This patch enables the full Level Editor that was In the development stage, there was an option to change the level number in the level editor and edit the corresponding level. The first level is a special case, saved only in RAM, where you can play it right away. Levels greater than 1 can be edited and more importantly can be repackaged into the main game's level storage. The code for the packaging levels is still there and works, but since the cartridge is a ROM, they can't be saved. Only possible by using some development device with RAM in the 8000-FFFF area you can select any level to modify by pressing Select . Since there is no RAM, any edits will be discarded anyway. The final version of the level editor cannot handle the bonus rounds and special graphics for it. They also have some special cases to skip unused tiles, like the little heart