Tic-Tac-Tow

Tic-Tac-Tow
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In a short video, I saw a variant of the classic tic-tac-toe in which a playing field with 5x5 squares is used. A 3x3 grid can be moved, giving this variant a whole new twist. Unfortunately, I couldn't find the rules anywhere. However, with a little trial and error, they are obvious:
* the players take turns placing the pieces
* (own) pieces may be moved, even if not all 4 pieces have been placed yet
* pieces may only be placed within the grid
* as an alternative to placing the pieces, you can move the grid
* you may not move the grid in such a way that the opponent's previous move is cancelled
* the winner is the first player to have 3 stones in a row within the grid