My daughter invented a version of Tic Tac Toe using one of those magnetic travel sets.  Rather than place the X or O, they are already on the board at the start.  Each player takes a turn sliding one of their pieces in a cardinal direction (North, East, South, or West) until someone gets 3 in a row.

To play, click and hold to drag one of your pieces,  The available spots are highlighted in Green, the unavailable ones are highlighted in red.

You can play here: https://gapsoftware.net/games/nnn/

Note to any interested parties, the JavaScript is heavily commented for teaching purposes. 
Feel free to view it here: https://gapsoftware.net/games/nnn/nnn.js

Happy Gaming