What the improvement does: I often use Yadex to view the levels created by others. I find that it makes a good level viewer as well as level editor. As a level viewer, however it lacked one useful feature "Find by type". If you are in the sector editing mode "Find by type" lets you look for a sector by its type. (Say you are looking for a secret area then find by type 9) If you are in thing editing mode then "Find by type" lets you look for an item by its type (where is the yellow key card?). If you are editing linedefs then "Find by type" lets you look for a line by its type (Where is the end of level switch?) The "Find by type" feature is fully integrated into the menu system and uses sub-menus to select the sector/item/line types. The find operation searches from the currently highlighted item to the last item of the edit-mode type until it finds a match. In this way one can find (all of the secret areas) for example. To insure that the item will be found, it is often convient to use the "J 0" command before the find command to jump to item number zero before the search begins. Each find is like a find next. To go back to the beinning do a "J0". Just apply the diff files as patches to the files in the yadex/src directory and do a make & (root) make install.