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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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><>
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
Musical Chords
blaztoma
148
12ms
3 hours ago
ASCII Table
HumanoidCPU
134
10ms
7 hours ago
Niven Numbers (Long)
edsrzf
54
18ms
7 hours ago
Inventory Sequence
sunleonid
57
32ms
9 hours ago
12 Days of Christmas
wboka
508
10ms
10 hours ago
Odious Numbers (Long)
michelebastione
53
11ms
11 hours ago
Prime Numbers (Long)
Carlos-EAC
758
14ms
11 hours ago
12 Days of Christmas
osNiko
585
10ms
11 hours ago
12 Days of Christmas
Carlos-EAC
2,489
11ms
11 hours ago
Catalan’s Constant
madex
293
23ms
13 hours ago
Star Wars Opening Crawl
blaztoma
283
11ms
13 hours ago
Reverse Polish Notation
blaztoma
127
16ms
13 hours ago
Mahjong
bricknellj
247
83ms
15 hours ago
Partition Numbers
blaztoma
66
38ms
15 hours ago
Recamán
sunleonid
🥇
61
31ms
16 hours ago
Seven Segment
osNiko
292
31ms
17 hours ago
Fractions
CornerMercury
🥇
73
19ms
18 hours ago
Hexagonal Spiral
KatieLG
403
11ms
19 hours ago
Zeckendorf Representation
JOrE20
162
12ms
19 hours ago
Game of Life
CornerMercury
136
13ms
19 hours ago
Look and Say
JOrE20
100
11ms
20 hours ago
Number Spiral
JOrE20
285
10ms
20 hours ago
Star Wars GPT
CornerMercury
127
11ms
20 hours ago
Lucky Numbers
Bmrl7
96
110ms
21 hours ago
Vampire Numbers
TheZwierzLF
389
4,697ms
21 hours ago
Look and Say
Bmrl7
106
11ms
21 hours ago
Tutorial
blaztoma
92
11ms
22 hours ago
Farey Sequence
Bmrl7
90
12ms
22 hours ago
CSS Colors
ahmetdemirag
794
12ms
23 hours ago
Sierpiński Triangle
CornerMercury
68
10ms
23 hours ago
24 Game
adammielniczuk
332
1,012ms
24 hours ago
Topological Sort
Lv0Sys
171
14ms
25 hours ago
Trinomial Triangle
Bmrl7
71
10ms
25 hours ago
Pascal’s Triangle
Bmrl7
61
10ms
25 hours ago
Kaprekar Numbers
CommandLeo
132
4,873ms
25 hours ago
Ten-pin Bowling
Bmrl7
200
10ms
25 hours ago
ROT13
ahmetdemirag
69
10ms
25 hours ago
Hilbert Curve
Lv0Sys
305
17ms
26 hours ago
Calendar
ahmetdemirag
101
17ms
26 hours ago
Minesweeper
Lv0Sys
192
83ms
26 hours ago
Pernicious Numbers (Long)
edsrzf
54
16ms
27 hours ago
Tower of Hanoi
Lv0Sys
60
12ms
27 hours ago
Fizz Buzz
benanlam
144
10ms
28 hours ago
Prime Numbers
mattyhempstead
44
10ms
28 hours ago
CSS Colors
benanlam
5,169
12ms
28 hours ago
Collatz
benanlam
84
16ms
28 hours ago
Set
TheZwierzLF
168
29ms
35 hours ago
Calendar
CaedenHarper
99
16ms
36 hours ago
Day of Week
KatieLG
99
14ms
38 hours ago
Look and Say
albanian-laundromat
97
14ms
39 hours ago
Mahjong
TheZwierzLF
578
835ms
42 hours ago
Christmas Trees
Matter1024
88
10ms
42 hours ago
Inventory Sequence
Bmrl7
65
14ms
42 hours ago
24 Game
Bmrl7
293
2,032ms
43 hours ago
Levenshtein Distance
Bmrl7
175
553ms
43 hours ago
Partition Numbers
Bmrl7
136
10ms
44 hours ago
Lucky Numbers
JOrE20
104
12ms
44 hours ago
PalindromemordnilaP
JOrE20
91
10ms
44 hours ago
12 Days of Christmas
Trildcookie
483
10ms
44 hours ago
Abundant Numbers (Long)
Trildcookie
68
70ms
45 hours ago
Spelling Numbers
CornerMercury
345
13ms
46 hours ago
Polyominoes
CornerMercury
262
25ms
46 hours ago
Happy Numbers
CommandLeo
78
46ms
2 days ago
Emirp Numbers (Long)
CommandLeo
94
201ms
2 days ago
Emirp Numbers
CommandLeo
79
11ms
2 days ago
Quine
te-chnical
32
11ms
2 days ago
ASCII Table
CommandLeo
118
10ms
2 days ago
Ascending Primes
CommandLeo
86
1,085ms
2 days ago
Tower of Hanoi
te-chnical
74
12ms
2 days ago
Morse Decoder
kg583
156
15ms
2 days ago
12 Days of Christmas
te-chnical
571
10ms
2 days ago
Calendar
emgordon154
99
17ms
2 days ago
Reversi
madex
253
25ms
2 days ago
Calendar
madex
105
16ms
2 days ago
Number Spiral
Bmrl7
242
12ms
2 days ago
Factorial Factorisation
Bmrl7
141
25ms
2 days ago
Seven Segment
Bmrl7
139
10ms
2 days ago
99 Bottles of Beer
CornerMercury
227
10ms
2 days ago
Arabic to Roman
CommandLeo
151
38ms
2 days ago
Diamonds
CornerMercury
83
18ms
2 days ago