The main reason it's wrong in this case is because Worlds is a proper name and you don't change it. Just like if you were writing something about Sears, you don't add an apostrophe because that's the name of the store.
There are two times when you use an apostrophe. One is a contraction with the word "is". Like at a restaurant if I say "This bill's wrong." Another is if the word is possessive (like @
SRF4 mentioned above). So I could say "This bill's total is wrong."
But you don't add one if it is plural like "Why did we get two bills?"
Finally if you have a word ending in "s" and you want to make it plural, the apostrophe goes at the end of the word with nothing following, "Mr. Sears' bill is for the whole table.