How would it work. Just the "outside" wall would disapear and everything else "shifts" that way, or would any line disapear and have everything else shift right or left to fill in the line.

(not to copy off too much from other sites), but I like how GT have a random piece placed on the board which both colors can use, and how they have a "black hole" space random on the board which NO player can place a piece - OF course they don't have those of the "spider" line games, just the normal line games, so i guess it would not be a copy there.

Also something that would be cool to try is some "special" shape boards. For example:

Square Wheel: 12x12 board with middle 4 spaces "blocked" out - BUT can build from the middle spaces also!