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Everyone knows today's version of Tic Tac Toe (F.K.A. Noughts and Crosses). Everyone knows that after a short while it can get extremely boring.
Terni Lapilli (translates as Three Little Stones) is an ancient Roman version of Tic Tac Toe. A square is divided into eight triangles as shown below. Three white markers and three black markers are randomly placed on six different intersection points, e.g.

You then move your markers and try to create a line of three. (In the computer version you use drag and drop to move them.) You may ONLY move along lines, which restricts your diagonal movement options to corner-to-center or center-to-corner.
The computer version adds some more options. You can now save a board and load it later, or save an example board to use as a starter board.
If a piece ends up inside another piece, you can right-click the suspected piece(s) to move it/them to the side of the room, then manually put it back in the game. If you right-clicked one piece but two or more pieces are sent aside, your problem is solved.
To quickly reset the position of all pieces, click the Panic Button (button with three exclamation marks).
I made this game in ~3 hours.