Sample problems
If you become a member, you have access to puzzles from the previous month (starting from the 11th of each month). We will make newly released puzzles available for 180 days, so if you are a member for 5 months, you will have 600 original problems to do anytime.
Slitherlink (Slither Link)
Getting the loop right is absorbing and addictive. Watch out not to get lost in Slitherlink. It's amazing to see how endless patterns can be made using only four numbers (0, 1, 2 and 3).
Nurikabe
Nurikabe stands for "painting walls." The black cells form walls to separate white areas. Watching the walls stretch and link the black cells gives a very real sense of achievement.
Heyawake
Heyawake is another Nikoli original puzzle. "Heya" means "room," "wake" means "divide," so here you divide the board into rooms.
Akari (Light Up)
Akari was developed by Nikoli in 2001. This puzzle has very simple rules, but they lead to a complex logical world.
Hitori
Erase extra numbers to leave only one of each in a row or column. This is a cool puzzle, don't lose yourself in it!
Masyu
Make a single loop with lines passing through the centers of cells, horizontally or vertically. The loop never crosses itself, branches off, or goes through the same cell twice.
Shikaku (Divide by Box)
Shikaku is another original Nikoli puzzle, which provides a special sense of solving while complying with a very simple rule. Shikaku is also a great math trainer for kids. While playing the game they learn multiplication such as a 12 can be 1x12, 2x6 or 3x4. And if you get stuck, look at the puzzle from a distance and you will soon find the next rectangle.
Kakuro
As a beginner you need to add and subtract, but when you get used to Kakuro you will learn to rely more on logic and less on calculations. You'll be amazed at how fast you improve. And the interesting thing about this puzzle is that beginners and experts are able to enjoy the same puzzles.
Sudoku
Sudoku is a simple and friendly puzzle. Its 9x9 world has its own deep acute logic. There is pure enjoyment when, after thinking hard, you can place a number.
