There are 2 maps hidden in the files that are not accessible for PvE or PvP.
Menu Background[]
The dynamic background of the main menu. The map doesn't extend past the borders, there are no player spawn points or domination/capture the flag points. If played like a normal map the minimap is a black square and doesn't display viewed area bounds correctly. Only friendly units are displayed on the minimap, they aren't visible, give no vision, can't be selected, don't fight. Even landmines don't kill.
Test[]
Tiny map with a big elevation peak in the center. There's no player spawn points or domination/capture the flag points. Not broken like the main menu. The purpose is unknown.