A couples of days ago I discovered an old game called Hnefatafl. It is a variant of the “Tafl” board games bellowing to the ancient Germanic and Celtic tradition. It similar in some aspects to chess, but with different elements.
Basically, one player plays with the king and defenders in the middle and the other player plays with the attackers on the sides. Pieces move in any direction, and if you put 2 pieces on both sides of another piece, you kill it. The game ends if you kill the king or if the king reaches one of the corners and there is a free path to one of the adjacent corners.
It is more difficult than it seems.
Also in the same webpage is possible to find some classic games like…
And also some more clasic like checkers or tic tac toe, and other I never heard about.
(Click in the image to enlarge, otherwise, if it is not in its original size it will look weird).