Atari, Inc announced the meaning behind the mysterious countdown on the
official Godzilla: Unleashed web site. It was revealed today that there
will be 23 monsters in the upcoming Wii title, many of which are making
their debut in a game for the first time. This is the largest number of
playable monsters ever in the popular series and features two entirely
new monsters created specifically for this title.

Godzilla: Unleashed immerses players into a world where monsters are
larger than life and the mother of all giants reigns. Specially
designed for the Wii controllers, the game stars the legendary Godzilla
and a slew of the most renowned monsters to control, destroy and fight.
Gamers are challenged to ultimately save the planet from mayhem and
complete annihilation. Godzilla: Unleashed provides an environment
perfect for epic worldwide obliteration with interactive 3D cityscapes,
an innovative non-linear storyline, big destructible buildings, soaring
skyscrapers and towering alien formations. The title is also being
developed for Nintendo DS and PSP (PlayStation Portable) system.

http://www.atari.com/godzilla/