The
Calendar
hole will go live in approximately
12 days
. Why not try and solve it ahead of time?
Recent Solutions
Achievements
Cheevos
Golfers
Solutions
All Holes
12 Days of Christmas
24 Game
99 Bottles of Beer
Abundant Numbers
Abundant Numbers (Long)
Arabic to Roman
Arithmetic Numbers
Arrows
Ascending Primes
ASCII Table
Billiards
brainfuck
Card Number Validation
Catalan Numbers
Catalan’s Constant
Christmas Trees
Collatz
CSS Colors
Cubes
Day of Week
DFA Simulator
Diamonds
Divisors
Emirp Numbers
Emirp Numbers (Long)
Emojify
Evil Numbers
Evil Numbers (Long)
Factorial Factorisation
Farey Sequence
Fibonacci
Fizz Buzz
Foo Fizz Buzz Bar
Forsyth–Edwards Notation
Fractions
Game of Life
Gijswijt’s Sequence
Happy Numbers
Happy Numbers (Long)
Hexdump
Hilbert Curve
Intersection
Inventory Sequence
ISBN
Jacobi Symbol
Kaprekar Numbers
Kolakoski Constant
Kolakoski Sequence
Leap Years
Levenshtein Distance
Leyland Numbers
ln 2
Look and Say
Lucky Numbers
Lucky Tickets
Mahjong
Mandelbrot
Maze
Medal Tally
Minesweeper
Morse Decoder
Morse Encoder
Musical Chords
N Queens
Niven Numbers
Niven Numbers (Long)
Number Spiral
Odious Numbers
Odious Numbers (Long)
Ordinal Numbers
PalindromemordnilaP
Pangram Grep
Partition Numbers
Pascal’s Triangle
Pernicious Numbers
Pernicious Numbers (Long)
Poker
Polyominoes
Prime Numbers
Prime Numbers (Long)
Proximity Grid
QR Decoder
Quine
Recamán
Repeating Decimals
Reverse Polish Notation
Reversi
Rijndael S-box
Rock-paper-scissors-Spock-lizard
Roman to Arabic
ROT13
Rule 110
Scrambled Sort
Set
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars GPT
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Tic-tac-toe
Time Distance
Tongue-twisters
Topological Sort
Tower of Hanoi
Transpose Sentence
Trinomial Triangle
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Apéry’s Constant
Binary Lambda Calculus
Calendar
Connect Four
Continued Fractions
Crossword
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
Multitap Input
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
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Language
All
><>
Assembly
AWK
Bash
BASIC
Berry
brainfuck
C
C#
C++
Civet
Clojure
COBOL
Coconut
Common Lisp
Crystal
D
Dart
Elixir
Erlang
F#
Factor
Forth
Fortran
Gleam
Go
GolfScript
Groovy
Haskell
Hexagony
J
Janet
Java
JavaScript
jq
Julia
K
Kotlin
Lua
Nim
OCaml
Pascal
Perl
PHP
PowerShell
Prolog
Python
R
Raku
Rockstar
Ruby
Rust
Scheme
sed
SQL
Swift
Tcl
TeX
V
VimL
Wren
Zig
Experimental Language
05AB1E
ALGOL 68
APL
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
Luau
Odin
Picat
Qore
Racket
Rebol
Rexx
Scala
Squirrel
Stax
Uiua
Umka
Vala
Vyxal
Hole
All
12 Days of Christmas
24 Game
99 Bottles of Beer
Abundant Numbers
Abundant Numbers (Long)
Arabic to Roman
Arithmetic Numbers
Arrows
Ascending Primes
ASCII Table
Billiards
brainfuck
Card Number Validation
Catalan Numbers
Catalan’s Constant
Christmas Trees
Collatz
CSS Colors
Cubes
Day of Week
DFA Simulator
Diamonds
Divisors
Emirp Numbers
Emirp Numbers (Long)
Emojify
Evil Numbers
Evil Numbers (Long)
Factorial Factorisation
Farey Sequence
Fibonacci
Fizz Buzz
Foo Fizz Buzz Bar
Forsyth–Edwards Notation
Fractions
Game of Life
Gijswijt’s Sequence
Happy Numbers
Happy Numbers (Long)
Hexdump
Hilbert Curve
Intersection
Inventory Sequence
ISBN
Jacobi Symbol
Kaprekar Numbers
Kolakoski Constant
Kolakoski Sequence
Leap Years
Levenshtein Distance
Leyland Numbers
ln 2
Look and Say
Lucky Numbers
Lucky Tickets
Mahjong
Mandelbrot
Maze
Medal Tally
Minesweeper
Morse Decoder
Morse Encoder
Musical Chords
N Queens
Niven Numbers
Niven Numbers (Long)
Number Spiral
Odious Numbers
Odious Numbers (Long)
Ordinal Numbers
PalindromemordnilaP
Pangram Grep
Partition Numbers
Pascal’s Triangle
Pernicious Numbers
Pernicious Numbers (Long)
Poker
Polyominoes
Prime Numbers
Prime Numbers (Long)
Proximity Grid
QR Decoder
Quine
Recamán
Repeating Decimals
Reverse Polish Notation
Reversi
Rijndael S-box
Rock-paper-scissors-Spock-lizard
Roman to Arabic
ROT13
Rule 110
Scrambled Sort
Set
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars GPT
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Tic-tac-toe
Time Distance
Tongue-twisters
Topological Sort
Tower of Hanoi
Transpose Sentence
Trinomial Triangle
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Experimental Hole
Apéry’s Constant
Binary Lambda Calculus
Calendar
Connect Four
Continued Fractions
Crossword
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
Multitap Input
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
Hole
Golfer
Bytes
Time
Submitted
Billiards
albanian-laundromat
240
266ms
12 hours ago
Zodiac Signs
albanian-laundromat
221
350ms
13 hours ago
Emojify
edsrzf
🥈
177
357ms
23 hours ago
Transpose Sentence
albanian-laundromat
176
320ms
27 hours ago
Continued Fractions
albanian-laundromat
200
315ms
27 hours ago
Fibonacci
Pyroan
82
292ms
35 hours ago
Niven Numbers (Long)
b-illy
🥇
102
348ms
38 hours ago
γ
JOrE20
1,050
290ms
41 hours ago
Fibonacci
BREMAUCY
83
310ms
45 hours ago
Tower of Hanoi
gigaprofisi
3,648
296ms
2 days ago
Prime Numbers (Long)
albanian-laundromat
113
608ms
2 days ago
Zeckendorf Representation
albanian-laundromat
161
365ms
2 days ago
Gray Code Encoder
albanian-laundromat
103
346ms
2 days ago
Fizz Buzz
amazingalek
149
282ms
2 days ago
QR Decoder
edsrzf
🥉
218
293ms
2 days ago
Niven Numbers
albanian-laundromat
🥇
87
246ms
3 days ago
Happy Numbers (Long)
albanian-laundromat
🥇
130
245ms
3 days ago
Evil Numbers
emplv
81
243ms
3 days ago
Hexagonal Spiral
bitsandbeyond
332
240ms
4 days ago
Van Eck Sequence
dokutan
1,334
251ms
6 days ago
Vampire Numbers
dokutan
830
250ms
6 days ago
Trinomial Triangle
dokutan
1,314
250ms
6 days ago
Tower of Hanoi
dokutan
318
250ms
6 days ago
Smith Numbers
dokutan
1,314
246ms
6 days ago
Rijndael S-box
dokutan
686
250ms
6 days ago
N Queens
dokutan
802
239ms
6 days ago
Lucky Numbers
dokutan
2,822
237ms
6 days ago
Look and Say
dokutan
470
246ms
6 days ago
Leyland Numbers
dokutan
762
252ms
6 days ago
Kaprekar Numbers
dokutan
470
245ms
6 days ago
Inventory Sequence
dokutan
1,126
244ms
6 days ago
Hilbert Curve
dokutan
🥉
506
243ms
6 days ago
Hexagonal Spiral
dokutan
398
245ms
6 days ago
Happy Numbers (Long)
dokutan
534
250ms
6 days ago
Factorial Factorisation
dokutan
662
249ms
6 days ago
Emirp Numbers (Long)
dokutan
838
249ms
6 days ago
Diamonds
dokutan
270
250ms
6 days ago
Cubes
dokutan
562
249ms
6 days ago
Ascending Primes
dokutan
438
237ms
6 days ago
24 Game
dokutan
3,506
234ms
6 days ago
Mandelbrot
dokutan
406
239ms
6 days ago
Reversi
Lv0Sys
349
254ms
7 days ago
𝑒
KasperKivimaeki
180
250ms
7 days ago
Scrambled Sort
Lv0Sys
291
251ms
8 days ago
Number Spiral
CaedenHarper
161
245ms
8 days ago
Ordinal Numbers
KasperKivimaeki
🥉
137
245ms
8 days ago
Niven Numbers
KasperKivimaeki
🥇
87
240ms
8 days ago
Collatz
KasperKivimaeki
💎
104
237ms
8 days ago
Smith Numbers
KasperKivimaeki
182
340ms
8 days ago
Abundant Numbers (Long)
Florian-Mt
130
254ms
8 days ago
Abundant Numbers
Florian-Mt
129
239ms
8 days ago
Set
Lv0Sys
259
248ms
8 days ago
Polyominoes
Lv0Sys
🥉
519
255ms
8 days ago
24 Game
rucin93
💎
362
268ms
9 days ago
24 Game
Lv0Sys
🥈
405
330ms
9 days ago
Catalan Numbers
KasperKivimaeki
134
240ms
9 days ago
United States
edsrzf
195
273ms
10 days ago
Niven Numbers (Long)
CaedenHarper
🥇
102
342ms
10 days ago
Tic-tac-toe
albanian-laundromat
190
288ms
11 days ago
ASCII Table
albanian-laundromat
179
269ms
11 days ago
Fizz Buzz
b-illy
122
306ms
11 days ago
Niven Numbers
b-illy
🥇
87
323ms
11 days ago
Quine
CornerMercury
🥇
112
302ms
11 days ago
Fibonacci
CornerMercury
🥇
79
300ms
11 days ago
Scrambled Sort
snoozingnewt
272
262ms
13 days ago
Gray Code Decoder
albanian-laundromat
123
255ms
13 days ago
Smooth Numbers
GolfingSuccess
150
413ms
13 days ago
Mandelbrot
albanian-laundromat
184
285ms
14 days ago
Fizz Buzz
ian-h-chamberlain
140
263ms
14 days ago
Tower of Hanoi
Schmitt-Very-Cool
160
265ms
14 days ago
Happy Numbers
CaedenHarper
110
254ms
14 days ago
Van Eck Sequence
CaedenHarper
122
284ms
14 days ago
SI Units
CaedenHarper
🥈
642
416ms
14 days ago
Rock-paper-scissors-Spock-lizard
CaedenHarper
396
295ms
14 days ago
Tower of Hanoi
CaedenHarper
95
290ms
14 days ago
Van Eck Sequence
albanian-laundromat
129
257ms
14 days ago
Christmas Trees
albanian-laundromat
142
255ms
14 days ago
Leap Years
albanian-laundromat
93
255ms
14 days ago
12 Days of Christmas
albanian-laundromat
522
251ms
14 days ago
Happy Numbers
albanian-laundromat
111
247ms
14 days ago