The
Calendar
hole will go live in approximately
6 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
Mahjong
Yax42
416
459ms
39 mins ago
United States
mwarvik
538
417ms
12 hours ago
Prime Numbers
mwarvik
89
344ms
12 hours ago
Seven Segment
mwarvik
383
409ms
12 hours ago
π
mwarvik
1,020
366ms
13 hours ago
𝑒
mwarvik
1,020
362ms
13 hours ago
λ
mwarvik
1,020
354ms
13 hours ago
τ
mwarvik
1,020
360ms
13 hours ago
φ
mwarvik
1,020
373ms
13 hours ago
√2
mwarvik
1,020
376ms
13 hours ago
ln 2
mwarvik
1,020
377ms
13 hours ago
γ
mwarvik
1,020
373ms
13 hours ago
Arrows
mwarvik
368
495ms
13 hours ago
Prime Numbers
albanian-laundromat
65
367ms
22 hours ago
Prime Numbers
AdrienHache
🥇
62
387ms
23 hours ago
99 Bottles of Beer
codewrite
310
416ms
26 hours ago
Arrows
amazingalek
245
358ms
26 hours ago
Lucky Numbers
AdrienHache
102
413ms
29 hours ago
Rijndael S-box
bitsandbeyond
🥉
158
373ms
30 hours ago
Hilbert Curve
Yax42
332
459ms
31 hours ago
Cubes
qrakhen
286
359ms
36 hours ago
99 Bottles of Beer
Yax42
245
369ms
36 hours ago
Lucky Numbers
Yax42
118
460ms
37 hours ago
Trinomial Triangle
tomtheisen
119
456ms
47 hours ago
Arithmetic Numbers
amazingalek
112
462ms
2 days ago
Abundant Numbers (Long)
amazingalek
91
387ms
2 days ago
Abundant Numbers
amazingalek
91
347ms
2 days ago
𝑒
amazingalek
1,020
324ms
2 days ago
√2
amazingalek
1,020
322ms
2 days ago
φ
amazingalek
1,020
323ms
2 days ago
τ
amazingalek
1,020
327ms
2 days ago
λ
amazingalek
1,020
331ms
2 days ago
γ
amazingalek
1,020
350ms
2 days ago
Tongue-twisters
amazingalek
394
331ms
2 days ago
Hexagonal Spiral
bitsandbeyond
339
434ms
2 days ago
Mahjong
tomh1012
2,194
2,187ms
2 days ago
Prime Numbers
KasperKivimaeki
64
352ms
2 days ago
12 Days of Christmas
qrakhen
523
394ms
2 days ago
Calendar
qrakhen
318
407ms
2 days ago
Partition Numbers
codewrite
120
405ms
2 days ago
Calendar
tomh1012
229
400ms
2 days ago
ROT13
amazingalek
150
400ms
3 days ago
Tongue-twisters
Yax42
397
364ms
3 days ago
Poker
Yax42
405
431ms
3 days ago
Gijswijt’s Sequence
Yax42
139
384ms
3 days ago
Polyominoes
Yax42
461
450ms
3 days ago
Leap Years
edsrzf
61
413ms
3 days ago
Transpose Sentence
volgavod
142
440ms
3 days ago
Arabic to Roman
deopea-david
392
393ms
4 days ago
Ordinal Numbers
amazingalek
123
409ms
4 days ago
Look and Say
amazingalek
1,301
394ms
4 days ago
ln 2
amazingalek
1,020
386ms
4 days ago
π
amazingalek
1,020
378ms
4 days ago
Transpose Sentence
amazingalek
157
491ms
4 days ago
Niven Numbers
amazingalek
69
437ms
4 days ago
Odious Numbers
amazingalek
89
387ms
4 days ago
Evil Numbers
amazingalek
88
462ms
4 days ago
Fibonacci
amazingalek
57
407ms
4 days ago
Divisors
amazingalek
94
429ms
4 days ago
Collatz
amazingalek
90
421ms
4 days ago
Tower of Hanoi
JayXon
🥇
69
406ms
4 days ago
12 Days of Christmas
deopea-david
638
426ms
5 days ago
Catalan’s Constant
amazingalek
1,020
360ms
5 days ago
CSS Colors
Yax42
177
429ms
5 days ago
CSS Colors
arcpolaris
2,569
427ms
6 days ago
Calendar
Yax42
204
429ms
6 days ago
Sierpiński Triangle
KasperKivimaeki
70
406ms
6 days ago
Fibonacci
Pyroan
52
368ms
7 days ago
QR Decoder
tomh1012
362
393ms
7 days ago
Divisors
codewrite
99
431ms
7 days ago
γ
JOrE20
1,020
321ms
7 days ago
Foo Fizz Buzz Bar
mwarvik
126
388ms
7 days ago
Foo Fizz Buzz Bar
amazingalek
126
368ms
7 days ago
Roman to Arabic
tomh1012
286
419ms
8 days ago
Morse Decoder
tomh1012
382
371ms
8 days ago
Polyominoes
tomh1012
648
411ms
8 days ago
Medal Tally
AdrienHache
166
374ms
8 days ago
Niven Numbers (Long)
amazingalek
🥇
69
407ms
8 days ago
Niven Numbers (Long)
mwarvik
🥇
69
383ms
8 days ago
Tutorial
mwarvik
73
383ms
8 days ago