What's wrong with Ludi in urbe suntne?
That is what I put because so many times words like "sunt" and "est" are put at the end.
-ne is usually attached to the end of 1st word of the sentence.
-ne (interrogative enclitic)
1. Added to the end of a word in a phrase (usually the first word) to make it a question.
(From Wkitionary)