Number Lock Deduction Puzzles

Use without printing: Keep the puzzle and clues open on screen and record candidate answers, eliminations and your final answer in a notes app or spreadsheet. Use a separate entry for each puzzle number. Check the hints only when needed and compare your reasoning with the included solutions. No built-in form fields or automatic scoring are supplied.

Thirty original four-digit code puzzles across three levels. Use exact-position and wrong-position match counts to deduce each unique code. Includes precise rules, a fully worked example, two-stage hints, and solutions with complete final-candidate elimination plus verification against every clue. One 24-page, US Letter static printable PDF. Pencil and optional eraser required; no physical item or editable file is included.

Print on U.S. Letter at Actual Size / 100%. Static PDF, not a fillable form. No physical item, editable source files or supplies are included.

Created by Joshua D. Hamburger for Carnal Magic LLC. Preview watermarks are not present in the purchased PDF. Personal or single-household use only. No resale or redistribution.