I decided to transform the pack.png world
Cheats are enabled
Don't try to use the seed, it doesn't work, I have already tried
How to install it
Windows
1- Open the ''world1_'' file and extract it
2- Press Windows+R
3- Write ''appdata'' on the box
4- Open ''Roaming''
5- Open ''.minecraft''
6- Open ''Saves''
7- Move the ''World1'' to ''Saves'' (The folder that you extractedbefore)
Mac
1- Open and Extract the file
2- Open ''Library'' (you can use Spotlight to locate it)
3- Locate and open ''minecraft''
4- Locate and open ''saves''
5- Move the ''World1'' folder to ''saves''