Os and Xs
Noughts and Crosses
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Tic Tac Toe or Os and Xs.
The classic time old game but with a twist.
With a snap actually. Many snaps actually.
You use the large frame to mark the skin of a sub with the parallel lines that form the iconic board.
After that you use the O and X frames to mark each turn.
Take your time
Depending on the sub it can take many flicks of the bands to make the marks clear.
It can also take time for the marks to appear properly.
So, take your time and enjoy the game.