The Sovereign Military Order of Malta isn't a state. It is a Catholic religious order. The Republic of Malta is however a state and has full United Nations member status.
@Gamer1162 actually isn't wrong, @Milanthro . The Sovereign Military Order Of Malta, as well as other organizations, are/have been considered observer states throughout the history of the UN's formation. There's only been 1 organization that is considered a former observer of the UN. Of course, it is your choice whether to include said organizations or not, but I thought I'd add this piece of information for both of you and any other people who take this quiz and would like to know a bit more about the UN. Great quiz idea!