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A puzzle book by Blaž Urban Gracar

Discover a vast unknown world and learn its cryptic language

through more than 90 word-search puzzles!


LOK is a book of mind-bending word-search puzzles.

The goal of each puzzle is to find Lok ​keywords and use their special effects to black out all cells in a grid. On top of that, you must also figure out most of the rules by yourself, deducing them from the carefully crafted sequence of more than 90 puzzles, contained in the main storyline, 2 expansions and many off-page enigmas. The result is a deep and rewarding experience with surprising twists and insights.


LOK is available as a physical book. It is spiral-bound and it includes a transparent sheet that can be placed over any page and drawn on with a dry erase marker. Solving puzzles on paper is the way that LOK is meant to be played. Buy it here.


PDF available in English, Japanese and Slovenian

LOK is also available as a free PDF for everyone to enjoy. You can draw over the PDF with any drawing tool software - a good free drawing tool is Drawboard. You can also download the Japanese edition (translated by Competor) and the Slovenian edition. Download the PDF from the LOK's page.


Currently in development

LOK Digital is the video-game adaptation of LOK. Made in collaboration with Raindrinker (Icedrop Games), and published by Draknek & Friends, it expands on the original paper puzzle premise with new puzzles, mechanics and paper-transcending twists. Check out the game.



“... This is cosy, it's thinky, it's robust, and it's just a little bit strange.”

Shut Up And Sit Down Review (starts at 6:46)

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"... I’ve always adored puzzle games, especially those that ask their players to break out of the box ... LOK is too good to leave alone. One more reason Gracar has become one of the up-and-coming designers I’m most eager to watch develop."

- Space-Biff! review

"... While the market is currently flooded with all kinds of derivative logic books filled with computer generated Sudokus and Kakuros, LOK differentiates itself as an ingenious passion project of someone who simply wants to contribute to the world of puzzling."

- Puzzle Prime review

"... So I really enjoyed this ... I liked the way it introduces the rules, because it doesn't tell you strictly the rules, but it just shows you a puzzle and 'Oh, there's a new word! ... This puzzle is solvable, so what does the new word do? ... This word must do something that blacks out these squares,' and so you kind of figure out what it does, which I think is really cool."

- Board Game Blitz review (starts at 1:23)


Playthrough of the first 5 puzzles of the book:

Playthrough stream of LOK by Joe Plays Puzzle Games (click here to watch the full playlist):


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"What’s the difference between a puzzle and a game? Heck if we know. Today’s Space-Cast delves into two puzzle titles by designer Blaž Gracar: the 18-card microgame All Is Bomb and the pen-and-transparent-sheet game LOK. Listen in as we discuss both games, the value of nonsense words, and share some of our favorite puzzle recommendations."

- Space-Biff! Podcast

"... It took me weeks to decide on some miniature details, like the correct font for titles, or the alignment of chapter artworks. Everything needed to match the vision, and it was hard to be certain what is correct in some aspects. But I’m very happy with how it all came together in the end."

- Puzzle Prime Interview

"Blaž Urban Gracar is a multidisciplinary artist from Slovenia, best known for making music for theater and acclaimed puzzle games like LOK and Abdec. With LOK‘s digital version coming to PC sometime this year, we sat down with Gracar to chat about the charming puzzle game’s journey ..."

- Thinky Games Interview


Ava: "I'm faintly worried you just hallucinated the game..." Tom: "It does sound that way, doesn't it?"

- Shut Up And Sit Down Podcast (starts at 29:15)

"... Everybody’s done a word search. But have you done a word search that asks you to black out every single space, bounce around a grid via mind-teasing powers, and decipher nonsense words? That’s Blaž Gracar’s LOK in a nutshell ... Publish these in newspapers and you’d delay the death of print."

- Space-Biff!'s Best of 2022

"... Equally, the great pen and paper puzzle game LOK, which goes out of its way to have no rules explanation at all and teaches purely through discovery ..."

- Adam Millard - The Architect of Games (starts at 6:24)

"... In chapter one it's like when you're learning a language in a classroom, with teachers and students ... Chapter two is like when you're using a dictionary or Google Translate, you kind of get the grasp of it, you just need to get a quick confirmation, "What's that word, oh right, I understand it, I can use it in a sentence,' ... Then from chapter three onwards, it's like you're in the country and you're just watching and you're observe and you're trying to pick up what you can and put it in a some sort of a context ..."

- The Staying In Podcast (starts at 12:28)

"... LOK was also a particular highlight of 2022. It was such a delight to sit down away from the screen with a book of beautifully formatted puzzles. I love the moment it basically just says 'This puzzle is solvable. Figure out the rules.' ..."

- Thinky Games' Highlights of 2022

"... Blaž Urban Gracar, a multidisciplinary Slovenian artist is the brains behind LOK. The premise of LOK is simple, find keywords (eg. “LOK”) and use their powers (eg. “Shade any one block”) to help you complete the puzzle ..."

- Thinky Games' Thinky Books Gift Guide

What is on the T-shirt? (Semi Coop Webcomic)

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Join the Letibus Design's official Discord Channel for hints, solutions and other discussions about LOK and other Letibus Design games.

You can also sign up to Letibus Design's Newsletter to learn about new games, books and other merch.

Letibus Design is present on Twitter, Instagram and Facebook.

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LOK was made by Blaž Urban Gracar, a Slovenian artist. He is a musician (composing music for theatre, producing left-field electronica, playing keyboards in a rock band), writer (publishing poetry, prose and comic books), filmmaker (editing and animating short films) and game designer (mostly creating puzzly solo games). He lives by the sea with his partner, her daughter, three cats, a dog and a turtle.


Published by

Letibus Design

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© 2024 by Letibus Design /

Blaž Urban Gracar

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