can learn about it and play around very easily right here: https://playgameoflife.com/

...Or witness impressive patterns in its official page: https://conwaylife.com/, like this one:

Now, what would happen if we took the Game of Life's ability to iterate over a board of cells and applied it in the middle of a simple, innocent TicTacToe match? The depth of such a simple prospect will surprise you!