Merry Christmas to all who celebrate this day! 🙂 As a small gift for you, I’ve prepared an odd-even sudoku variation puzzle. It’s not the first odd even puzzle I ever posted, but it is the first plain odd even sudoku. And to spice things up a little bit, this is a very difficult odd/even […]
Today we have an extra special puzzle – a Killer Sudoku puzzle by a guest author. It’s been a while since I last posted such a puzzle. I really appreciate the enthusiasm of the visitors to my site and your efforts to make good quality puzzles and share them with others. Today’s puzzle was created […]
This is the insane puzzle I tried sending in June. It seems like it didn’t work. Here it is instead. It’s been a while, hasn’t it? 🙂 I can’t remember when was the last time I posted an INSANE Killer Sudoku puzzle. The INSANE rating is reserved for puzzles that might require some guessing OR […]
Here’s another Anti-Chess sample puzzle: this one’s a bit harder than the last one. This one’s a HARD (4/5…BRAIN/IQ) Anti-King Killer (this puzzle was originally classified insane, but is actually easier than the insane puzzles in the book) Anti-King means that no two cells one king’s move move away from each other in chess can […]
Here is my second Slitherlink puzzle. My solver thinks it’s rather difficult. What do you think? You can read The rules of Slitherlink (Takegaki, loop-the-loop, loopies…). Slitherlink 11×11 for Monday, March 4, 2010. Difficulty: INSANE? Click on the puzzle thumbnail to access the puzzle. Enjoy and do comment, please! 🙂
Here is another Kendoku puzzle where some cells do not belong to any cage. And incidentally, it’s my first INSANE Kendoku, although I don’t think it’s so mad as some of my killers have been. 🙂 8×8 no-cages Kendoku for Thursday, October 15, 2008. CalcuDoku for Thursday, Oct 16, 2008Difficulty: INSANEClick on the puzzle thumbnail […]
The two anti-chess variants anti-knight and anti-camel cannot both exist on a sudoku grid with the standard 3×3 nonets, so I’ve removed the nonets!  In chess, a knight moves 2 cells horizontally and 1 cell vertically or vise versa. Since this puzzle is anti-knight, none of the red X’s below can contain a 5 because the center […]
Rules: Solve the puzzle so that the numbers in every horizontal and vertical region add up to the sum indicated for that region. Numbers CAN NOT be repeated in any region. Additional Rule: The yellow groups of 3×3 blocks contain the numbers 1-9 once and only once.  It took me about 10 hours spread out […]
