Last week I posted a Calcu-doku variant that I thought was pretty cool. The sudden motivation to explore this concept, which I'd been holding onto for awhile, was the discovery of a hilarious error with some official KENKEN(R) puzzles that couldn't even be corrected right. While I loved the text of my entry, in the rush to make a puzzle that fit a #23 theme I cut some corners and added in an extra constraint to the first 23-only grid I found to make it solvable; to restate your comments on this "fix" succinctly: the shaded cells were not appreciated.

Well, the very first Number Place puzzle had four circled cells that clued a small subset of numbers for those squares. We can agree that the proper form of a sudoku does not have circled cells just as the proper form of these calcu-doku should not have any extra constraints in shaded cells even if the first attempt at such a puzzle had this weakness. Since I really think Multi-Operation Calcu-doku offers some good challenges, I've tried to write some "proper" puzzles this week to reintroduce the concept. While "Parquet" should be rather approachable, the larger "Double Trouble" puzzle has some really fun deductions necessary to solve it.

18 = ((1+5)*3) or 1+5 ->6 *3-> 18

Well, the very first Number Place puzzle had four circled cells that clued a small subset of numbers for those squares. We can agree that the proper form of a sudoku does not have circled cells just as the proper form of these calcu-doku should not have any extra constraints in shaded cells even if the first attempt at such a puzzle had this weakness. Since I really think Multi-Operation Calcu-doku offers some good challenges, I've tried to write some "proper" puzzles this week to reintroduce the concept. While "Parquet" should be rather approachable, the larger "Double Trouble" puzzle has some really fun deductions necessary to solve it.

18 = ((1+5)*3) or 1+5 ->6 *3-> 18

**Rules:**In each n x n grid, fill each cell with a number from 1 to n so that each number appears exactly once in each row and column. Each grid also contains several rectangular cages whose cells are labeled with either a number or a mathematical operation. Proceeding from the cell with the numerical value and going through the connected cells in order, performing operations as they are encountered, the digits placed inside the cells will evaluate to the indicated value (as in the example cage above).10 comments | Leave a comment