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When people are quarantined and can’t meet their friends, it can be difficult to have fun. That is the reason why virtual tic-tac-toe is useful. 

Virtual tic-tac-toe is a way of playing tic-tac-toe with your friends without having to touch a piece of paper with them. All you need to play virtual it is a way of communication with (e.g. iMessage, Skype) and a friend. In virtual tic-tac-toe, you need to memorize your and your opponent's moves. This leads to having better memory and strategic thinking. To make a move, the player has to say the coordinate of the square they want to put their mark. Meanwhile, the other player has to memorize the move to avoid trying to go to the square that has already been taken.

This is a fun way to play with your friends and thinking harder without risking to catch the virus from them.