These come out every week, of course, but people I talk to always seem surprised to find that what's selling in Australia isn't matching up with what they expect to be selling.
So for the week ending April 6, as reported by Gamespot:
Top 10 Full-Priced Games (Australia)
1. Gran Turismo 5 Prologue, PlayStation 3
2. Brain Training from Dr Kawashima: How Old Is Your Brain?, Nintendo DS
3. More Brain Training from Dr Kawashima: How Old Is Your Brain?, Nintendo DS
4. Guitar Hero III: Legends of Rock double pack, Wii
5. Transformers: Decepticons, Nintendo DS
6. Mario & Sonic at the Olympic Games, Wii
7. Mario & Sonic at the Olympic Games, Nintendo DS
8. The Sims 2: Castaway, Nintendo DS
9. Call of Duty 4: Modern Warfare, PlayStation 3
10. Sight Training: Enjoy Exercising and Relaxing Your Eyes, Nintendo DS
So - what's selling? Mainstream. What's selling? Casual. What's selling? Licensed. And, speaking broadly, for Nintendo systems. To the best of my knowledge, the only reason GT5 is at the top is it just came out late last week - the rest of those games you'll note have been on shelves for a while now. In the case of Brain Training, for more than a year.
If you look back over Aussie game charts for the last - oh, three years - it's pretty much the same story. What Australia wants to buy is Guitar Hero, World of Warcraft, The Sims, and anything reasonably casual-friendly released for the Nintendo DS. Driving games typically do well, and Aussie sport games make a showing, as do the WWE franchise wrestling games.
Just a little reminder that almost the entirety of what we think of as gaming is better characterised as "niche or fringe gaming".