Why does Level-5 continue making Professor Layton games? It's a mystery unworthy of even the apprentice puzzle-detective Luke Triton: they sell in large quantities. Giving an indication of how healthy those sales are, Level-5 announced that it has shipped 11.47 million copies worldwide of the four DS Layton games. Nintendo recently announced that 1.9 million copies of Unwound Future had been sold.

In honor of the continued success of the series -- and the February 26 launch of the 3DS's Professor Layton and the Mask of Miracle in Japan -- Level-5 will host a live webcast on Ustream, in which staff and voice actors will give speeches and the game will be shown. This event will take place on February 24 from 7PM to 9PM Tokyo time. The first 500 listeners will even receive a Mask of Miracle charm.

[Image: Inside-Games]

This article was originally published on Joystiq.