Ink FriendlyGuides · Measurements & standards
The measurements behind the paper.
Every generator on this site hands your browser exact geometry. These 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. Written to be checked against a ruler, not just read.
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Printing
How to Print at Actual Size (and Why It Fails)What "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, and MetricCollege 7.14 mm, wide 8.73 mm, narrow 6.35 mm, 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 per player is the floor. What to print beyond that, and why two identical cards spoil a round.
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Puzzles
What Makes a Sudoku Puzzle Hard?Counting the givens tells you almost nothing. What sets 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?Bigger is longer, not harder. Dead ends, loops, and the tactic that loops exist to defeat.
How these guides are written
Every number in these pages is either a published standard, a direct unit conversion, or arithmetic you can redo yourself — and each guide points at a sheet you can print and measure to confirm it. Where the honest answer is "that depends on your printer" or "there is no single standard," the guide says so rather than inventing a figure. The methodology page covers the geometry the generators use; these guides cover everything that happens between that geometry and the paper in your hand.