I don't know if this has made it's way to Oz yet, but it's gone huge in the UK and I have to say that it is thoroughly addictive.
It's Sudoku, a numbers game involving logic, reasoning and absolutely no mathematics. It is the perfect solitaire game/puzzle, if you ask me. If you're doing a crossword, your success is dependent upon whether or not you know the vocabulary, with this you just have to be aware of the numbers 1-9.
Find it, do it, spread the word. Play online here.

It certainly has. There's a sudoku puzzle in the Sydney Morning Herald every day for those who feel so inclined.
Hi,
Thanks for mentioning my site. I have just added easy, medium and hard puzzles for each day. I hope you continue to enjoy them. Any suggestions, just send a note via the site.
Cheers,
Gath Adams
sudoku.com.au