cube2 binary package in Ubuntu Focal amd64

 Cube2 is a networked 3D first-person shooter game engine. It supports modern
 graphic effects and conveys a sense of fast-paced oldschool gameplay.
 .
 The game client also works as the map editor. It is even possible to create
 and edit a map together with other people over a network connection.
 .
 The effects of Cube2 might be considered unsuitable for children.
 .
 This package installs the game client and map editor of the Cube2 engine.
 You need to install a content package like cube2-data if you want to play a
 game.

Source package