Not U.S. English.

for sure

With all due respect to Shelley, I find nothing dated or out of the ordinary with the phrase "fun and games". I, too, am an Australian. Feel free to use it as you wish

'Fun and games' is an older phrase and isn't used much anymore. It was more my parents generation so those who are over 60 might still use it. It is meant to be a little sarcastic. The most common use isn't as sarcastic 'it's all fun and games until someone loses an eye'. Still mostly used by parents, especially when children are playing with pointy objects. I am from Australia so the use of it might vary compared to America or England.