Many variants on the concept of noughts and crosses (or tic-tac-toe as it is known across the pond!).
This version was created by Alan Parr. It is played on a 3x3 board with a supply of red, yellow, and green markers. Nine of each is max.
Object is to get Line of three of the same color.
You may:
(1) Put a red counter in an empty square.
(2) Replace a red counter with a yellow one.
(3) Replace a yellow counter with a green one.
So ultimately the board will fill with green counters.
According to the book "What's your Game" by Michael Cornelius & Alan Parr the game is a first player win.
Online Play