Animal Crossing New Leaf megathread: The economy of Bells, Fruit and Turnips.

Why, what did it do in wild world?

http://animalcrossing.wikia.com/wiki/Seeds_(hacking)



It became possible to add rocks to one's inventory, which by consequence meant that people were able to drop the rocks in front of critical places in other peoples' towns (say, your gates, which meant you'd never be able to play online on that save file again). If a player were to drop houses in another persons town, it ran the risk of corrupting the victim's savefile altogether.

This was also of course compounded by the millions of bells, rainbow feathers, and crowns floating around (all very valuable items) thanks to the editor, but the "seeds" were the real issue.