How are Streetpass Puzzle Swap panels distributed in Europe / Australia?

Solution 1:

With Nintendo's revamp of the Streetpass Puzzle system this question is irrelevant as-written, and the new way they're distributed is more transparent.

Different countries, and different regions in larger countries, still get different puzzles. These regions are identified in Streetpass Mii Plaza's map feature. On top of that there are special pieces you can't buy in particular regions at all and must Streetpass someone from another region to get; these are indicated by purple squares.

With the new system, new puzzles can also be distributed by Spotpass.

Solution 2:

In canada ontario, i finished the kirby puzzle... Only way to get another panel in same area is to have another 3ds and re-format it to different countries/ states inorder to get a new piece for a new panel