Easy as LITS by Prasanna Seshadri

LITS by Prasanna Seshadri

PDF

or solve online (using our beta test of Penpa-Edit tools)

Theme: Symmetry and Logic

Author/Opus: This is the 53rd puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Standard LITS rules. Also, the letters outside the grid indicate the first tetromino encountered in the corresponding direction. Or see this:

LITS by Chris Green

(Example by Chris Green, a patron who requested this puzzle style.)

Answer String: Enter the length in cells of each of the shaded segments from left to right for the marked rows, starting at the top. Separate each row’s entry from the next with a comma.

Time Standards (highlight to view): Grandmaster = 2:45, Master = 3:45, Expert = 7:30

Solution: PDF

Note: Follow this link for more variations of LITS and this link for classic LITS. If you are new to this puzzle type, here are our easiest LITS to get started on.

Easy as LITS by Prasanna Seshadri

LITS by Prasanna Seshadri

PDF

or solve online (using our beta test of Penpa-Edit tools)

Theme: Symmetry and Logic

Author/Opus: This is the 52nd puzzle from our contributing puzzlemaster Prasanna Seshadri.

Rules: Standard LITS rules. Also, the letters outside the grid indicate the first tetromino encountered in the corresponding direction. Or see this:

LITS by Chris Green

(Example by Chris Green, a patron who requested this puzzle style.)

Answer String: Enter the length in cells of each of the shaded segments from left to right for the marked rows, starting at the top. Separate each row’s entry from the next with a comma.

Time Standards (highlight to view): Grandmaster = 2:30, Master = 3:30, Expert = 7:00

Solution: PDF

Note: Follow this link for more variations of LITS and this link for classic LITS. If you are new to this puzzle type, here are our easiest LITS to get started on.

2021 Puzzle Grand Prix: US Round Retrospective

Earlier in 2021, Thomas Snyder and Serkan Yürekli from Grandmaster Puzzles constructed a Puzzle Grand Prix round. This week we are taking a look back at those puzzles and will be adding some extra notes on the constructions here.

(more…)

Notes on Penpa-Edit

Penpa Tracker: All puzzles from Jan 2021+ are available in our digital solving tool, as well as the full backlog from 2013 for these genres:
Sudoku: Classic Sudoku, Arrow Sudoku, Thermo-Sudoku, Even/Odd Sudoku, Consecutive Pairs Sudoku, Killer Sudoku, Consecutive Sudoku, Outside Sudoku
Number Placement: TomTom, Kakuro, Japanese Sums
Object Placement: Star Battle, Statue Park
Shading: Tapa, LITS, Nurikabe, Nanro, Kurotto
Region Division: Fillomino, Cave, Pentominous, Araf, Spiral Galaxies, Snake Pit, Kuromasu
Loop/Path: Masyu, Slitherlink, Yajilin, Castle Wall, Balance Loop, Round Trip, Tapa-Like Loop
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Starting in 2021, we have adopted the Penpa-Edit tools for presenting our puzzles in a digital solving format, including automatic solution checking and credit given to the author/original post. We have plans (although they will take some time to complete) to implement Penpa solving modes for all our prior web content; all puzzles Jan 2021+ will have a digital option by default.

Penpa-Edit was originally developed by opt-pan, and we are especially thankful for opt-pan for starting this project. We have taken our version from a branch first started by rjrudman and then further updated by swaroopg92 (Swaroop Guggilam, who has been a guest contributor on the site). We are especially grateful for all their work (and others) to develop this puzzle drafting and solving tool. We thank Swaroop for helpful conversations as we were adopting the tool, including through his PenpaPlus Youtube Channel.

On GMPuzzles, we are calling this a “beta launch” of digital solving as we expect there will be some bugs (that we cause) and also some changes over the next months as we really start to use the tool. There are some aspects in the visual styling and also in the editing of puzzles and solving of puzzles where we expect further updates to the code will improve the experience. For instance, eventually we want to automatically generate the puzzles and solutions from the digital files we receive for submissions which will also make it much faster to convert all our old content to a Penpa-friendly mode. Right now we have to manually make the art so it is possible small errors may occur. Also, there are ways to set solving defaults (e.g., Tab options and initial click states) but in the long list of details to set with every puzzle it may not default to a consistent mode yet. We also want to integrate solving stats more directly into the overall GMPuzzles experience. We will be looking to support further development of the tool, and add back to the open source version of penpa-edit as we do.

If you have your own comments on features/needs as you play through Penpa versions of puzzles here, please feel free to share them with us either on this page or in the comments of the puzzle. We will also be developing more written and visual tutorials, so please tell us when it is not obvious how to solve a puzzle using Penpa-Edit.

Best of 2020: Shading Puzzles

Here are our best Shading puzzles of 2020, in chronological order, selected from the 32 web posts in this category based on FAVE votes, web comments, and tester comments. All of these puzzles are gathered in this PDF file.

A few of our best Shading puzzles were “Skyscrapers” variations with outside clues driving the solve. The first of these comes from guest contributor Freddie Hand: Tapa (Skyscrapers).

Tapa by Freddie Hand

More shading + skyscrapers came soon thereafter from Prasanna Seshadri with this great Kurotto (Skyscrapers) puzzle.

Kurotto by Prasanna Seshadri

Many April Fool’s Days ago I made an audiobook TomTom set of puzzles (that was not just a set of fools) which was followed a few years later by a Cross the Streams (audiobook) by Grant Fikes. Grant revisited this clever idea in 2020 with a new Cross the Streams (audiobook) that was a favorite shading puzzle.

Cross The Streams by Grant Fikes

December brought two great LITS puzzles, starting with this LITS by JinHoo Ahn with an elegant theme (and quite approachable difficulty).

LITS by JinHoo Ahn

Our last best shading puzzle of 2020 is this more challenging LITS by wormsofcan that asked solvers to think outside the box.

LITS by wormsofcan

Solving videos shared with supporters (prior to 2020)

2019/09/13 – Battleships (Minesweeper) (+ puzzle page)
2019/08/31 – Tapa (Easy as) (+ puzzle page)
2019/08/24 – Fillomino (NC) (+ puzzle page)
2019/07/04 – Cave and Kurotto (+ puzzle page 1 / 2)
2019/06/14 – LITS (+ puzzle page)
2019/05/11 – Yajilin (Strict Transparent) (+ puzzle page)
2019/05/10 – Battleships (Minesweeper) (+ puzzle page)
2019/04/20 – TomTom (No Touch) (+ puzzle page)
2019/03/16 – Statue Park (+ puzzle page)
2019/03/15 – Fillomino (+ puzzle page)
2019/02/16 – SSS (Sundoku Snake Shape) (+ puzzle page)
2019/02/15 – Transporter (+ puzzle page)
2019/01/19 – Fillomino (+ puzzle page)
2018/12/14 – Inner Coral (+ puzzle page)
2018/12/12 – Galaxies and Tetrominoes (+ puzzle page)
2018/11/24 – Nurikabe Loop (+ puzzle page)
2018/11/21 – Nurikabe (+ puzzle page)
2018/10/12 – Consecutive Pairs Sudoku (+ puzzle page)
2018/09/08 – Pentopia (+ puzzle page)
2018/08/03 – LITS (+ puzzle page)
2018/07/07 – Kakuro (+ puzzle page)
2018/07/06 – Cave (+ puzzle page)
2018/06/09 – Araf (+ puzzle page)
2018/06/08 – Thermo-Sudoku (+ puzzle page)
2018/05/12 – TomTom (+ puzzle page)
2018/03/16 – Double LITS (+ puzzle page)
2018/02/14 – Consecutive Pairs Sudoku (+ puzzle page)
2018/01/20 – Statue Park (+ puzzle page)
2017/12/27+29 – Minesweeper (+ puzzle page 1 / 2)
2017/12/17 – Cross the Tapa (+ puzzle page)
2017/12/02 – Tapa (Different) (+ puzzle page)
2017/10/07 – Snake Pit X (+ puzzle page)
2017/09/13 – Cross the Streams (LITS) (+ puzzle page)
2017/09/02 – Pentominous (Borders) (+ puzzle page)
2017/08/19 – Killer Sudoku (+ puzzle page)
2017/08/05 – Double Kakuro (+ puzzle page)
2017/07/22 – Tapa (Hex) (+ puzzle page)
2017/06/28-29 – Spiral Galaxies + 2x (+ puzzle page 1 / 2)
2017/06/15 – Nurikabe (Yajisan-Kazusan) (+ puzzle page)
2017/06/01 – Pentosnake (+ puzzle page)
2017/05/12 – Castle Wall (Hex) (+ puzzle page)
2017/04/12+15 – Double Yajilin (+ puzzle page 1 / 2)
2017/03/25 – Starship Battle (+ puzzle page)
2017/03/11 – Tapa (Visionary) (+ puzzle page)
2017/03/04 – Fillomino (Symmetry) (+ puzzle page)
2017/02/10 – Cave (+ puzzle page)
2017/01/27 – Masyu or Balance Loop? (+ puzzle page)
2017/01/13 – Pata (+ puzzle page)
2016/12/10 – Fillomino (Kropki) (+ puzzle page)
2016/11/12 – Statue Park (+ puzzle page)
2016/11/05 – Minesweeper (Even Rows/Columns) (+ puzzle page)
2016/10/23 and 2016/10/21 – Tight Fit Sudoku (Classic and Killer) (+ puzzle page 1 / 2)
2016/10/08 – Roller Coaster (+ puzzle page)
2016/09/30 – Pentominous (Star Battle) (+ puzzle page)
2016/09/17 – Japanese+Latin Sums (+ puzzle page)
2016/09/10 – Fillomino (Symmetry) (+ puzzle page)
2016/08/27 – Castle Wall (+ puzzle page)
2016/08/17 – Gapped Kakuro (+ puzzle page)
2016/08/06 – Slitherlink (Large-Square) (+ puzzle page)
2016/07/29 – Yajilin (+ puzzle page)
2016/07/22 – Canal View (+ puzzle page)
2016/07/09 – Thermo-Sudoku (+ puzzle page)
2016/07/01 – Masyu (Regional) (+ puzzle page)
2016/06/10 – Star Battle (Small Regions) (+ puzzle page)
2016/05/13 – Yajilin (Transparent) (+ puzzle page)
2016/04/28 – Cross the Streams (Windows) (+ puzzle page)
2016/04/16 – Range (+ puzzle page)
2016/04/09 – Killer Sudoku (+ puzzle page)
2016/03/17 – Ripple Effect (+ puzzle page)
2016/03/12 – Slitherlink (+ puzzle page)
2016/02/27 – Arrow Sudoku (+ puzzle page)
2016/02/18 – Kurotto (Windows) (+ puzzle page)
2016/02/13 – Double Kakuro (+ puzzle page)
2015/04/02 – Snake Egg (+ puzzle page)
2015/03/26 – Fillomino (Symmetry) (+ puzzle page)
2015/03/21 – Skyscrapers (+ puzzle page)
2015/03/14 – 2D Top Heavy Number Place (+ puzzle page)
2015/03/05 – Yajilin (+ puzzle page)
2015/02/13 – Balance Loop (+ puzzle page)
2015/02/07 – Kakuro (Hex) (+ puzzle page)
2015/01/31 – Even/Odd Sudoku (+ puzzle page)
2015/01/24 – TomTom (+ puzzle page)
2015/01/16 – Unique Clues Tapa (+ puzzle page)
2015/01/10 – Battleships (+ puzzle page)
2014/12/27 – Pentopia (+ puzzle page)
2014/12/17 – Battleships (+ puzzle page)
2014/12/13 – Cross the Streams (LITS) (+ puzzle page)
2014/12/05 – Cipher Fillomino (+ puzzle page)
2014/11/28 – (Prime) Cave (+ puzzle page)
2014/11/22 – Pentominous (Cipher) (+ puzzle page)
2014/11/15 – Castle Wall (+ puzzle page)
2014/11/08 – LITS (+ puzzle page)
2014/10/31 – Jack-O’-Lantern Thermo Sudoku (+ puzzle page)
2014/10/24 – TomTom (+ puzzle page)
2014/10/17 – RoundTrip (+ puzzle page)
2014/10/04 – Pentomino (+ puzzle page)
2014/09/27 – Tapa (+ puzzle page)
2014/09/18 – Pentominous (+ puzzle page)
2014/09/12 – Sudoku (+ puzzle page)
2014/09/06 – Tapa-Like Loop (+ puzzle page)
2014/08/28 – Pentominous (+ puzzle page)
2014/08/23 – Killer Sudoku (+ puzzle page)
2014/08/15 – Kuromasu (+ puzzle page)
2014/08/08 – Sum Skyscrapers (+ puzzle page)
2014/08/02 – Repeated Neighbors Sudoku (+ puzzle page)
2014/07/24 – Nanro (+ puzzle page)
2014/07/12 – Nurikabe (+ puzzle page)
2014/07/04 and 2014/07/06 – Star Battle (+ puzzle page 1 + email only = no puzzle page)
2014/06/24 and 2014/06/27 – Cross the Streams (B&W Partially Inverted and Pentominoes) (+ puzzle page 1 / 2)
2014/06/19 and 2014/06/21 – Word Nurikabe and Cipher TomTom from IPC (+ puzzle page 1 / 2)
2014/06/13 – Transparent Tapa (+ puzzle page)
2014/05/31 – Slitherlink (Portal) (+ puzzle page)
2014/05/22 – LITS (+ puzzle page)
2014/05/08-09 – Araf (+ puzzle page 1 / 2)
2014/05/03 – Heavy Dots (+ puzzle page)
2014/04/19 – Ripple Effect (+ puzzle page)
2014/04/12 – Checkered Fillomino (+ puzzle page)
2014/04/05 – Audio Cross the Streams (+ puzzle page)
2014/03/28 – Outside Nurikabe (+ puzzle page)
2014/03/21 – Sudoku (+ puzzle page)
2014/03/07 – Slitherlink (Sheep and Wolves) (+ puzzle page)
2014/02/27 – Cave (+ puzzle page)
2014/02/14 – Fillomino (+ puzzle page)

All Books (by release date)

Here are all of our book collections in publication order, all available for purchase at our e-store!

50. Grandmaster Puzzles Quarterly: Volume 4, edited by Serkan Yürekli (June, 2022)
49. Tapa and Variations 3 by Zoltán Horváth and Serkan Yürekli (May, 2022)
48. Grandmaster Puzzles Quarterly: Volume 3, edited by Serkan Yürekli (April, 2022)
47. Starter Pack 2: Tapa by Serkan Yürekli (April, 2022)
46. Masterpiece Sudoku Mix 6: Consecutive Pairs Sudoku, edited by Serkan Yürekli (February, 2022)
45. Masterpiece Sudoku Mix 5: Tight Fit Sudoku, edited by Serkan Yürekli (February, 2022)
44. Starter Pack 1: Fillomino by Grant Fikes (February, 2022)
43. Shading Variety Collection by Prasanna Seshadri (January, 2022)
42. Grandmaster Puzzles Quarterly: Volume 2, edited by Thomas Snyder and Serkan Yürekli (December, 2021)
41. Masterpiece Sudoku Mix 4: Outside Sudoku, edited by Serkan Yürekli (November, 2021)
40. Masterpiece Sudoku Mix 3: Arrow Sudoku, edited by Serkan Yürekli (November, 2021)
39. Star Battle 2, by JinHoo Ahn and Murat Can Tonta (November, 2021)
38. Grandmaster Puzzles Quarterly: Volume 1, edited by Thomas Snyder (September, 2021)
37. Masterpiece Sudoku Mix 2: Thermo-Sudoku, edited by Serkan Yürekli (August, 2021)
36. Masterpiece Sudoku Mix 1: Even/Odd Sudoku, edited by Serkan Yürekli (August, 2021)
35. TomTom, by Ashish Kumar, JinHoo Ahn, Murat Can Tonta, and Serkan Yürekli (July, 2021)
34. Loop Variety Collection, by Ashish Kumar and Murat Can Tonta (April, 2021)
33. The Art of Sudoku 2, edited by Thomas Snyder (March, 2021)
32. Balance Loop by Prasanna Seshadri and Murat Can Tonta (February, 2021)
31. Araf by Serkan Yürekli (January, 2021)
30. Star Battle by JinHoo Ahn (December, 2020)
29. Killer Sudoku by Serkan Yürekli (December, 2020)
28. Kurotto by Prasanna Seshadri (November, 2020)
27. Plenty o’ Pentominous 3 by Grant Fikes and Murat Can Tonta (November, 2020)
26. Yajilin Battleships by Serkan Yürekli (November, 2020)
25. Tapa and Variations 2 by Serkan Yürekli (May, 2020)
24. Plenty o’ Pentominous 2 by Grant Fikes and Murat Can Tonta (February, 2020)
23. Yajilin by Murat Can Tonta and Prasanna Seshadri (November, 2019)
22. The Puzzlemasters’ Workshop, edited by Thomas Snyder (June, 2019)
21. Skyscrapers by Ashish Kumar (March, 2019)
20. Nurikabe by Ashish Kumar (November, 2018)
19. Castle Wall by Serkan Yürekli (October, 2018)
18. Intro to GMPuzzles by Serkan Yürekli (August, 2018)
17. Statue Park by Murat Can Tonta (July, 2018)
16. Fill o’ Fillomino 2 by Grant Fikes (June, 2018)
15. A Number o’ Nanro by Prasanna Seshadri (May, 2018)
14. The Art of Puzzles 2: Double Trouble, edited by Thomas Snyder (April, 2018)
13. Plenty o’ Pentominous by Grant Fikes and Murat Can Tonta (March, 2018)
12. Battleships and Variations by Serkan Yürekli (July, 2017)
11. Slitherlink and Variations by Serkan Yürekli (April, 2017)
10. Colossal Cave Collection by Roger Barkan (January, 2017)
9. Logic Puzzles 101 by Grant Fikes (December, 2016)
8. Snake and Variations by Serkan Yürekli (December, 2016)
7. Kakuro and Variations by Serkan Yürekli (September, 2016)
6. Tapa and Variations by Serkan Yürekli (July, 2016)
5. Tapa-Like Loop Collection by Prasanna Seshadri (March, 2015)
4. Fill o’ Fillomino by Grant Fikes (November, 2014)
3. LOTS O’ LITS by Grant Fikes and Prasanna Seshadri (July, 2014)
2. The Art of Puzzles, edited by Thomas Snyder (June, 2014)
1. The Art of Sudoku by Thomas Snyder (April, 2012)