No, but some can be quite close at times. Something like FFXII for example, that gives you a ton of freedom and lots of stuff to do. It's close, but not quite a Sandbox because they don't give you the same amount of freedom. It's a similar feel though.
I kind of prefer that style though. It's freedom with structure.
Math problems are the ultimate trick question. No matter how straight forward and simple they seem, the answer is never what you think it is.