Pencil and Paper Puzzles: Four Kinds and How to Solve Them
Pencil and paper puzzles explained: placement on a board, tours, grid deduction and liar tables, each with a solved example and a first step.
Riddle10 blog
Articles about grid puzzles
How Many Squares Puzzle: Count Squares, Rectangles and Triangles
Count shapes size by size. A step-by-step method for squares, rectangles and triangles, with quick rules, a worked grid and a practice puzzle.
How to Solve Hidden Picture Puzzles: A Step-by-Step Method
Find every hidden shape, letter and object with one method: one item at a time, an anchor feature and a strip sweep. Worked grid and practice puzzle.
Rook and Queen Tour Puzzles: How to Visit Every Square Once
Solve rook and queen tour puzzles: step and slide moves, open and closed tours, the snake plan, forced corner lines and a worked 5 by 5 example.
How Many Latin Squares Are There? Counting Puzzle Grids
Latin squares go from 12 of order 3 to a 37-digit count at order 10. How the counts were found, how larger ones are estimated, and how grid loops are counted.
Equal Sum Square Puzzles: How to Fill Every Row and Column
Fill a square so every row and column adds to the same total. The one-gap rule, the centre rule, a worked four by four puzzle and a practice grid.
Process of Elimination in Puzzles: Rule Out Until One Is Left
How to use the process of elimination in puzzles: list options, cross out what fails, and add a guess-and-check step when you stall. Worked grids.
How to Solve Boat-Placement Puzzles: Find Every Hidden Boat
Use row and column counts and the no-touching rule to find every hidden boat. A clear method, a worked six by six puzzle and a practice grid.
How to Solve Pair-Matching Path Puzzles: Join Every Pair
Join equal numbers with paths that never cross and fill every cell. Learn corner and edge forcing, then try a worked puzzle and a practice grid.
How to Solve Star-Placement Puzzles: Stars That Never Touch
Place stars in every row, column and region so that none touch, even at corners. Five core moves, a worked five by five puzzle and a practice grid.
How to Solve Building Height Puzzles: Count What You Can See
Read edge clues as visible buildings, use the tallest-at-the-edge and cap rules, then follow a worked four by four building height puzzle and a practice grid.
How to Solve Loop Puzzles: The Inside and Outside Method
Draw one closed loop by the numbers. Label cells inside or outside, use zeros, corners and the dot rule, then try a worked and a practice puzzle.
Inequality Number Puzzles: How to Solve Greater-Than Grids
Use each sign to strike out digits, follow chains and valleys, and finish with row and column scans. A full worked grid and a practice puzzle.
How to Solve Latin Square Puzzles: Two Moves and a Worked Grid
Fill each row and column with every symbol once. Learn the only-candidate and only-place moves, a full worked grid and a practice puzzle.
How to Solve Picture Logic Puzzles: Fill-by-Number Grids
Read row and column clues as blocks, use overlap and exact fit, and reveal the hidden picture. A worked five by five puzzle and a practice grid.