Tic Tac Toe Tum

It's like the classic Tic Tac Toe, but with a little extra complexity. Instead of a 3x3 grid, it's 4x4. Be the first to get four marks in a row, or in a box, or in the four corners of the grid. In the event of a stalemate, whoever gets the most threes in a row resolves it. Even then there can still be a stalemate.