after you press the "test" button alt-tab out of the game and you
will see a new file called "temp.map" move that file to a folder called
"levelextra" and then you go in the game and press "play" you will be
in the game level selection if you look down you will see an option
called "EXTRA MAP" click that and you will see that your test map is
there with the name "undefined" if you didn't change the level name
enter that level and you will be able to test it!