I recently bumped into a cool RTS (real time strategy) game for Linux called Hive Rise. Although the game is not open-source, it offers a free Linux download as a RUN file which can easily be installed on your Ubuntu box.
To install it in Ubuntu, you only need to follow these steps:
First, download the .run file from the official website (direct link here). After the download is finished, open the terminal, make sure the current working directory is the one where you saved the installhiverise.run file and make it executable:
chmod 755 installhiverise.run # or chmod +x installhiverise.run
Alternately, in Nautilus you can right-click on it, go to Properties, then the Permissions tab and tick the Allow executing file as program checkbox. Now, install it (either double-click the installhiverise.run file or from terminal issue):
Accept the license agreement:
Select a destination for the installation. I used here /home/embryo/apps/hiverise, but you can choose any other directory you have access to (the default /home/USER/hiverise should be fine too).
After the installation is over, go to the directory where you installed Hive Rise and run the hiverise script:
This should be all.