Install freeciv-client-sdl by entering the following commands in the terminal:
sudo apt update sudo apt install freeciv-client-sdl
Description:
Civilization turn based strategy game (SDL client)
Freeciv is a free clone of the turn based strategy game Civilization. In this game, each player becomes leader of a civilisation, fighting to obtain the ultimate goal: the extinction of all other civilisations. . This version of Freeciv is based on SDL, the Simple DirectMedia Layer library. It is recommended to install the »freeciv-client-gtk« package and to use the GTK+ client unless you really want to try this one. The SDL client offers a different look&feel but lacks some functionality of the GTK+ client.
Homepage: http://www.freeciv.org/
Version: 2.5.10-1
Section: universe/games