"Nazi Zombies: Portable" recreates Nazi Zombies on the PSP.
Worked more on this.
So how this works.
First player presses Get maps. Then the game starts downloading a file that contains list of maps(map name, author and version)from our website. Then player can scroll around the list. When they press select a screen pops up. There will be either Do you want to download, do you want to update or (as above) do you want to launch the map. This is bit "not right way" to do it and is little unclear is psp going to have this feature (i higly hope it ;) )