I always liked these kinds of games, easily self constructible, easy to carry and fun to play.

https://en.wikipedia.org/wiki/A_Gamut_of_Games

And I always bewildered when I see some of these games built in plastic instead, like e.g.

https://en.wikipedia.org/wiki/Battleship_%28game%29 https://en.wikipedia.org/wiki/Dots_and_boxes

https://www.iggamecenter.com/en/rules/foxh