I am not from NGD,
What I can tell you is that game shouldn't be able to freez your OS.
This is definitively bug in driver. Anything allowing any application to freez your OS is a bug in OS itself.
You should seek help from driver maintainer or vendor first.
What you can do to help them is after crash, check syslog, because you're problem is driver related.
Options
- Check system logs.
Basically from root- # less /var/log/syslog
- # less /var/log/messages
- Access system logs when system is frozen
If you cannot find anything relevant, you can always install sshd, connect with ssh client from your mobile phone (Android) or laptop. And display content of syslog in real-time
# tail -f /var/log/syslog
Then lunch game to reproduce freez and see what happens, what is reported.
I hope this helps you to find a problem.
But first try updating your drivers !!