You can view any levels of Gridcosm in that viewer. To start at a specific level, just change the value of "STARTLEVEL" in the URL. So, if you want to start at level 2383, just change "STARTLEVEL=2000" to "STARTLEVEL=2383".

...gridcosmviewer.swf?STARTLEVEL=2000

You can also go to a specific level from the HTML interface of Gridcosm by clicking "Flash Viewer" in the SITO menu bar when you're on a specific level.

Eventually, I'll put "jump to level" controls in the Flash interface itself.