Boy, everybody here talks about tuxracer, which I have never played. I like bzflag, though; and I've been working with CrystalSpace and planeshift up until I bought my new mobo/videocard. Now I just wait for AGP support on nForce2.
ldd should try and read values from /etc/ld.so.cache. You may want to look at /etc/ld.so.conf, and make sure you have all appropiate directories in there. Mine looks like this:
root@douglass:/home/douglassc# cat /etc/ld.so.conf
I have deleted /etc/ld.so.cache and re-ran ldconfig in the past to make sure everything looks right.
Are you using framebuffer support or kernel AGP ?