in many cases you could simply move the directory that is taking too much space to different directory then either make softlink or if that didnt work you can use mount --bind
for example if directory /var/cach/mygame is too big, move my game to /mnt/part2/mygames
then either do ln -s /mnt/part2/mygames /var/cach/ or mount --bind /mnt/part2/mygames /var/cach/mygames
the miunt option is not permanent so if it works, u will need to add it to /etc/fstab to make it permenent