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Theme: 400 Posts

Author/Opus: This is the 400th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard TomTom rules, except the digit set is unknown. This puzzle uses 8 distinct non−negative integers.

Difficulty: 5 stars

Time Standards (highlight to view): Grandmaster = 10:30, Master = 20:30, Expert = 41:00

Solution: PDF; a solution video is also available here. A video telling the story of how this puzzle was constructed by Thomas is here.

Note: Follow this link for classic TomTom and this link for TomTom variations. If you are new to this puzzle type, here are our easiest TomTom to get started on. More TomTom puzzles can be found in the TomTom collection, in The Art of Puzzles, and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

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Author/Opus: This is the 358th puzzle from our managing editor Serkan Yürekli.

Rules: Standard Skyscrapers rules; also standard TomTom rules. Use the integers 1-6.

Difficulty: 3 stars

Time Standards (highlight to view): Grandmaster = 3:45, Master = 6:00, Expert = 12:00

Solution: PDF; a solution video is also available here.

Note: Follow this link for classic Skyscrapers puzzles and this link for variations on Skyscrapers puzzles. Follow this link for classic TomTom and this link for TomTom variations.

See more discussion of the puzzles from the United States’ 2021 Puzzle Grand Prix on this post. Note there are some construction details and potential spoilers on that post so view it after you solve.

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Author/Opus: This is the 407th puzzle from Thomas Snyder, aka Dr. Sudoku.

Rules: Standard Skyscrapers rules; also standard TomTom rules. Use the integers 1-7.

Difficulty: 3 stars (estimate based off competition points; timing standards not available from our usual testers)

Solution: PDF

Note: Follow this link for classic Skyscrapers puzzles and this link for variations on Skyscrapers puzzles. Follow this link for classic TomTom and this link for TomTom variations.

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Theme: Signed by the Author

Author/Opus: This is the 352nd puzzle from our contributing puzzlemaster Grant Fikes.

Rules: Standard TomTom rules, using the integers 1-5. The two grids have the same numerical clues in the cages with the given operations (e.g. the sum of the upper-left cage in the top grid equals the product of the upper-left cage in the bottom grid). The value of all mathematical operations must be nonnegative integers.

Difficulty: 3 stars

Time Standards (highlight to view): Grandmaster = 3:45, Master = 4:45, Expert = 9:30

Solution: PDF; a solution video is also available here.

Note: Follow this link for classic TomTom and this link for TomTom variations. If you are new to this puzzle type, here are our easiest TomTom to get started on. More TomTom puzzles can be found in the TomTom collection, in The Art of Puzzles, and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

This year, we have started to have some extra difficult Sunday Stumpers, about once a month. These will be quite tough puzzles, but with a logical path to be found (and solution videos to help). This fifth Sunday Stumper is a TomTom puzzle with encoded cage clues.

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Theme: Father’s Day

Author/Opus: This is the 320th puzzle from our managing editor Serkan Yürekli.

Rules: Standard TomTom rules, using the integers 1-9. Also, the letters F, A, T, H, E, R, S, D, Y represent different digits from 0-9. Identify which letters stand for which digits and then solve the TomTom. Multi-digit clues cannot start with a 0. (Note: The /S cage is a division cage with value “S”; the slash sign is used instead of the normal division symbol for aesthetic purposes.)

Difficulty: 5 stars

Time Standards (highlight to view): Grandmaster = 50:00, Master = 1:15:00, Expert = 2:30:00

Solution: PDF; a solution video is also available here.

Note: Follow this link for classic TomTom and this link for TomTom variations. If you are new to this puzzle type, here are our easiest TomTom to get started on. More TomTom puzzles can be found in the TomTom collection, in The Art of Puzzles, and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

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Theme: One-Two Punch

Author/Opus: This is the 16th puzzle from guest contributor Dan Katz.

Rules: Standard TomTom rules, using the integers 1-6. Additionally, no clue numbers are given for the cages, but clue numbers are given for adjacent pairs of cages. For each clue number, it must be possible to apply one operation to the digits in the first cage, a different operation to the digits in the second cage, and a third operation (different from the first two) to the two cage results to obtain the given clue number.

See also this example:

Difficulty: 4.5 stars

Time Standards (highlight to view): Grandmaster = 6:15, Master = 17:30, Expert = 35:00

Solution: PDF; a solution video is also available here.

Note: Follow this link for classic TomTom and this link for TomTom variations. If you are new to this puzzle type, here are our easiest TomTom to get started on. More TomTom puzzles can be found in the TomTom collection, in The Art of Puzzles, and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

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Theme: Tetromino Z

Author/Opus: This is the 318th puzzle from our managing editor Serkan Yürekli.

Rules: Standard TomTom rules, using the integers 1-6. Also, standard Skyscrapers rules.

Difficulty: 4 stars

Time Standards (highlight to view): Grandmaster = 6:00, Master = 10:15, Expert = 20:30

Solution: PDF; a solution video is also available here.

Note: Follow this link for classic TomTom and this link for TomTom variations. Follow this link for classic Skyscrapers puzzles and this link for variations on Skyscrapers puzzles. More TomTom puzzles can be found in the TomTom collection, in The Art of Puzzles, and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

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Theme: Nuns See Sense!

Author/Opus: This is the 68th puzzle from our contributing puzzlemaster John Bulten.

Rules: Standard TomTom rules, using the integers 1-6. Also, the letters E, N, S, U represent different digits from 0-9. Identify which letters stand for which digits and then solve the TomTom. Multi-digit clues cannot start with a 0.

Difficulty: 3 stars

Time Standards (highlight to view): Grandmaster = 3:15, Master = 5:45, Expert = 11:30

Solution: PDF

Note: Follow this link for classic TomTom and this link for TomTom variations. If you are new to this puzzle type, here are our easiest TomTom to get started on. More TomTom puzzles can be found in The Art of Puzzles, and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

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Theme: Clue Symmetry and Logic

Author/Opus: This is the 255th puzzle from our contributing puzzlemaster Serkan Yürekli.

Rules: Standard TomTom rules, using the integers 1-8. Also, identical digits cannot be in diagonally adjacent cells

Answer String: Enter the 2nd row from left to right followed by the 6th row from left to right. Separate the entries with a comma.

Time Standards (highlight to view): Grandmaster = 10:00, Master = 15:00, Expert = 30:00

Solution: PDF; a solution video is also available here.

Note: Follow this link for other TomTom. If you are new to this puzzle type, here are our easiest TomTom to get started on. More TomTom puzzles can be found in The Art of Puzzles, and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

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Theme: Even

Author/Opus: This is the 15th puzzle from guest contributor Dan Katz.

Rules: Standard TomTom rules, using the indicated set of integers {0,2,4,6,8}.

Answer String: Enter the 1st row from left to right followed by the 4th row from left to right. Separate the entries with a comma.

Time Standards (highlight to view): Grandmaster = 1:00, Master = 1:30, Expert = 3:00

Solution: PDF

Note: Follow this link for other TomTom. If you are new to this puzzle type, here are our easiest TomTom to get started on. More TomTom puzzles can be found in The Art of Puzzles, and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.