Ink FriendlyGuides · Measurements & standards
The measurements behind the paper.
Every generator on this site hands your browser exact geometry. The paper guides cover the rest of the chain: the print setting that decides whether the millimeters survive, the real numbers behind ruled and gridded paper, and how to choose a ruling that matches the work. The game and puzzle guides cover how many bingo cards to print and how to pitch a sudoku, word search, crossword or maze at the right level.
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Printing
How to Print at Actual Size: 100% vs Fit to Printable AreaWhat "Fit to page" does, where the scale setting hides, and the ten-cell ruler test.
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Paper standards
Ruled Paper Sizes: College, Wide, Narrow and Lines Per PageCollege 7.14 mm, wide 8.73 mm, narrow 6.35 mm, lines per page, handwriting rules, and A4 versus Letter.
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Choosing paper
Grid, Dot, or Lined: Choosing Your PageWhich ruling suits which work, what spacing to pick, and what line weight costs in ink.
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Running a game
How Many Bingo Cards Do You Need?One card per player plus spares, how many spares to print, and why two identical cards spoil a round.
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Puzzles
What Makes a Sudoku Puzzle Hard?Why the number of givens tells you almost nothing, what does set difficulty, and why one solution matters.
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Choosing a puzzle
Word Search or Crossword: Which Suits Which Age?One drills recognition, the other tests understanding. Which to pick, and how to size each so it can be finished.
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Puzzles
What Makes a Maze Hard?Why a bigger maze is longer but no harder, plus dead ends, loops, and the tactic that loops exist to defeat.
How these guides are written
The paper guides work from published standards, direct unit conversions and arithmetic you can redo yourself, and each one points at a sheet you can print and measure to check its numbers with a ruler. Where the answer is "that depends on your printer" or "there is no single standard," the guide says so and does not invent a figure. The methodology page covers the geometry the generators use; the paper guides cover everything that happens between that geometry and the paper in your hand.