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Missing Deck puzzles

Missing Deck puzzlesMissing Deck puzzlesMissing Deck puzzles
  • Home
  • Points of Pride
    • Video Features
    • Showcase Puzzles
    • Comments on Our Puzzles
    • Ducklings
    • Duckling Features
  • By Difficulty
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    • GAS Collection 1
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    • Indigestion Collection 2
    • Heartburn Collection
  • Complete Archive
    • November 2022
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June 2022

Why the Caged Bird Whispers

A collection of constraints with interesting interactions. We started this puzzle and set it aside for a while, finally adding an extra clue to make it more fun. This puzzle also appears in the Heartburn Collection.


Estimated difficulty: 3.5/5


Rules

Normal sudoku rules apply. Each row, column, and box must contain a complete set of the digits 1-9.


Normal killer cage rules apply: digits in cages cannot repeat and must sum to the number shown in the upper left corner of the cage.


Digits along a thermometer must strictly increase from bulb to top but do not have to be consecutive.


Green lines are German whispers lines. Adjacent digits along the line must differ by 5 or more. 


Purple lines are Renban lines. Digits along a renban line form a set of consecutive digits in any order.


Solve in the SudokuPad add with solution check

Modular X-Sums

A precursor to Residual X-Rays, this puzzle was our first set using hidden modular lines. It also appears in the Heartburn Collection.


Estimated difficulty: 3/5


Rules

Normal sudoku rules apply. Each row, column, and box must contain a complete set of the digits 1-9.


X-Sums: Digits outside the grid give the total of the first X digits in row or column, where X is the first digit along that row or column, starting with value outside the grid.


Every X-sum forms a hidden modular line of length X.


Modular lines: Every set of three sequential digits along a modular line must contain a complete set of residues modulo 3, i.e. one digit from {1,4,7}, one from {2,5,8}, and one from {3,6,9}.


Solve in the CtC App

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