Visibility: ON
Draw on Edges: ON Panel: OFF

COORDINATE ARROWS
– Digits on an arrow spell out the coordinates for the digit that is their sum
– The row number is written on the start of the arrow, the column number is written on the arrow tip (if for example an arrow looks like this: -1 4-> then there must be a 5 in r1c4)
– All the arrows must correspond to different coordinates
– Digits may repeat on an arrow if allowed by other rules

SKYSCRAPERS (row 0 and column 0)
– Imagine the digits in the grid as skyscrapers with heights corresponding to their values. Numbers outside the grid show how many digits that can be seen in the corresponding row/column. Taller buildings hide shorter buildings
– None of the actual numbers, if any, are given; they would need to be deduced by the solver
– For the purpose of skyscraper counting, the digit 0 is null (does not count as a skyscraper)

DOPPELGANGER
– Every row, column, and box contains the digit 0 always, as well as eight out of the nine digits from 1 to 9 (ie, it's missing one digit that is not 0)
– No two row, no two column, and no two box may be missing the same digit
– For each 0 in the grid, the digits missing in its row, its column, and its box must be three different digits
– A zero always acts as itself (ie, the lowest possible value), regardless of what digits it's replacing in its box, row and column

INEQUALITY
– The inequality symbol points to the smaller digit of the domino it covers

Atlantis Kafkapharnaum

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Mode: Box

Image URL:

X position:
Y position:
Width:
Height:
Opacity:
Draw in foreground:
Mask out white from image:
White mask threshold:

Ignore Pencil Marks (L, M, S values)

Ignore Whitespace for Import

Skip Import Non-Square Check

Error: it contains non-alpha-numeric characters

App Display
Display Theme:
Display Layout:

Timer:
Puzzle Display
Sudoku Pencil Marks:
Sudoku Normal:
Outline on Text:
Star Battle Dots:
Surface Second Color:
Tools
Custom Colors:
Floating Panel:
Quick Panel Button:
Export
Auto-Shorten Links:
Input Options
Mouse Middle Button:
Reload Protection:
Conflict Detection:
Check pencil marks:

Any color can match green line/edge in solution:
Sudoku Z/Y & XCV Keys:
Saving/Storage
Saved Settings:
Auto-save puzzle in browser history:
Local Storage:	Your browser has disabled or doesn't support local storage.

Ctrl + z: Undo
Ctrl + y: Redo
Ctrl + d: Clone
Ctrl + i: To copy the previous number/alphabet/symbol from Number mode with PANEL: ON
Ctrl + Space: Delete numbers and symbols at the same time
Shift + Space: Enter a space (Works in "Number" Mode => "L", "M", "S" and Long" SubMode options only)
Ctrl + a: Select all cells
Alt + drag: For rectangular selection
F2: Problem mode
F3: Solution mode
F4: Hide/Show Timer
Tab or Enter: Cycle Input Tools
ESC: To clear selection or exit open dialogues
?: Show keyboard shortcuts

Use number keys 0 - 9 to fill colors in the selected cells. switch between styles. For styles 11 and 12, press ALT+1 or ALT+2 respectively.

z: Normal Submode*
x: Corner Submode*
c: Centre Submode*
v: Shading*
Shift: For Temporary Corner Submode
Shift + Delete: Deletes only corner pencil marks from the selected cells
Ctrl - For Temporary Centre Submode / Selecting Multiple Cells/ Deselecting selected cells
Ctrl + Delete: Deletes only centre pencil marks from the selected cells
Delete: To delete all the contents of the cell
Space: To delete only the selected submode contents. (E.g. If the cell contains both centre and corner pencil marks, and if the current submode selection is "Corner submode", the pressing Spacebar would delete only the corner pencil marks)
Double click: Double clicking the number in a cell will select all instances of that number. (applies to number mode as well)

Use number keys 0 - 9 to quickly switch between styles. For styles 11 and 12, press 1 and the second digit in quick succession.

It's a web application and universal pencil puzzle editor capable of drawing many different kinds of pencil puzzles. You can download your puzzles as images and save puzzle links in the form of URLs to share with others.

Shortcuts Tool Instructions Youtube Tutorials List of Youtube Tutorials Steps to Create a Sudoku/Puzzle Frequently Asked Questions Discord Channel Bookmarklet to Open Puzz.Link / PZV / pzprxs / OtherPenpaFork Puzzles in Penpa+

Provide Feedback Contribute to Project Ongoing TO-DO list Changelogs Credits License

Note: This is by no means an exhaustive list. Penpa+ is not affiliated with these sources. Please contact respective owners for any further information.

Eric Fox - Dictionary of Rulesets Ryotaro Chiba - WPC Puzzles LMI - WSC IB (Sudoku Variants) Puzzle Duel Club Ropeko - Logic Puzzles List

Surface - Match exact colors:
Shading - DG (Dark Grey), GR, LG, BL (Black):
Number - Normal, L, M, S - Green, Blue, Red Sudoku - Normal, Centre - Green, Blue, Red:
Line - Match exact styles:
Line - Green, Double only:
Line - Ignore Given Line Segments:
Line - Match exact styles:
Line - Green, Double:
Edge - Match exact styles:
Edge - Green, Double:
Edge - Ignore Edges on Grid Border / Givens:
Edge - Match exact styles:
Edge - Green, Double:
Wall - Green:
Shape - Shape - Square - Option 2:
Shape - Shape - Circle - M size - Options 1 & 2:
Shape - Shape - Corner triangle - Options 1 to 4:
Shape - Arrow - Small - Options 1 to 8:
Shape - Number - Math - Black, Green - Options 2 & 3:
Shape - Special 1 - Battleship - Black - Options 1 to 6 and Curvy Black - Options 1 to 4:
Shape - Special 1 - Tent - Option 2:
Shape - Special 1 - Star - Options 1 to 3:
Shape - Special 2 - Lightbulb - Option 3:
Shape - Special 2 - Minesweeper - Option 4:

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Mode: Box

New Grid

Board type:

Size:

White space:

*Update display* button only affects the following properties:

Display size:

Gridlines:

Gridpoints:

Outside frame:

Resize

Add/Remove Rows/Columns:

Set Background Image

Save screenshot

White border:

Image quality:

File Type:

Title & Author:

Rules:

Rotate / Move / Add / Remove

Rotate:

Flip:

Move:

Add/Remove Rows/Columns:

Share Puzzle

Puzzle Information

Generate URL

Add/Remove Genre Tags

Extended Output

Solution will check for the following:

Custom Message

Header

Share Replay

Input/Output Sudoku String

Load URL

General Settings

Keyboard Shortcuts

In Multicolor Mode

In Sudoku Mode

In Surface Mode

Welcome to Penpa+

Usage

Development

Sudoku/Puzzle Rulesets

Update display button only affects the following properties: