Here is a VERY BASIC version of the old paper game dots that I used to enjoy when I was young. There is practically no error checking, so there is an opportunity to improve it.
You must start the game by clicking "New Game" and entering the names of the two players. One player then double-clicks between two dots to make their line. If the line completes a box, the players initial is automatically entered in that box and the player takes another turn. If a box isn't completed on a turn, the user must click "End Turn" (room for improvement there) and the other player takes their turn. When all the boxes are completed, the winner is displayed. This is the second game I wrote to learn VBA, after Tri-Peaks so please forgive any, less-than-perfect code.