This is a new twist on an old game. Short term memory is challenged by this quick game. So is mental visualization and strategy. Once players get good at it, you can play anywhere; like in the car while traveling, on a school bus or while waiting anywhere. This cognitive challenge may also be helpful as a distraction to reduce anxiety.
This is Memory Tic-Tac-Toe: Draw a traditional playing board, then number 1-9 as demonstrated. Players take turn claiming places by number, mentally keeping track of all spaces played by both players. After someone states they have Tic-tac-toe, ask them to prove it by placing markers on the board. All must agree to the places marked to win the game.