Really sorry that I found replies just now. Actually, don't know how to find my replies and threads yet.
Yeah I'm ok now with Pets. The reason I asked the custom worlds without pets is because I've experienced that I can't load the world which is built with Pets. When I asked this question, Pets was already had uninstalled. Without Pets in my game, I can't open the world. I have only one choice to get the world as a save file. i don't want that kind of world file. Also everytime I open the world as a save file, I have to see the message "Items missing" and its quite annoying to me.
For examples, I created a very small world before to learn how to build a world. I created it when Ihad showtime installed. After a while, I uninstalled showtime, I couldn't open the world I created! I was an
Ble to open the world as a save file only. I'd like to open the world as a new game in the main menu.
My English is not so good so possibly you may not understand well.
I want to be polite but if not, please let me know.