This blog deals with grid-based puzzles and the various types of logic and ideas used to solve them. It also contains notices, information and results about various puzzle and sudoku championships across the globe.
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Rules of 'Blackout Sudoku'
Place numbers in the grid such that each row, column and 3x3 box contain distinct numbers. Shaded cells dont contain any number.
I work on each 3x3 box independently and solve as much as I can before moving to the next 3x3. I keep rotating through all the 3x3s until I solved. Solving these requires a different angle of approach. The blacked out cells represent a "missing" number, but depending on the row or column or 3x3 square that you are looking at the missing number could be different, i.e. the row could be missing a 2, the column missing a 4 and the 3x3 square is missing a 7. Key point: you should only use "definite" entries within the rest of the row/column/square to decide on whether a number is possible for a single cell in the 3x3 that you are working on (i.e. dont use "potential" entries within the rest of the row/column). Make indications for all the possibilities for each cell in a square, then you often find at least one cell that can only be one specific number; mark that one as definite and re-review all your possibles based on the new definite. Keep cycling this way until you solve al cells. Blackout is now my favorite variant. My problem is finding them. I like to work in printed books, but I cant find any books with blackouts puzzles.
5 comments:
This is one of the most trickiest sudoku variations.
As of what I have heard, this sudoku has been recently invented and it is one of the newer variations of sudoku.
can you share how to solve this kind of puzzle ( blackout sudoku) because i can't start solving it? Thanks
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Did you ever figure out how to do these? I don't get it!
I work on each 3x3 box independently and solve as much as I can before moving to the next 3x3. I keep rotating through all the 3x3s until I solved.
Solving these requires a different angle of approach. The blacked out cells represent a "missing" number, but depending on the row or column or 3x3 square that you are looking at the missing number could be different, i.e. the row could be missing a 2, the column missing a 4 and the 3x3 square is missing a 7.
Key point: you should only use "definite" entries within the rest of the row/column/square to decide on whether a number is possible for a single cell in the 3x3 that you are working on (i.e. dont use "potential" entries within the rest of the row/column). Make indications for all the possibilities for each cell in a square, then you often find at least one cell that can only be one specific number; mark that one as definite and re-review all your possibles based on the new definite. Keep cycling this way until you solve al cells.
Blackout is now my favorite variant. My problem is finding them. I like to work in printed books, but I cant find any books with blackouts puzzles.
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