According to DailyMail in August 2010, linked here is the world’s toughest sudoku at the time.
It was created by Dr. Arto Inkala, an environmental scientist with a doctorate in applied mathematics. It was generated by a computer program that he devised. The puzzle has only one solution and can take someone 3 days to solve by logic.
The article says …
“So its difficulty – and frustration factor – lies in the number of mental leaps needed to complete each square.
Like chess, those trying to solve it will have to think several moves ahead. Many exasperating deadends have also been built in.”
The solution is linked here.
You can play sudoku online here.
Try out the National Geographic’s Memory Game on their website. It tests your short-term memory by having you memory the location of 9 images in a grid.
Play the game at mah-jongg.ch.
Play game at King.com »
Bricks is a fast pace game with a bit of strategy. You need to click the bricks and change their colors to get three or more in a row before the timer runs out.
Play game at FreeWorldGroup.com »
Tomb Chess is a chess-like strategy game where you can play against the computer or another human. It has rules that are simpler than chess.
Play at JayIsGames.com »
Who knew that rolling a disk around can be so much fan. The physics is amazingly realistic.
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
Play at Gimme5Games.com »
Play here at Gimme5Games.com »
Get the marble into the hole by building ramps and blocks.
Play on 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.
Play the game at mah-jongg.ch/reversi/
This is the classic game of Othello where you play against a computer opponent. Consisting of black and white stones, you place your color stone on the board causing the opponents color stone to flip to your color. Whoever has the most colored stones at the end wins. What is interesting about this game is that it has unlimited undos.