Problem Collection
We have many ways for you to practice for upcoming competitions:
- Official NACLO problems from 2007 to 2025
- NACLO online practice, an interactive online system that allows you to practice with problems from previous competitions and have them automatically scored
- Sample practice problems (not used in previous competitions)
- Student contributed problems
- Problems from other sources
This list of solve rates of past problems may help you determine which problems to practice based on your experience.
NACLO 2025 Problems
| Name | Solution | Author |
| Fox out of the Box | Solution | Osbel Lopez-Francisco, Lori Levin, and Patrick Littell |
| Swidden in Plain Sight | Solution | Celeste Tan |
| Color Me Confused | Solution | Simi Hellsten and Andrew Lamont |
| Let’s Pivot! | Solution | Daniel Lovsted |
| Around the World in Armenian | Solution | Michael Salter |
| Not Quite Right | Solution | Tom McCoy |
| The Little Dog That Could Read | Solution | David Hellsten |
| There Is Another Hand | Solution | Arul Kolla |
| A Handheld Tablet | Solution | Arul Kolla |
| Nganasan Idol | Solution | Simi Hellsten |
| Going By the Numbers | Solution | Tom McCoy |
| Whistle While You Work | Solution | Evan Hochstein |
| Relative Clauses | Solution | Tom Payne, Patrick Littell, and Daniel Lovsted |
| Something That Is Solved | Solution | Arul Kolla |
| I Speak, Therefore I Am | Solution | Andy Hou |
| The Greatest Thing Since Boiled Breadfruit | Solution | Alex Wade |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions | |
NACLO 2024 Problems
Some PDFs and solutions are not available yet (they are marked with *). Check back later!| Name | Solution | Author |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions* | |
| Holy Roman Shorthand* | Solution* | Sonia Reilly |
| Finding Your Place in Warlpiri* | Solution* | Mary Laughren |
| Happy Birthday!* | Solution* | Michael Salter |
| Generally Speaking* | Solution* | Tom McCoy |
| Japanese From Afar* | Solution* | Arul Kolla |
| Paiwan in Progress* | Solution* | Ethan Chi |
| At a Loss for Words* | Solution* | Pranav Krishna and Lori Levin |
| Evidentially, My Dear Tariana* | Solution* | Babette Verhoeven and Simi Hellsten |
| In the Scottish Highlands* | Solution* | Babette Verhoeven |
| aLLMost, but not quite* | Solution* | Ryan Chi and Ethan Chi |
| I Know a Szpőt* | Solution* | Ethan Chi |
| Some Horses of Their Father* | Solution* | Brendan Bethlehem |
| Maonan Animals* | Solution* | Daniel Titmas |
| A Trip Down Memory Lane* | Solution* | Tom McCoy |
| Allow Me To Demonstrate* | Solution* | Simi Hellsten |
| Stressed Out in Kilivila* | Solution* | Arul Kolla |
| From 1 to 276* | Solution* | Michael Salter |
| Follow the Rules* | Solution* | Ethan Chi |
NACLO 2023 Problems
| Name | Solution | Author |
| The Way We Were | Solution | Cynthia Allen |
| Don't Stress | Solution | Ellie Bultena |
| Vloxes | Solution | Tom McCoy |
| For the Sake of Their House | Solution | Pavel Iosad |
| Bengalese Finch Song | Solution | Malcolm Kennedy |
| A Calabash Calculation | Solution | Ryan Chi |
| Feathers of the Roseate Spoonbill | Solution | Ben LaFond |
| My Grandmother and I | Solution | Michael Salter |
| Show That One for the People | Solution | Michael Salter |
| Marshallese Phonoloji | Solution | Ken Jiang |
| Wordnet Battleship | Solution | Tom McCoy and Aleka Blackwell |
| Camp Not-So-Pleasanthill | Solution | Ali Sharman |
| Tongue Tied in Chukchi | Solution | Simi Hellsten |
| A Saharan Sensation | Solution | Ethan Chi |
| Tone's Puzzle | Solution | Daniel Lovsted |
| Counting in Roon | Solution | Riley Kong |
| What to Wear | Solution | Mijke Mulder |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions | |
NACLO 2022 Problems
| Name | Solution | Author |
| Lines in the Sand | Solution | Michael Salter |
| Who Saw the Bear? | Solution | Tom McCoy |
| To Make a Long Story Short | Solution | Ryan Chi |
| Real Numbers | Solution | Daniel Lovsted |
| Sleeping in the Shade | Solution | Aleka Blackwell |
| Splash to Save | Solution | Catherine Scanlon |
| Out of Order | Solution | Tom McCoy |
| From Soup to Nuts | Solution | Simi Hellsten |
| A Cornish Conundrum | Solution | Babette Verhoeven |
| Sounds Fishy | Solution | Harold Somers |
| A Tough Word to Swallow | Solution | Ryan Chi |
| Stopping for a Spell | Solution | Tom McCoy |
| A Splitting Disagreement | Solution | Gordon Chi |
| Pseudorandom Numbers | Solution | Simi Hellsten |
| Seeing the Future | Solution | Andrés Pablo Salanova |
| Yumology | Solution | Ali Sharman |
| Relatively Speaking | Solution | Simi Hellsten |
| I Stop Being Afraid of This Problem | Solution | Ethan Chi and David Mortensen |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions | |
NACLO 2021 Problems
| Name | Solution | Author |
| The Tortoise and the Rabbit | Solution | Tom McCoy |
| Junk Mail: Letters We Don't Need | Solution | Tom McCoy |
| Versatile Verb | Solution | Aleka Blackwell |
| Made You Look! | Solution | Tom McCoy |
| The Script of Your Dreams | Solution | Ryan Chi |
| The Wiles of Reptiles | Solution | Daniel Lovsted |
| The Skates of Wrath | Solution | Ryan Chi |
| Sequitur | Solution | Pranav Krishna and Daniel Lovsted |
| Non Sequitur | Solution | Daniel Lovsted |
| A Vintage Sound System | Solution | Ethan Chi |
| Putting a Place to a Name | Solution | Harold Somers |
| Is This Problem Intelligible? | Solution | Evan Hochstein |
| The Speech Has No End | Solution | Simi Hellsten |
| Do I Care about Duikers? | Solution | Ethan Chi |
| Cameroonian Compounds | Solution | Aleka Blackwell |
| Family Ties | Solution | Gordon Chi |
| A Stress Test | Solution | Tom McCoy and Ryan Chi |
| GloVe Compartment | Solution | Pranav Krishna |
| Peace Only | Solution | Ethan Chi and Daniel Lovsted |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions | |
NACLO 2020 Problems
| Name | Solution | Author |
| Let That Mongo! | Solution | Kevin Liang |
| A Cat in a Hat | Solution | Aleka Blackwell |
| Set in Stone | Solution | Ethan Chi |
| Pay Attention | Solution | Ethan Chi |
| Breton Numbers | Solution | Michael Salter |
| Coming into Focus | Solution | Sam Ahmed |
| Password Confusion | Solution | Tom McCoy |
| The Idalion Tablet | Solution | Michael Salter |
| Kãa, Kai, and Khai | Solution | Ethan Chi |
| You Made Me See | Solution | Sam Ahmed |
| The Pimpled Toad | Solution | Ethan Chi |
| Shiva Sutras | Solution | Ben LaFond |
| Adjupectiheaval! | Solution | Ethan Chi |
| You Can’t Handle the Truth | Solution | Daniel Lovsted |
| We’re Counting on Yoruba | Solution | Harold Somers |
| Doubling Up on Nakanai | Solution | Ethan Chi |
| Cut to the Chase | Solution | Lori Levin and Tom McCoy |
| The Obviative Solution | Solution | Daniel Lovsted |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions | |
NACLO 2019 Problems
| Name | Solution | Author |
| Malteaser | Solution | Harold Somers |
| You Speak Ndebele, Don't You? | Solution | Michael Salter |
| Here is One Hand | Solution | Daniel Lovsted |
| Predicate Etiquette | Solution | Daniel Lovsted |
| Hate It or Lopit | Solution | Jonathan Moodie and Rosey Bilington |
| Harmongolia | Solution | Ethan Chi |
| Break it Down! | Solution | Tom McCoy and Sonia Reilly |
| Can you know/Hanunó'o | Solution | Ethan Chi |
| The Afrihili Word Machine | Solution | Michael Salter and Aleka Blackwell |
| Polish These Nouns! | Solution | Milena Veneva |
| Two Róngs Don't Make a Right | Solution | Ethan Chi |
| We Were Born to Solve This Problem | Solution | Daniel Lovsted |
| Colorless Green Concepts Scripting Furiously | Solution | Daniel Lovsted |
| Fun With Witsuwit'en | Solution | Daniel Lovsted |
| Infer a Surprise | Solution | Tom McCoy |
| Do You Hear the Master's Moon | Solution | Sam Ahmed |
| A Tale of Kieu-plets | Solution | Ethan Chi |
| Disambiguate This! | Solution | Ethan Chi |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions | |
NACLO 2018 Problems
| Name | Solution | Author |
| At Ease in Gilbertese | Solution | Michael Salter |
| The Pame Game | Solution | Milena Veneva |
| All Roads Lead to Tirana | Solution | Ali Sharman |
| Intergalactic Grammars | Solution | Ali Sharman |
| Parties in Palauan | Solution | Michael Salter |
| A Match Made in Vietnam | Solution | Tom McCoy |
| By the Same Token | Solution | Tom McCoy |
| N'ko, M'kay | Solution | Babette Newsome and Harold Somers |
| A Menya Puzzle | Solution | Aleka Blackwell |
| It's True: The Truth About Chalcatongo Mixtec | Solution | Babette Newsome |
| Sri Lankan Names | Solution | Ali Sharman and Tom McCoy |
| Peeled Potato Act with Annie | Solution | Ali Sharman |
| Quests and Requests in Nivkh | Solution | Heather Newell |
| You've Got This: Fijian Ownership | Solution | Vica Papp |
| To Know or Not to Know Literary Tamil | Solution | Babette Newsome |
| I Know What I Saw | Solution | Harold Somers and Dick Hudson |
| Better Left Unsaid | Solution | Tom McCoy |
| A Make-Shift Code | Solution | Tom McCoy |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions | |
NACLO 2017 Problems
NACLO 2016 Problems
| Name | Solution | Author |
| Tangled up in Nots | Solution | Bozhidar Bozhanov |
| DAWG Breeds | Solution | Patrick Littell |
| The Curious Case of Estonian | Solution | Praveen Venkataramana |
| That's an Order | Solution | Dorottya Demszky, Yiwei Luo, and Tom McCoy |
| Be There, or be Squared | Solution | Bill Huang |
| Take one Tablet and Call me in the Morning | Solution | Dorottya Demszky |
| Signs from Above | Solution | James Hyett |
| Fan Fiction | Solution | Ben King |
| Deriving Enjoyment | Solution | Harold Somers and Simona Klemenčič |
| Get Edumacated | Solution | Patrick Littell |
| Kings, Queens, and Counts | Solution | Tom McCoy |
| The Short Hand of the Law | Solution | Dragomir Radev and Patrick Littell |
| Sound Judgments | Solution | Ollie Sayeed |
| What Happened at the Chess Tournament? | Solution | Vica Papp |
| Don't Sell the House | Solution | Alex Wade |
| A matter of Horn clauses | Solution | Josh Falk |
| A cup of Javanese | Solution | Tae Hun Lee |
| Changing the Subject | Solution | Harold Somers |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions | |
NACLO 2015 Problems
| Name | Solution | Author |
| The Big Dog and the Young Man | Solution | Mike Swan |
| Delphi has the Answers | Solution | Bozhidar Bozhanov |
| Aymara Rules | Solution | Josh Falk |
| Elder Futhark Runes | Solution | Catherine Sheard |
| Use the Force | Solution | Jonathan May |
| My Friend Nomura from Osaka | Solution | Harold Somers |
| Zoink! | Solution | Dragomir Radev, Christiane Fellbaum, and Jonathan May |
| Phaasaa and Phaasaa | Solution | Alex Wade |
| Old English | Solution | Graeme Trousdale |
| Georgian Transitive Verbs | Solution | Dorottya Demszky and Adam Hesterberg |
| The Dualization Game | Solution | Daniel Lovsted |
| Easy-Peasy-Malagasy | Solution | Tom McCoy |
| Minimum Spelling Trees | Solution | John de Nero |
| Maxakali | Solution | Alexander Wade and Pat Littell |
| Do-This-Do-That | Solution | David Mortensen |
| The Old Man the Boats | Solution | Emily Bender |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions | |
NACLO 2014 Problems
| Name | Solution | Author |
| What's the Time in Tallinn? | Solution | Babette Newsome |
| Māori Loanwords | Solution | Patrick Littell |
| Levenshtein's Fine Signs | Solution | Blake Allen and Patrick Littell |
| Wheel of Fortune Cookies | Solution | Patrick Littell |
| Visible Speech | Solution | Natalie Weber and Patrick Littell |
| Lontara | Solution | Chelsea Voss |
| Cameroon Pidgin English | Solution | Aleka Blackwell |
| Bertrand and Russell | Solution | Ben King |
| To play or not to play | Solution | Catherine Sheard |
| Lexicondensed | Solution | Tom McCoy |
| Don't be Ukhrul to a Liver that's True | Solution | David Mortensen |
| Transducing Runes | Solution | Jordan Boyd-Graber |
| Come to Istanbul | Solution | David Palfreyman |
| Hungarian Rocks | Solution | Adam Hesterberg |
| CCG | Solution | Jonathan Kummerfeld, Aleka Blackwell, and Patrick Littell |
| Combining Categories in Tok Pisin | Solution | Jonathan Kummerfeld, Aleka Blackwell, and Patrick Littell |
| Learning Yidiny | Solution | Mary Laughren |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions | |
NACLO 2013 Problems
| Name | Solution | Author |
| Intuitive Inuit | Solution | Harold Somers |
| A Case of Pali | Solution | Babette Verhoeven |
| The Heads and Tails of Huffman | Solution | John DeNero |
| Kwak'wala Word Search | Solution | Patrick Littell |
| Shaw Business | Solution | Babette Verhoeven |
| Grammar Rules! | Solution | Andrea Schalley and Patrick Littell |
| Phoenician Fun | Solution | Harold Somers |
| Twodee | Solution | Jason Eisner |
| Beja | Solution | Richard Hudson |
| Stockholms Tunnelbana | Solution | Patrick Littell |
| Putting the Books in Order | Solution | Dragomir Radev |
| Yesbot | Solution | Patrick Littell |
| Playing the Cognate Game | Solution | Catherine Sheard |
| A Tree by Any Other Name | Solution | John DeNero |
| Warlpiri Kinship Groups | Solution | Alan Chang |
| Deer Father | Solution | Patrick Littell |
| Grice's Grifter Gadgets | Solution | Jordan Boyd-Graber |
| Poles Apart | Solution | Dragomir Radev |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions | |
NACLO 2012 Problems
| Name | Solution | Author |
| Cat and Mouse Story | Solution | Patrick Littell |
| Learn Yolmo with pleasure | Solution | Lauren Gawne |
| Interstellar First Contact | Solution | Simon Zwarts, based on work by Kevin Knight |
| All in the Family | Solution | Dragomir Radev |
| Traevölörs Freisbuk | Solution | Patrick Littell |
| Crocodile Bardi | Solution | Catherine Sheard |
| Haitian Creole | Solution | Ivaylo Youmerski |
| Waorani Numbers | Solution | Dragomir Radev |
| The silence of the goats | Solution | Alexey Pegushev |
| Ik heb voorspeld | Solution | Dick Hudson |
| A fox among the h | Solution | Pat Littell |
| Who is good? | Solution | Dick Hudson |
| The Deschamps Codice | Solution | Alexander Piperski |
| Waanyi | Solution | Mary Laughren |
| The Little Engine that Could...Read | Solution | Pat Littell and James Pustejovsky |
| Jeg kan tælle | Solution | Harold Somers |
| 100 Surnames | Solution | Pat Littell |
| One, Two, Tree | Solution | Noah Smith, Kevin Gimbel, and Jason Eisner |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions | |
NACLO 2011 Problems
| Name | Solution | Author |
| Running on MT | Solution | Harold Somers |
| Mix Up on the Farm | Solution | Lori Levin |
| The War of the Dots | Solution | Patrick Littell |
| Double or Quit in Caterpillar Country | Solution | Mark Dras |
| BrokEnglish! | Solution | Patrick Littell |
| Tiger Tale | Solution | Dragomir Radev |
| Ulwa Possessives | Solution | Richard Sproat |
| Counting in Irish | Solution | Tom Payne |
| A Large Spoon is Enough | Solution | Harold Somers |
| Axolotl in the Water | Solution | John Berman |
| A Script for the Ndyuka | Solution | Patrick Littell |
| Swallow the Salt | Solution | Bozhidar Bozhanov |
| Word Salad | Solution | Eric Breck |
| Stopping and Flapping in Warlpiri | Solution | Mary Laughren |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions | |
NACLO 2010 Problems
| Name | Solution | Author |
| Gelda's House of Gelbelgarg | Solution | Patrick Littell |
| Say It in Abma | Solution | Cindy Schneider |
| Lost in Yerevan | Solution | Dragomir R. Radev |
| Huevos y Pimientos | Solution | Dragomir R. Radev |
| Texting, Texting, One Two Three | Solution | Patrick Littell |
| Türkış Delıt | Solution | Bozhidar Bozhanov |
| Tangkhul Tangle | Solution | David Mortensen |
| Ardhay Uzzlepay | Solution | John Henderson with the assistance of Sophie Crouch, University of Western Australia. Based on Crouch (2008, 2009) and data from the MPI EVA Minangkabau corpus |
| Dogs and cats on trees | Solution | Emily Bender |
| Plains Cree | Solution | Patrick Littell and Julia Workman |
| F u cn rd ths | Solution | Richard Sproat |
| Real Money | Solution | Patrick Littell |
| No smoke without fire | Solution | Aleka Blackwell |
| Tale of Kieu | Solution | David Mortensen and Patrick Littell |
| Possessed in Vanuatu | Solution | Jane Simpson, University of Sydney and Jeremy Hammond, Max Planck Institute for Psycholinguistics |
| Khipu | Solution | Patrick Littell and Erin Donnelly |
| All Round 1 Problems | All Solutions | |
| All Round 2 Problems | ||
NACLO 2009 Problems
| Name | Solution | Author |
| Tenji karaoke | Solution | Patrick Littell |
| Nok-nok! | Solution | Eugene Fink |
| Letters for Cuzco | Solution | Patrick Littell |
| You will be laughing | Solution | Bozhidar Bozhanov |
| Summer Eyes | Solution | Dragomir Radev and Adam Hesterberg |
| Help my camera! | Solution | Emily Bender |
| Sk8 Parsr | Solution | Patrick Littell |
| Linear Combinations | Solution | Richard Sproat |
| Easy Pieces | Solution | Todor Tchervenkov |
| Hypo-Hmong-driac | Solution | David Mortensen |
| The gerbil arrived | Solution | Bozhidar Bozhanov |
| Yak, Du, Dray | Solution | Dragomir Radev |
| Orwellspeak | Solution | Jason Eisner |
| All Round 1 Problems | All Solutions | |
| All Round 2 Problems | ||
NACLO 2008 Problems
| Name | Solution | Author |
| Of monkeys and children | Solution | Ronnie Sim and Thomas Payne |
| Springing up baby | Solution | Ankit Srivastava and Emily Bender |
| Reach for the top | Solution | Patrick Littell |
| Spare the Rod | Solution | Dragomir Radev |
| A Fish Story | Solution | Patrick Littell |
| Fakepapershelfmaker | Solution | Willie Costello |
| Manam, I'm Anam | Solution | Patrick Littell |
| Thorny Stems | Solution | Eric Breck |
| aw-TOM-uh-tuh | Solution | Patrick Littell |
| The Curragh of Kildare | Solution | Todor Tchervenkov |
| Tzolk'in | Solution | Patrick Littell and Erin Donnelly |
| The Whole Spectrum | Solution | Adam Hesterberg |
| All Round 1 Problems | All Round 1 Solutions | |
| All Round 2 Problems | All Round 2 Solutions | |
NACLO 2007 Problems
| Name | Solution | Author |
| We are all molistic in a way | Solution | Dragomir Radev |
| Pooh's encyclopedia | Solution | Eugene Fink |
| A donkey in every house | Solution | Todor Tchervenkov |
| Hmong | Solution | Ivan Derzhanski |
| Better sorry than shunk | Solution | Jason Eisner and Roy Tromble |
| The lost tram | Solution | Boris Iomdin |
| Rewrite me badd | Solution | Patrick Littell and David Mortensen |
| This problem is pretty // easy | Solution | Dragomir Radev |
| All Problems | All Solutions | |
Student Contributed Problems
| Name | Solution | Author |
| Hebrew | Morris Alper | |
| Japanese | Morris Alper | |
| Tamil | Solution | Anand Natarajan |
| Welsh | Solution | Anand Natarajan |
| Yers | Solutions | Anand Natarajan |
NACLO Online Practice
NACLO Online Practice is an interactive online system that allows you to practice with problems from previous competitions and have them automatically scored. Below is a list of problems that are included in this system. Click on a problem's title to be taken to that problem's page.
- 2010
- A. Gelda's House of Gelbelgarg [10 points] by Patrick Littell
- C. Lost in Yerevan [15 points] by Dragomir Radev
- 2011
- A. Running on MT [10 points] by Harold Somers
- 2012
- A. Cat and Mouse Story [10 points] by Patrick Littell
- D. All in the Family [10 points] by Dragomir Radev
- E. Traevölörs Freisbuk [15 points] by Patrick Littell
- F. Crocodile Bardi [15 points] by Catherine Sheard
- H. Waorani Numbers [10 points] by Dragomir Radev
- O. The Little Engine that Could ... Read by Patrick Littell
- 2013
- C. The Heads and Tails of Huffman [10 points] by John DeNero
- G. Phoenician Fun [10 points] by Harold Somers
- 2014
- A. What's the Time in Tallinn? [10 points] by Babette Newsome
- B. Māori Loanwords [15 points] by Patrick Littell
- C. Levenshtein’s Fine Signs [15 points] by Blake Allen and Patrick Littell
Sample Practice Problems
| Name | Solution | Author |
| Agta | Solution | Tom Payne |
| Alliteration | Solution | Jason Eisner and Roy Tromble |
| Ambiguous | Solution | Emily Bender |
| Amharic | Solution | Yekaterina Iassinskaya |
| Anishinaabemowin | Solution | Patrick Littell |
| Cognates | Solution | Dragomir Radev |
| Finite-state transducers | Solution | Richard Sproat |
| Finite-state transducers | Solution | Tom Payne |
| Handwriting recognition | Solution | Tom Payne |
| Hieroglyphics | Solution | Tom Payne |
| Luvian | Solution | A. Zhurinsky |
| Maa | Solution | Doris L. Payne |
| Magicsquare | Solution | John Blatz |
| Phonebook | Solution | Jason Eisner and Roy Tromble |
| Scrabble | Solution | Roy Tromble |
| Tamil | Solution | Eric Pederson |
| Transformations | Solution | Lori Levin |
| Walrus | Solution | Boris Iomdin |
| Weasel | Solution | John Blatz and Jason Eisner |
Problems from Other Sources
- Sample problems from the International Linguistics Olympiad
- Sample problems from the United Kingdom Linguistics Olympiad
- Puzzles from the Princeton Linguistics Challenge
- Problems from the International Linguistics Olympiad
Quick Links
Register for the next competition
Challenge yourself online with practice problems
All you need to know about NACLO for students
All you need to know about NACLO for coordinators
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