Current games in top 100 all-time best-sellers list.

[fkusumot]

Erik Aston said:

#36 Animal Crossing: Wild World 8.69M
There's no good game to compare this to; it has been a massive breakthrough for this type of game on a handheld.
Upcoming landmark: 10M in sales.

 You can compare this to a lesser selling game like Monster Hunter Portable (and 2). Although MHP isn't going to pass AC:WW they have very similar aspects of gameplay. Also similar to Harvest Moon and The Sims. Nice list and commentary.