IOL Problems and Solutions

Running since 2003. Contestants are given self-contained puzzles in languages they have almost certainly never seen, so knowing a language in advance helps nobody: everything needed is on the page. There is an individual contest and a team contest.

2025

Taiwan

Individual Contest5 problemsProblemsSolutions
  • 1Dzongkhanot published
  • 2Gaahmgnot published
  • 3Kurianot published
  • 4Kewanot published
  • 5Kaqchikelnot published
Team Contest1 problemCamling and BantawaProblemSolution

2024

Brazil

Individual Contest5 problemsProblemsSolutions
  • 1Koryaknot published
  • 2Hadzanot published
  • 3Komnzonot published
  • 4Dâwnot published
  • 5Yanyuwanot published
Team Contest1 problemLexicostatisticsProblem
  • 6Team ContestLexicostatisticsProblem

2023

Bulgaria

Individual Contest5 problemsProblemsSolutions
  • 1Guazacapán Xinkanot published
  • 2Apurinãnot published
  • 3Coastal Marindnot published
  • 4Plains Creenot published
  • 5Supyirenot published
Team Contest1 problemMurrinh-pathaProblemSolution

2022

Isle of Man

Individual Contest5 problemsProblemsSolutions
  • 1Ubykhnot published
  • 2Alabamanot published
  • 3Nǀuuki (Nǁng)not published
  • 4Arabananot published
  • 5Proto-Chamic, Phan Rang Cham and Tsatnot published
Team Contest1 problemManchuProblemSolution

2021

Latvia

Individual Contest5 problemsProblemsSolutions
  • 1Ekarinot published
  • 2Zuninot published
  • 3Kilivilanot published
  • 4Agbirigbanot published
  • 5Rikbaktsanot published
Team Contest1 problemGarífuna, Lokono and Kari’ñaProblemSolution

2019

South Korea

Individual Contest5 problemsProblemsSolutions
  • 1Yonggomnot published
  • 2Yuroknot published
  • 3Book Pahlavi scriptnot published
  • 4West Tarangannot published
  • 5Nooninot published
Team Contest1 problemRhythmic GymnasticsProblemSolution

2018

Czechia

Individual Contest5 problemsProblemsSolutions
  • 1Creeknot published
  • 2Hakhunnot published
  • 3Terênanot published
  • 4Mountain Arapesh (Bukiyip)not published
  • 5Akannot published
Team Contest1 problemMẽbêngôkre, Xavante and KrĩkatíProblemSolution

2017

Ireland

Individual Contest5 problemsProblemsSolutions
  • 1Biromnot published
  • 2Abuinot published
  • 3Kimbundunot published
  • 4Khom script/Lavennot published
  • 5Madaknot published
Team Contest1 problemEmoji/IndonesianProblemSolution

2016

India

Individual Contest5 problemsProblemsSolutions
  • 1Aralle-Tabulahannot published
  • 2Luwiannot published
  • 3Kunuz Nubiannot published
  • 4Iatmülnot published
  • 5Jaqarunot published
Team Contest1 problemTaaProblemSolution

2015

Bulgaria

Individual Contest5 problemsProblemsSolutions
  • 1Nahuatl and Arammbanot published
  • 2Kabardiannot published
  • 3Soundexnot published
  • 4Wambayanot published
  • 5Somali Masafonot published
Team Contest1 problemNorthern SothoProblemSolution

2014

China

Individual Contest5 problemsProblemsSolutions
  • 1Benabenanot published
  • 2Kiowanot published
  • 3Tangutnot published
  • 4Engenninot published
  • 5Gbayanot published
Team Contest1 problemArmenianProblemSolution

2013

United Kingdom

Individual Contest5 problemsProblemsSolutions
  • 1Yidinynot published
  • 2Tundra Yukaghirnot published
  • 3Pirahãnot published
  • 4Munanot published
  • 5Telepathynot published
Team Contest1 problemGeorgianProblem

2012

Slovenia

Individual Contest5 problemsProblemsSolutions
  • 1Dyirbalnot published
  • 2Umbu-Ungunot published
  • 3Basquenot published
  • 4Teopnot published
  • 5Rotumannot published
Team Contest1 problemLaoProblemSolution

2011

United States

Individual Contest5 problemsProblemsSolutions
  • 1Menomineenot published
  • 2Faroesenot published
  • 3Vainot published
  • 4Nahuatlnot published
  • 5EAN-13not published
Team Contest1 problemSanskrit PoetryProblemSolution

2010

Sweden

Individual Contest5 problemsProblemsSolutions
  • 1Budukhnot published
  • 2Drehu Numeralsnot published
  • 3Blissymbolicsnot published
  • 4MRNA Sequencingnot published
  • 5Romanschnot published
Team Contest1 problemMongolianProblemSolution

2009

Poland

Individual Contest5 problemsProblemsSolutions
  • 1Sulkanot published
  • 2Maninka and Bamananot published
  • 3Burmese Namesnot published
  • 4Old Indicnot published
  • 5Nahuatlnot published
Team Contest1 problemVietnameseProblemSolution

2008

Bulgaria

Individual Contest5 problemsProblemsSolutions
  • 1Micmacnot published
  • 2Old Norsenot published
  • 3Drehu and Cemuhînot published
  • 4Copainalá Zoquenot published
  • 5Inuktitutnot published
Team Contest1 problemFanqieProblemSolution

2007

Russia

Individual Contest5 problemsProblemsSolutions
  • 1Braillenot published
  • 2Movimanot published
  • 3Georgiannot published
  • 4Ndomnot published
  • 5Turkish and Tatarnot published
Team Contest1 problemHawaiianProblemSolution

2006

Estonia

Individual Contest5 problemsProblemsSolutions
  • 1Lakhotanot published
  • 2Catalannot published
  • 3Khmernot published
  • 4Udihenot published
  • 5Ngoninot published

2005

Netherlands

Individual Contest5 problemsProblemsSolutions
  • 1Tzotzilnot published
  • 2Langonot published
  • 3Mansinot published
  • 4Yorubanot published
  • 5Lithuaniannot published
Team Contest1 problemFiguigProblem

2004

Russia

Individual Contest5 problemsProblemsSolutions
  • 1Kayaponot published
  • 2Swift News Agencynot published
  • 3Latinnot published
  • 4Lakhotanot published
  • 5Chuvashnot published
Team Contest1 problemArmenianProblem