A nice home made Jump map for kids above 4 jears
To install this map, first of all download the Jump map for Minecraft 1.7.2.
Extract the files to your desktop with WinRar.
Open the start menu and search for %appdata%.
Go to /.minecraft/saves and drag and drop your files into there.
Launch Minecraft and select the right save file.
Enjoy your new Minecraft Jump map!