Stack 4X4 is like Stack4 (which in turn is identical to the game of Connect Four), but you can place a piece along any of the four edges of the board (not just the bottom edge); or you can put it wherever it becomes part of a solid line of pieces extending all the way to any of the four edges. The object is to put 4 or more of your pieces in a row.  Another way of thinking about it would be to say that gravity worked in all four directions, not just down.

This changes the game a LOT.  What good players will often try to do is build strong areas on two connecting edges of the board, and try to get a winning combination of moves when the two areas meet.
 

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