NACLO 2027 Open Round — US sites

The three-hour Open Round uses reasoning puzzles about languages, writing systems and computational patterns. No prior linguistics, foreign-language or programming knowledge is required. The Jan 28 open contest identifies students invited to the harder four-hour round on Mar 18, 2027. Invitational scores and possible further assessments select eligible national IOL teams; selection is not guaranteed. This entry is for registered US venues chosen by the student, so no single city is assigned. NACLO does not offer a general online option in 2027; narrow homeschool and emergency exceptions need prior organizer approval.