I think if you remove the answer box with all the states in alphabetical order it becomes a tougher quiz. I forgot Missouri at first; when I looked at the answers I realized I forgot the one between Mississippi & Montana, then it was easy. Without the states in front of you it poses a better challenge...just my opinion.
If you write California, Idaho, Kentucky, Massachusetts, Missouri, Nebraska, Nevada, New Jersey, Texas, Utah, Virginia and Wyoming, all the remaining states will have seashores.
In the table below the disappearing map, one of the V states is sandwiched between W states.