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Needs rewording and less "requires a great understanding of the game" with more actual information.
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Tic-tac-toe is an extremely complex type of upload and technology on Powder Game and Powder Game 2. It consists of an upload where the user can play a game of tic-tac-toe against the machine designed by an uploader, this machine having been designed with sort of artificial intelligence, so that it is "invincible" or extremely hard to win against, depending on the complexity of the AI.
To do this, a user must not only understand the rules of "invincible tic-tac-toe", but also how to apply the rules to powder game. Some known uploaders who have achieved this include maybe tomorrow, Codnchips 67, and Hachi1.
Relation to programming
Designing a tic-tac-toe AI requires an uploader to apply the rules behind the successful AI to Powder Game. This is similar to real life programming, as it achieved in this way:
Imagine a 3x3 grid with the top left square labelled 1, the next square 2 and so on. This means that if the computer has placed circles on square 1 and 2, but 3 is open, it must play 3 next.
IF(1 == "O" && 2 == "O" && 3 == " ")
3 = "O";
In a similar way, the uploader must program each of these rules into powder game mainly with the use of IF logic, and also looping.
One of the biggest difficulties in designing a tic-tac-toe AI is efficiency. There are only 40,000 dots that can be used at any time with many rules to program, so a great understanding of the game is required in order to design an AI.