Tic Tac Toe is a classic game that can be enjoyed by people of all ages, and the ability to play it both offline with a computer and online with other players adds even more options for entertainment.

The customization options you mentioned, such as board size and theme color, are a nice touch that can make the game more personalized and visually appealing. And the ability to adjust the computer (AI) difficulty is also important, as it can make the game more challenging for experienced players or easier for those who are just learning.

Overall, Tic Tac Toe is a great game to have on hand for quick and simple entertainment, whether you're playing solo or with others.