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.
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.
This is one of the most trickiest sudoku variations.
ReplyDeleteAs 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
ReplyDeleteDid you ever figure out how to do these? I don't get it!
DeleteSudoku Online
ReplyDeleteSudoku Online
Sudoku Online
Sudoku Online
Sudoku Online
Sudoku Online
Sudoku Online
Sudoku Online
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.
ReplyDeleteSolving 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.