Install xsystem35 by entering the following commands in the terminal:
sudo apt update sudo apt install xsystem35
Description:
System 3.5 games engine for X Window System
xsystem35 is a free implementation of System 3.5, a games engine created by Alice Soft. It is able to run many existing System 3.5 games.
Homepage: http://8ne.sakura.ne.jp:20008/chika/unitbase/xsys35/
Version: 1.7.3-pre5-6
Section: universe/games