The form requires all fields save for second address line filled. The state/province line is also required, however only allows 2 characters while I live in Finland and we don't have the same kind of abbreviations for states as, say, United States. Trying to leave the line empty, it also states "State/Province must have a valid value", so random abbreviation of my state could be wrong if any is accepted.
I also checked the contest rules and it clearly states the contest is international. The form simply does not support this.