Apt-get :: apt-get question?

OK. I made a hd installation, and enabled apt-get, and used it to install "freecraft".

apt-get worked fine EXEPT that the freecraft I got was an old version of the game! (from 2002 or -3) Still under development.

Before, when I used SDL from liveCD, I used mySDL to download freecraft.dsl and it was newer (better) version! (good for mySDL)

How can this be? How can I get the new version with apt-get? And how can I browse what is available for downloading with apt-get?
Where does apt-get download programs from?
__
anaconda

OK!
Now I get it

Used some googe, and found:
http://www.debian.org/doc/manuals/apt-howto/

original here.