Play the game here!
Ultimate Tic-Tac-Toe is fairly intuitive and the rules on Wikipedia are much more confusing than necessary. I recommend learning by playing. In a nutshell, there is 1 big grid that is controlled by 9 smaller grids. You win by winning on the big grid.
You can configure players via Config > Update Player X/O > New Game.
You can also have 2 AIs battle it out!
Play the game here!
This project is written in TypeScript with no external packages.
tscAlternatively, use the Makefile commands if you have the Make tool.