The
Calendar
hole will go live in approximately
11 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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brainfuck
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iogii
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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
Tower of Hanoi
DialFrost
57
2ms
10 hours ago
99 Bottles of Beer
albanian-laundromat
238
2ms
11 hours ago
Polyominoes
albanian-laundromat
💎
364
73ms
13 hours ago
99 Bottles of Beer
DialFrost
221
3ms
14 hours ago
Foo Fizz Buzz Bar
albanian-laundromat
86
2ms
20 hours ago
PalindromemordnilaP
xsot
💎
58
20ms
21 hours ago
Sudoku (Fill-in)
canissimia
💎
130
3,162ms
24 hours ago
Odious Numbers
DialFrost
46
2ms
26 hours ago
Odious Numbers (Long)
DialFrost
47
2ms
26 hours ago
Niven Numbers (Long)
DialFrost
🥇
48
7ms
26 hours ago
Niven Numbers
DialFrost
🥇
42
2ms
26 hours ago
Pernicious Numbers (Long)
DialFrost
🥉
54
5ms
31 hours ago
Partition Numbers
DialFrost
🥈
58
2ms
33 hours ago
Star Wars GPT
canissimia
💎
90
1,955ms
2 days ago
γ
JOrE20
1,018
2ms
2 days ago
Tic-tac-toe
albanian-laundromat
109
142ms
3 days ago
Abundant Numbers
KasperKivimaeki
🥈
54
3ms
3 days ago
Star Wars Opening Crawl
canissimia
💎
178
2ms
3 days ago
ROT13
sean-niemann
💎
83
3ms
3 days ago
Emirp Numbers (Long)
DialFrost
💎
76
39ms
4 days ago
Smooth Numbers
GolfingSuccess
71
22ms
4 days ago
Catalan Numbers
DialFrost
🥉
150
13ms
4 days ago
N Queens
canissimia
💎
97
68ms
4 days ago
Arithmetic Numbers
xsot
🥈
60
2,929ms
4 days ago
Pernicious Numbers
KasperKivimaeki
🥇
40
2ms
4 days ago
Niven Numbers
KasperKivimaeki
49
2ms
4 days ago
Smith Numbers
KasperKivimaeki
💎
92
4,892ms
5 days ago
Fibonacci
KasperKivimaeki
37
2ms
5 days ago
Collatz
KasperKivimaeki
65
5ms
5 days ago
Abundant Numbers (Long)
KasperKivimaeki
57
34ms
5 days ago
Arithmetic Numbers
KasperKivimaeki
💎
59
3,072ms
5 days ago
Foo Fizz Buzz Bar
canissimia
🥇
84
2ms
5 days ago
Lucky Tickets
DialFrost
139
9ms
5 days ago
Van Eck Sequence
DialFrost
51
2ms
5 days ago
Emirp Numbers
DialFrost
77
3ms
5 days ago
Ascending Primes
DialFrost
🥈
82
4,211ms
5 days ago
Arithmetic Numbers
DialFrost
66
3,772ms
5 days ago
Smith Numbers
DialFrost
121
1,756ms
5 days ago
Abundant Numbers
DialFrost
55
3ms
5 days ago
Abundant Numbers (Long)
DialFrost
56
33ms
5 days ago
Hexagonal Spiral
bitsandbeyond
313
3ms
5 days ago
Kaprekar Numbers
canissimia
🥇
68
3,123ms
6 days ago
Fizz Buzz
canissimia
🥇
56
2ms
7 days ago
Gray Code Encoder
GolfingSuccess
62
8ms
7 days ago
Fizz Buzz
dokutan
60
2ms
7 days ago
Collatz
canissimia
🥇
58
6ms
8 days ago
Day of Week
snoozingnewt
50
3ms
8 days ago
Niven Numbers
snoozingnewt
48
2ms
8 days ago
Set
canissimia
💎
97
754ms
8 days ago
Factorial Factorisation
canissimia
💎
88
58ms
8 days ago
Reversi
canissimia
💎
108
14ms
8 days ago
Scrambled Sort
xsot
🥈
156
7ms
9 days ago
Scrambled Sort
canissimia
💎
132
211ms
9 days ago
Levenshtein Distance
canissimia
💎
111
2ms
10 days ago
Number Spiral
canissimia
💎
81
2ms
11 days ago
Quine
CornerMercury
56
2ms
12 days ago
Transpose Sentence
xsot
💎
54
3ms
12 days ago
Transpose Sentence
canissimia
🥈
55
5ms
12 days ago
Medal Tally
canissimia
🥇
80
2ms
13 days ago
Arithmetic Numbers
canissimia
62
14ms
13 days ago
Leyland Numbers
albanian-laundromat
87
3ms
13 days ago
Abundant Numbers
canissimia
💎
53
3ms
13 days ago
Abundant Numbers (Long)
canissimia
💎
53
25ms
13 days ago
Kolakoski Sequence
canissimia
🥇
44
2ms
14 days ago
Prime Numbers (Long)
canissimia
🥇
45
1,182ms
14 days ago
Gray Code Decoder
albanian-laundromat
55
11ms
14 days ago
Recamán
canissimia
💎
46
2ms
14 days ago
Lucky Numbers
canissimia
💎
59
193ms
14 days ago
Inventory Sequence
albanian-laundromat
58
2ms
15 days ago
Leap Years
canissimia
💎
44
3ms
15 days ago
Inventory Sequence
canissimia
🥇
43
1ms
15 days ago
Van Eck Sequence
canissimia
🥇
42
2ms
16 days ago
Lucky Tickets
canissimia
💎
64
7ms
16 days ago
Pangram Grep
albanian-laundromat
62
17ms
16 days ago
Van Eck Sequence
albanian-laundromat
57
2ms
16 days ago
Trinomial Triangle
canissimia
💎
56
2ms
16 days ago
Tongue-twisters
prestosilver
551
2ms
16 days ago
Tower of Hanoi
aksyristos
83
2ms
16 days ago
Pascal’s Triangle
sean-niemann
54
2ms
16 days ago
Pascal’s Triangle
canissimia
🥇
47
1ms
16 days ago