Goto your admin panel
from the arcade section click on games
then click on one of the games which allows you to edit that game
look at the INTERNAL NAME of that game
then look at the FILE NAME of that game
the internal name must be EXACTLY the same as the file name BUT with the .swf at the end taken off
as an example
internal name = avoider
file name = avoider.swf
the internal name must not say Avoider with a big 'A' but avoider with a small 'a'