About Our Contributors

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Grandmaster Puzzles is proud to present its up-to-date list of Contributing Puzzlemasters. Selection is difficult and generally requires a solid length of time producing amazing puzzles (while many can be Contributors, few can be considered Puzzlemasters too!). The people on this list are here because they are some of the finest puzzlemakers around.


Grant Fikes has been experimenting with logic puzzle construction for many years, first on LiveJournal and then, after honing his craft, on Blogspot. His “A Cleverly-Titled Logic Blog” now has over 700 puzzles. Grant’s puzzles have appeared in Akil Oyunlari, Sudoku Xtra, the 2012 and 2013 US Puzzle Championships, and two Logic Masters India tests co-authored with Palmer Mebane. Grant is also the designer of the board game Battle of LITS, a two-player game inspired by the logic puzzle LITS. Online, Grant is represented by a purple-and-cyan anthropomorphic fox/badger hybrid.


Serkan Yürekli has truly devoted himself to logic puzzles. Serkan served as the chief editor of Akıl Oyunları, a Turkish puzzle magazine; he has also authored many puzzle books, provided puzzle training for students and teachers, and organized school competitions in collaboration with the magazine. He started preparing puzzles in 2005, and the results of his efforts included dozens of new puzzle types. Tapa is probably the most famous one among his inventions. He has also been organizing and contributing to online and offline puzzle competitions like OAPC, WPC, TVC and USPC. Some of his puzzles can be found online in his puzzle blog, The Puzzle Robot.


Prasanna Seshadri is a 25-year old puzzlemaster from India. In 2013, he was the Indian Double Champion, winning both the Indian Sudoku and Indian Puzzle Championships. He holds the best individual ranking by an Indian at the World Sudoku Championship (7th) and World Puzzle Championship (19th). As a puzzlemaker, Prasanna co-authored the Sudoku Mix book released by Logic Masters India and has contributed puzzles to many national and international championships including the WPC, the 24HPC, the Sudoku Grand Prix, and the Puzzle Grand Prix. He plays an important role in expanding puzzling in India by helping with the LMI Beginners’ contests and by organizing workshops and other events like Brain Games, Sudoku Mahabharat, and Puzzle Ramayan. He was the lead trainer of the Indian Juniors Team that placed 2nd at the WJSC in 2015. Many of his puzzles can be found on his puzzle blog where he has been posting since January 2012.


Murat Can Tonta, or anagrams thereof, is a 24-year old from Turkey. An enthusiastic puzzle solver for years, he was inspired by the magazine Akıl Oyunları and authors like Serkan Yürekli to try his hand at designing puzzles. A regular contributor to Akıl Oyunları until its discontinuation, Murat has also authored a tiny puzzle book, a puzzle set for Logic Masters India, and puzzles for the World Puzzle Championship, the 24HPC, and inter-school competitions. He is an author and judge at PuzzlePicnic. His hobbies include narrowly failing to qualify for the WPC every year.


Palmer Mebane, or MellowMelon online, is a 26-year-old from the USA. He works as a developer and educator at Art of Problem Solving and spends the rest of his time on math problems or logic puzzles. He won the US Puzzle Championship in 2011 and 2013, and he was 1st after the preliminary rounds at the 2013 World Puzzle Championship. On the authoring side, he has posted hundreds of puzzles on his former blog Melon’s Puzzles, and he cowrote a number of competitions such as both Fillomino-Fillias at Logic Masters India (with Grant Fikes) and the Team USA rounds for the 24HPC in 2012 and the WPC in 2013 (both with Thomas Snyder and Wei-Hwa Huang).


Tom Collyer has been solving puzzles since the Times ignited the worldwide sudoku craze in 2004. Initially something of a sudoku specialist, his puzzling enthusiasm was further developed after discovering nikoli.com. Deciding this was an excellent distraction to his PhD studies, in 2009 he began publishing a regular “Friday Puzzles” feature on his blog detuned radio, which continues to this day. He has also been heavily involved with the newly founded UK Puzzle Association. As a solver, he is a regular fixture at WSC’s and WPC’s representing the UK; as an author, he was the Competition Director of the 9th WSC, and has also organized and contributed to numerous international competitions, as well as the Daily League sudoku project.


John Bulten, former puzzle editor for news network WND, is a groundbreaking enigmatologist. He read GAMES magazine in the 70s and became an expert on sudoku and Bible codes in the 80s, before any of them were mainstreamed. A voluble National Puzzlers’ League and “Word Ways” author, John invented the 3-D crossword and coauthored the first word-rank crossword dictionary. John organized tournaments as director of the Tulsa Scrabble Club but claims no need to defend his top 100 ranking; he would rather keep teaching puzzlemaking to his wife and three children, and publishing unique research and analysis on ancient enigmas and modern puzzles as puzzler.guru.


Carl Worth first gained his love for puzzles by growing up in a puzzle-loving family with a subscription to GAMES magazine and regular brainteasers posed at the dinner table (Martin Gardner was a frequent source). He finds that puzzle-solving shows up in many of his activities, from computer programming to rock climbing. His interest in puzzle construction began with a set of annual Christmas puzzles he has written for his children for several years. He now contributes regularly within the National Puzzler’s League and has also had puzzles featured in the US Puzzle Championship.


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