There are many Linux free game applications.
However, there are a few free Linux games that are outstanding compared to the others. In this post, I would like to introduce them.
This game with its unique name is a Real-Time Strategy (RTS) game referring to the era of 500BC to 1BC.
This game is free and open source. You can install this game on Ubuntu through the following command:
sudo apt install 0ad
The Battle for Wesnoth is a turn-based strategy game. Each player moves their owned warriors and characters and when they are done, they end their turn to hand the turn to the opponents.
This game is free and open source. You can install it on Ubuntu via
sudo apt install wesnoth
7Kingdom (7Kfans) is another real-time strategic game referring to the ancient time. This nostalgic game with its basic graphics looks simple at first but includes skillful challenges of ethnic complications, mercenaries, espionage and diplomacy.
You can download this game from here: https://www.7kfans.com/
Steam is a gaming platform that can be installed on many operating systems including Ubuntu Linux.
Not all games withing this platform can be installed on Linux but some of them do. This list include some popular games such as CS2.
Please note that installing steam and using it will require you to have an email from a domain with good enough reputation.
Here, I have listed popular Ubuntu Linux games. If any other popular game is missing from the list, please let us know in the comments.