GridbinderGridbinder · Anti-Knight Sudoku
Anti-Knight Sudoku puzzle book maker for KDP and e-ink
Anti-Knight Sudoku adds a chess rule to the grid, and it suits readers who want something more than plain Sudoku. We did not find it in any KDP puzzle generator we looked at, so it can set a Sudoku book apart as long as every puzzle is fair.
Choose the levels, the trim size and the number of puzzles. Gridbinder makes the puzzles, the how-to page with the knight rule explained, the answer key and a Verification report. A free 12-puzzle sample with a watermark needs no account.
12 puzzles with your settings, watermarked, no account. Full books from $9 a month.
Why the proof matters here
Extra rules change which grids are valid, and a generator that gets them wrong can print a puzzle with two solutions or one that no rule can crack without guessing. Here every puzzle is searched for a second solution under the knight rule, and under the king rule too where it applies. It is thrown away if one exists, and a step-by-step solver must finish it using rules a person can apply.
Books end with a Verification report (on unless you switch it off): each puzzle with its level and size, the number of solutions a complete search found, and, for every type with a step-by-step solver, how it finished the puzzle.
Book ideas: An Anti-Knight Sudoku book for solvers who want a twist on the classic; A progressive book that moves from 6 x 6 to 9 x 9 with the king rule at the end; A Sudoku sampler with ordinary, Killer and Anti-Knight puzzles in one gift book.
How to solve, as printed in the book
Sudoku rules apply: every row, column and box holds each number once (boxes of 2 x 3 on a 6 x 6 grid, 3 x 3 on a 9 x 9 grid).
Two cells a chess knight’s move apart (two cells one way, one cell across) never hold the same number.
Puzzles marked “plus king rule” add one more rule: cells that touch, corners included, never hold the same number.
| Easy | 6 x 6 |
|---|---|
| Medium | 9 x 9 |
| Hard | 9 x 9, plus king rule |
| Challenge | 9 x 9, plus king rule |
Questions
What grid sizes does Anti-Knight Sudoku use?
Easy is 6 x 6, with boxes of 2 x 3. Medium, Hard and Challenge are 9 x 9, with boxes of 3 x 3.
What is the plus king rule?
Hard and Challenge puzzles add one more rule: cells that touch, corners included, never hold the same number. Those puzzles are marked plus king rule on the page. Easy and Medium use the knight rule only.
Does the book explain the knight rule to readers?
Yes. The how-to page states it: two cells a chess knight's move apart never hold the same number. The page is added for every puzzle type in your book.
Other puzzle types
Sudoku · Killer Sudoku · Nonogram · Slitherlink · Kakuro · Bridges · Masyu · Nurikabe · Star Battle · Number Paths · Word Search · E-ink tablet PDFs
See your own pages first
The free sample uses your settings and real puzzles. Check every page before you pay anything.
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