Here is a 4×4 KenKen game generator where you can play some KenKen games. If that is too easy, try the 6×6 KenKen below.

The Origins
The KenKen puzzle was introduced by Japanese math teacher Tetsuya Miyamoto in 2004. The KenKen puzzle comes in the form of a grid of squares commonly in the dimensions of 4 squares by 4 squares, 5 squares by 5 squares, 6 by 6, 7 by 7, and 8×8, and 9×9. The larger the grid, the more difficult the puzzle.

If you are new to this puzzle, watch video introduction of the KenKen game.

The Rules
In the grid, groups of squares form “cages” indicated by their bold outlines. In the upper-left of each cage, is a number with a mathematical operation. You have to put digits in the squares such that the mathematical operation of those digits results in that number. The digits can be in any order. But you can not have a repeat of a digit in any row or column of the larger grid.

And you can only use digits up to the size of the grid. For example, if your grid is a 5×5 grid, then you can only use the digits 1, 2, 3, 4, 5 to fill into the squares.

Other Places to Play

• KenKen.com

You put digits from 1 to 9 in the empty squares. Each column and row should have one and only one unique digits. In addition, each of the nine smaller 9×9 grids should only contain one of each digit. In other words, no duplicate digits in any columns, rows, or marked inner 9×9 grids.

Posit Science produces products that improves brain fitness. Most notably, the Brain Fitness program and the InSight product. Jewel Diver is a demo game from the Insight product that helps you keep track of multiple moving objects. You can find some of their brain teasers that focuses on memory attention and sound discrimination as linked.

Hear what Dr. Merzenich, co-founder of Posit Science, have to say about brain fitness.

If you like doing Sudoku puzzles, you will like this variant of the puzzle by Scientific American known as “Sci-doku”. It uses letters instead of numbers. As with normal sudoku, each row, column, and nine-cell grid must contain one and only one of the nine letters. You can not just use any nine letters, you have to use the letters that are already shown on the grid.

Here are the full rules.

Play the Sci-doku games »

Found this game called “Contour” on Kongregate.com. Play game here »

You guide a marble to its goal by applying contours to the playing surface. You can even create and edit your playing field.

We found this game from Gimme5games.com. An unique strategy game where you try to open gates to get the two characters through the maze to each of their destination.
(more…)

Phantom Mansion is a game containing puzzle room where you have to navigate Hector to collect souls and make it to the exits. There are many sequels of this game. Here is one that is called the Blue Ballroom …
(more…)

Exercise your 3D spatial reasoning skill with this puzzle game. I got stuck at level 11. The graphics on this game is very well done.
(more…)

Play the game at mah-jongg.ch.

This game was programmed by Thomas Weibel using DHTML and Javascript. The object of the game is to remove tiles that are “open” on the left and the right. Don’t worry, if you can’t see any open tiles, there is a “hint” button that may reveal moves that you did not see. There is also a “zoom” button if you find the tiles to be too small and is straining your eyes. Note that not all games can be won. However, good players can sometimes win one out of every three games.

Do you Sudoku? Play sudoku online at mah-jongg.ch/sudoku/.

A logic game where you have to use your deductive skills. Fill in the grid of numbers such that any row, column, the designated 3×3 sub-grids contain all the digits from 1 to 9.