JJWM -- How to Clone the Game Folder
Cloning the game folder will allow you to save your completed game and then begin work on a new Junior Jiffy World Maker Game.
Using this method will create a backup copy of your levels while leaving the levels in the noname folder so that you can start from the previous game.
If you wish to start from scratch you can rename the noname folder (without copying first) then just unzip your downloaded noname starter file.