Result of the 221st nikoli.com Puzzle Championship Aug 22, 2015
Congratulations! tokunakira won the 221st puzzle championship! The winner's name is now displayed and will remain on the Champion page of nikoli.com Hall of Fame.
The next puzzle championship will be held from Fri. Sep 4, 2015 13:00 (UTC). The time trial problem will be a Heyawake puzzle contributed by the ax and sword.
Maintenance finished Aug 21, 2015
About 10 minutes after 05:00 Aug 21, 2015(UTC).
Due to scheduled maintenance, you could not access to the nikoli.com. Sorry for the inconvenience.
The Nikoli Derby - 15th world championship Aug 17, 2015
Please join nikoli original easygoing party game The Nikoli Derby. The winners will receive an original Nikoli T-shirt.
Added Botsu Bako problem Aug 11, 2015
Guten's Akari problem is open to members. Try it out on the Botsu Bako (Extra Special Problems) page in the members area.
Added Akari and Hashiwokakero puzzles to The pick of the puzzles page Aug 3, 2015
Most popular Akari and Hashiwokakero puzzles are available to members. Play them in the members area, in The pick of the puzzles page.
One Layout Sudokus Jul 17, 2015
This is our 3rd "One layout" project. Here we have 20 of these sudoku puzzles. Try them out!