Nice, Graal Online (classic) is something I played a lot back in the days, when it still was free. Gotta look into it myself!
About what oldrocker99 said, you can check your arch. with:
If it says x86_64, you got 64-bits.
Don't think of the terminal as somethinga annoying, you'r the one in control. Looking things up is perfectly normal, I do it almost all the time doing when using terminal. Imo the important part is not that you'r able to do/run/solve something, but that you can find out how to do/run/solve something, by searching the web, man-pages, asking like now etc.
Tried it, downloaded it from here: Graal - x64 - Linux
Unpack the Graal -file, then started it through the terminal with
I lacked "SDL Mixer" to be able to play, so installed it:
Started it again and was able to play it.
sudo apt-get install libsdl-mixer1.2