Download
UnReal World is playable on Windows, Mac, and Linux systems and requires a number pad to play properly.
You can download it for free here
If you’re willing to support Enormous Elk Games they have the game on Steam for $10.99.
to play simply extract the files and run urw.exe
Also once you get aclimated with the game and want to modify you can find a list of popular mods for the game here.