After entering the following command, after pressing TAB twice, 4 application packages that can be installed will appear.
sudo apt install 0 #输入后记得按两次TAB键，自动补全就发挥作用了 The execution result displays: 0ad 0ad-data 0ad-data-common 0install 0install-core 0xffff, and then enter the following command to query what applications are respectively.
sudo apt info 0xffff # 0xffff为应用包名，其他包为0ad和0install According to the query results, 0xffff application is flashing Nokia mobile phone firmware, 0install application is to provide a package distribution management method, and 0ad turned out to be an RTS real-time strategy game similar to the Age of Empires, searched for the official website of this game, https://play0ad.com/ is a cross-platform game.
As a fan of Age of Empires and real-time strategy games, hunch that this is a good game, execute the following command to install:
sudo apt install 0ad #其他相关包不用输入，会自动推荐安装 
After installation, the game screen is as follows.
The background music and graphics, as well as the controls are very good!
Like all classic games in the past, it supports LAN battles, especially it is a cross-platform game, you can use Linux or Windows system to build a game console, another Linux or Windows system LAN network battle, recommended!