Mirror Puzzles Dungeon map Calcudoku Fences Heyawake へやわけ Piece Place ピースプレース Endorain エンドライン Yajikabe ヤジかべ Tetoron テトロン Regional Tapa Megane メガネ Jisoku 自測 Shiro Ten Spur Loop Loop and Bounds Floor Plan Regional Snake Elastic Loop Kurodoko Loop Straight Cross ストレートクロス Speckled Bands Tumbleweed Loop Golem Grad Slide & Seek Greener Grasses Regional Star Battle Regional LITS Sample Paint サンプルペイント Uso-nori うそのり Show Ten Nuri Ten ぬりてん Geradeweg Tetroid テトロイド Math Path Kakeeru カケエル Water fun アクアプレース Aquarium アクアプレース Eisbahn アイスバーン Ice Walk アイスウォーク Regional Walk Polyomino packing Letter Weights Accord Loop Ranker Interlaced Triplets Kropki Pairs Seiza 星座になれたら Bar Graph Landvermessung Gokigen Naname Regilin ヘヤジリン Double or nothing ダブルブロック U-bahn Haunted Mirror Mazes Vista Aquapelago Corridors Diagonal Dissection Regional akari 美术馆（区域) Milk Tea ミルクティー Polyominous Internal Patrol Nikakoku ニカコク Border Patrol Tentaisho 天体ショ Putteria Aqre Nuritwin ぬりツイン Binary Runs Stained Glass ステンドグラス Sunglasses Norinori のりのり Disconnection ディスコネクション Point Plate 点プレート Inbox/Outbox インボックス・アウトボックス Creek クリーク Spokes Loop 12 12号ループ Parking パーキング Shrooms Grandstands Barns バーンズ Light and Shadow 白かべ黒かべ Tetroscope Retoponogo Sniping Arrow スナイピングアロー Yosumi 四隅に切れ ABC's Cross Math Tamago Town Yakisoba Turn Sums Pipelink ハイプリンク Forceloop Tally Loop Crossroads Koburin コブリン Number Crosslink Kazuburo カズブロ Linesweeper 八方リンク Honey Dozen NIKOJI Squares and Rectangles White Link Jadium Firewall Multiplication Link 掛け算リンク Naname Loop ななめでご輪す Gemini Loop Nombre ノンブル Gemini Block Kindomino カインドミノ Kurohappo クロハッポー Cave バッグ Kurohori クロホリ Tasquare たすくえあ Norino-LITS LOTS Heterocut Kurodoko 黒どこ Kurotto クロット Pointing at the Crowd Choco Banana チョコバナナ Rectyard LITS Akari 美術館 Hitori ひとり Slitherlink スリザーリンク Bramble Fillomino フィルオミノ Yin-Yang しろまるくろまる Inturnal Implicit Directors Araf 相ダ部屋 Nurikabe ぬりかべ One-Two Zone ワンツーゾーン Lighthouses Parimony Touching Tails Yajilin ヤジリン The Convoy the Longest 短辺消失 SLICY Anymino Sudoku 数独 LUZ Loop Estate Lawns Isowatari 磯渡り Ripple Loop Suguru ナンバーブロック Hidoku Foreshadow Nurisquare Knight Loop Cross Border Parity Loop Vertigo Tring-tring Corner Loop コーナーループ Ore-dango おれだんご Hasu no Mura はすのむら Akari (RGB) 美術館のカラ Alcazar Redemption Flexible Counters Dance and Dance ダンス.アンド.ダンス Nurikabe Loop 面積リンク Reachability Curve Sums Ornamented Tree Achtelwenden Zero One Lines ゼロイチライン Trizone サントイッチ Masyu ましゅ Tetritory テトリトリー Starry Knights Knight's Tour (closed) ナイトリンク Turtle Shell Loop 亀甲の輪 Loom Crosswall クロスウォール RGB Loop ループ Loop Hit Points ヒットポイント X-Sums Bouba & Kiki Loop RB Loop R・B ループ Gravel Chess Loop Numericlone Chess Avoidance Zukei Puzzles Shikaku Cut Magic Shape Nuri Nearest Number Simple Loop Soulmates Tricklayer Bricklayer Parrot Loop Brownies Clones コローン Shirokuro Pipe シロクロパイ Decoration Tree Tiger in the Woods Pearl Necklace パールネックレス Path Puzzles Ivy Crossing Flashlights Flashlights Sneaky Snakes Limbs Nura-knight 塗らナイト Ice Dance Pair アイスダンス・ペア Honey Circuit Black holes ブラックホール Myopia Contact Chess Num Tectonic Squares Chess Position Ionic Squares Ant Mill Xerophile Half Suits Skating Dream Sequence Shapeshifting Chess Battle Catch 22 Tic Tac Toe Puzzles Chess Pack Barbed Wire Arrow Loop Hex Loop Hex Turn Pentomino Puzzles Tetro Stack Venn ベンズループ Rosewary Rook End Mazes Cross Roads Perplexing Path Full House Untangram Unrectangles Square Jam Hiking Track Plot Twist Diamond Puzzles Divide and Conquer Shape Grid Different Rectangles Room Puzzles Tet & Pent Color Puzzles Corner Meeting Gerrymandering Five and Dime Corner Packing Vegetable Garden Scattered Lohkous Boomerangs The Great Divide Crowded Intersections Chainlink Hamiltonian Mazes Rectangle Puzzles Connect the Dots Puzzles Timber! Dot Triangle Puzzles Try Angles House Puzzles Non-crossing Puzzles Zig Zag Mountain Climber Unparalleled Tricky Tour Hamiltonian Plumbers OX Loop OX ループ Chess Path Legalese Oddstitch Pathfinder Unequaloop Straight Mazes Corner Mazes Loop Count Field Trespass Knight Tour One Good Turn Deserves Another Color Mazes Unequal Length Mazes Palindrome Path One of Each Following Suit アンイーブン Jump Rope 2-3 Mazes Line Segment That's Not Right Slow Turn Roost Subwhirl Tumbleweed Subway Bonsai Gardening Kudamono

Crowded Intersections

Updated on (created ) — Filed under: Erich Friedman List Paper Ported Puzzle polyomino territory
Divide the map into regions of area 4 such that at every dot three regions meet, and nowhere else. 4-way intersections are never allowed.

Based on ruleset by Erich Friedman

First seen (2013) at Puzzle Palace

This is an example puzzle - tap to interact!

Divide the board into regions containing exactly 4 tiles.

At every circle, exactly three regions must meet.

Except at a circle, no more than two regions meet.

Solved!
Rule panels by Pedro on 21/12/2023

Erich Friedman composed the ruleset and first puzzles of Crowded Intersections (2013), shared at Puzzle Palace, , alongside many other original paper puzzles. Crowded Intersections is related to Point Plate 点プレート.

In 2021 Pedro released the Crowded Intersections interactive app, leveraging the Kudamono Editor system. Pedro derived the programming logic, decided on colours & input modes and created all graphic assets, by tracing SVG paths. Rule panels by Pedro on 21/12/2023.

All puzzles listed on this page have a single, unique solution. Brand-new puzzles are proudly submitted by their authors regularly, while historic puzzles gain a new life in the interactive Kudamono format: here transcribed for the first time, with permission from each author, on a unit-, genre- or general basis.

[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
[ Rendering... ]
 loading... puzzle21 loading... puzzle22 loading... puzzle23

Start with a blank page (new Crowded Intersections puzzle).

Detailed editing instructions and shortcuts can be found at the manual.

The following custom insertion shortcuts apply to Crowded Intersections:

Keyboard shortcuts for Crowded Intersections (S = solving, E = editing, S/E = both solving and editing )
Glyph When Submode Shortcut Description
www.w3.org/2000/svg'> S—-A → Uauto mode: auto-choose submode based on gesture type and location
www.w3.org/2000/svg'> SlineL → Iedge line (solve): drag or click to draw definitive edge line (solve)
www.w3.org/2000/svg'> EsymbolXAbsent tile: click or drag to place definitive symbol Absent tile
www.w3.org/2000/svg'> EsymbolC → RCircle: click or drag to place definitive symbol Circle
www.w3.org/2000/svg'> S/Eaux lineS → Ksketch line (edge): drag or click to sketch auxiliary line
www.w3.org/2000/svg'> S/Eaux lineDcontiguous tile marks: Click or drag to add contiguous aux lines

Pressing an exclusive editing shortcut while solving, or vice-versa, causes a switch into that context. In contrast, shared shortcuts cause no switch, but are instead chosen to match the current context.

To copy the right url, simply follow the button sequence (export) → (link).

Likewise, a puzzle image may be exported via (export) → (picture).

Made a puzzle that you'd like to list here at Pedro's Works? Simply follow the Submission Guide!

When sharing a Crowded Intersections link on other social networks or across the fediverse please also include the hastag #KudamonoEditor in the post. Including the puzzle picture will usually enhance your post.

This table lists external sites and databases referencing Crowded Intersections.

Interlinks - other sites and databases listing this puzzle genre
Site Link Comment
PuzzleSquareJPCrowded Intersectionsyou may also share your Crowded Intersections puzzles at PuzzleSquareJP: please include the hashtag #KudamonoEditor in the puzzle description

Please with any issues and suggestions.

There are specific instructions for live conflict highlighting and input issues, for improving the rule panels or reporting non-uniquenesses.

For any other bugs, please:

  • describe what you were trying to do,
  • what happened instead, and
  • send the current url (plus any visible error logs and possibly, supplementary screenshots).

You may check whether your bug is already covered by the unit tests (it may take a few seconds before the page loads fully). Any yellow boxes indicate a failed test. "Performance issues" currently indicate all passed tests, slow or not.

If you find a situation where the live conflict highlighter is not working as you'd expect (e.g. too aggressive, incorrect), please send a small test case url plus a brief explanation of what should be happening instead.

A good test case includes the smallest possible board, with the fewest possible elements, that is still able to unambiguously reproduce the issue.

For interface issues related input modes, or more generally to clicking/touching/dragging, keyboard shortcuts, etc… please submit an input test case, as detailed in the Inputs Initiative.

For simple typos/rewordings, a short email suffices. For more substantial changes, please refer to the rule panels guidelines.

If you find a non-uniqueness in one of the puzzles, please first check whether you are able to contact the puzzle author directly to request a fix.

If that seems impractical, please submit either:

  • a corrected, unique puzzle url (with solution), if you are able to suggest a fix (preferred); or
  • a puzzle url solved up to the point where the puzzle stops being unique; or
  • multiple urls (one per solution)
2023-12-21 Added a divisibility checker and updated the highlighter to correctly prevent three regions near absent tiles; rephrased the rules with special attention to this behaviour. A suggestion by PinkHoodie, who also sent a puzzle! 2024-01-11 Corrected a recent regression found by Yu Ho 2024-05-24 PinkHoodie included this genre in a puzzle series themed after the 26 letters of the alphabet! 2025-01-09 Clarified the ruleset as pointed out by PinkHoodie, and corrected a link on this page 2025-01-12 puzzletters PinkHoodie crafted 1 Crowded Intersections (classic) puzzle - danke!