Hello everyone, I have made a strategy game which is as challenging as Go. Rules of the game are as follows.
1. The game is played on a big 9 by 9 board like Sudoku.
2. This big board is divided into 9 smaller boards of 3 by 3 (local boards).
3. Aim of the game is to win any one of the 9 available smaller boards.
4. Your move determines in which local board AI will make a move. If you place x in the first position of small board number 5 then AI will have to make a move in board number 1 and vice versa.
5. Rules of normal Tic Tac Toe apply to local board.
6. First player to capture one of the local boards wins the game.

If you want to try it out here is the link: https://play.google.com/store/apps/deta ... yComp.sudo
There are 5 levels and 2 modes to this game. The rule above are for mode 1 of the game. Each mode requires a different strategy to win. Below is the image which will give you an idea what the game is about.
Thank You.

What does it mean to "capture one of the local boards"?

It's called "Ultimate Tic Tac Toe" or "Super Tic Tac Toe", and it's been around for quite a while (https://en.wikipedia.org/wiki/Ultimate_tic-tac-toe). From the screenshot it looks like it's a normal implementation (getting 3 in a row on a local board wins that space on the larger board, aiming for 3 local boards in a row), the rules as described in the post would be a good bit simpler (just having to win one local board)

Definitely a lot more interesting than regular tic tac toe! Back of the envelope calculation puts it between 6x6 and 7x7 Go for tree complexity. Challenging is always tricky to compare: 7 feet and 7,000 feet are both deep enough to drown in.