Tested on Poudriere with 10.4-RELEASE and on CURRENT (also played some time on CURRENT).
To run it, you need to rename all the game files to lower-case. You also need to run avp from the game directory (the directory from which you can see avp_huds and avp_rifs subdirs).
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228246