GridbinderGridbinder · Masyu
Masyu puzzle book maker for KDP and e-ink
Masyu, the pearl loop puzzle, is for solvers who have already done every Sudoku and want something different. If you publish for them, you need loops that the black and white circles force to a single answer.
Choose the levels, the trim size and the number of puzzles. You get the grids, the how-to page, the answer key and a Verification report in one PDF. The free 12-puzzle sample has a watermark and needs no account.
12 puzzles with your settings, watermarked, no account. Full books from $9 a month.
Why the proof matters here
A Masyu with too few circles has several loops that pass through all of them, and the reader's loop, valid by every rule, does not match the answer key. Gridbinder searches every puzzle for a second loop and discards it if one exists, and a step-by-step solver must finish it using rules a person can apply, so no page needs a guess.
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: A Masyu and Slitherlink book for people who have done every Sudoku; A Masyu book that builds from 6 x 6 to 10 x 10; A loop and path logic book: Masyu, Slitherlink and Number Paths in one gift book.
How to solve, as printed in the book
Draw one loop through the centres of the cells, moving across or down, that passes through every circle. The loop never crosses itself or visits a cell twice.
At a white circle the loop goes straight through and turns in the cell just before or just after it. At a black circle the loop turns and goes straight through both neighbouring cells. Cells without a circle may be left out.
| Easy | 6 x 6 |
|---|---|
| Medium | 7 x 7 |
| Hard | 8 x 8 |
| Challenge | 10 x 10 |
Questions
What grid sizes do the Masyu levels use?
Easy is 6 x 6, Medium 7 x 7, Hard 8 x 8 and Challenge 10 x 10.
How are the rules explained?
The how-to page says: draw one loop through the centres of the cells that passes through every circle. At a white circle the loop goes straight and turns just before or after it. At a black circle it turns and goes straight through both neighbouring cells.
What makes Hard and Challenge harder?
Bigger grids, and Hard and Challenge puzzles may need a one-step what-if check. Easy and Medium use direct deductions only. The Verification report counts the steps.
Other puzzle types
Sudoku · Killer Sudoku · Anti-Knight Sudoku · Nonogram · Slitherlink · Kakuro · Bridges · 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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