Do you have TCP/IP installed as well on these systems? It sounds like you have IPX installed properly, and if you can file and print share using only IPX then name resolution and connectivity are working well too. I don't know if these games require IPX/SPX, or if they can use TCP/IP as well, but I would suggest installing TCP/IP as your primary protocol anyway.
Honestly, I am fairly limited in gaming with IPX, since I only used Kali to play online (it had some funky interpreter/translator to let IPX/SPX games work over TCP/IP) in the few games that did need it.