The
Calendar
hole will go live in approximately
8 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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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
Day of Week
KatieLG
99
14ms
11 mins ago
Look and Say
albanian-laundromat
97
14ms
108 mins ago
Mahjong
bricknellj
264
71ms
2 hours ago
Mahjong
TheZwierzLF
578
835ms
4 hours ago
Christmas Trees
Matter1024
88
10ms
4 hours ago
Inventory Sequence
Bmrl7
65
14ms
4 hours ago
24 Game
Bmrl7
293
2,032ms
5 hours ago
Levenshtein Distance
Bmrl7
175
3,917ms
5 hours ago
Partition Numbers
Bmrl7
136
11ms
6 hours ago
Lucky Numbers
JOrE20
104
12ms
6 hours ago
PalindromemordnilaP
JOrE20
91
10ms
6 hours ago
12 Days of Christmas
Trildcookie
483
10ms
6 hours ago
Abundant Numbers (Long)
Trildcookie
68
70ms
7 hours ago
Sierpiński Triangle
CornerMercury
74
10ms
7 hours ago
Spelling Numbers
CornerMercury
345
13ms
8 hours ago
Polyominoes
CornerMercury
262
25ms
8 hours ago
Happy Numbers
CommandLeo
78
46ms
10 hours ago
Emirp Numbers (Long)
CommandLeo
94
201ms
10 hours ago
Emirp Numbers
CommandLeo
79
11ms
10 hours ago
Quine
te-chnical
32
11ms
10 hours ago
ASCII Table
CommandLeo
118
10ms
10 hours ago
Ascending Primes
CommandLeo
86
1,085ms
11 hours ago
Tower of Hanoi
te-chnical
74
12ms
16 hours ago
Morse Decoder
kg583
156
15ms
16 hours ago
12 Days of Christmas
te-chnical
571
10ms
17 hours ago
Calendar
emgordon154
99
17ms
19 hours ago
Reversi
madex
253
28ms
22 hours ago
Calendar
madex
105
32ms
22 hours ago
Number Spiral
Bmrl7
242
15ms
23 hours ago
Factorial Factorisation
Bmrl7
141
25ms
23 hours ago
Seven Segment
Bmrl7
139
22ms
24 hours ago
99 Bottles of Beer
CornerMercury
227
18ms
24 hours ago
Arabic to Roman
CommandLeo
151
38ms
25 hours ago
Diamonds
CornerMercury
83
19ms
25 hours ago
Musical Chords
blaztoma
150
12ms
26 hours ago
Morse Encoder
CornerMercury
183
15ms
27 hours ago
Prime Numbers
Matter1024
52
11ms
27 hours ago
Morse Encoder
blaztoma
165
17ms
27 hours ago
Abundant Numbers
Trildcookie
67
21ms
27 hours ago
Recamán
CommandLeo
71
12ms
28 hours ago
Reversi
YAJUE114514
521
20ms
29 hours ago
Christmas Trees
CornerMercury
77
13ms
29 hours ago
brainfuck
Bmrl7
212
21ms
29 hours ago
Smith Numbers
Bmrl7
141
3,865ms
29 hours ago
Time Distance
CornerMercury
248
17ms
29 hours ago
Polyominoes
YAJUE114514
237
894ms
29 hours ago
Prime Numbers
AdrienHache
🥇
40
11ms
29 hours ago
Vampire Numbers
CornerMercury
120
942ms
29 hours ago
Morse Decoder
FortuiteMan
156
10ms
30 hours ago
Tower of Hanoi
DrPrettyman
107
26ms
30 hours ago
99 Bottles of Beer
DrPrettyman
262
12ms
30 hours ago
Factorial Factorisation
CornerMercury
118
18ms
31 hours ago
Partition Numbers
codewrite
90
14ms
32 hours ago
QR Decoder
TheZwierzLF
325
11ms
35 hours ago
Calendar
Languag3
106
16ms
39 hours ago
Smith Numbers
HumanoidCPU
173
1,199ms
40 hours ago
Mahjong
snoozingnewt
316
29ms
42 hours ago
Vampire Numbers
snoozingnewt
132
305ms
43 hours ago
Calendar
snoozingnewt
101
19ms
43 hours ago
Sierpiński Triangle
snoozingnewt
81
13ms
43 hours ago
Tic-tac-toe
snoozingnewt
119
29ms
44 hours ago
Calendar
KasperKivimaeki
101
17ms
44 hours ago
Billiards
snoozingnewt
204
37ms
45 hours ago
Cubes
snoozingnewt
212
11ms
45 hours ago
Calendar
HPWiz
101
16ms
46 hours ago
Quine
martinorav
56
11ms
47 hours ago
Calendar
Florian-Mt
129
22ms
2 days ago
Calendar
KatieLG
101
17ms
2 days ago
Billiards
blaztoma
163
12ms
2 days ago
Time Distance
Bmrl7
293
18ms
2 days ago
Reverse Polish Notation
Bmrl7
136
27ms
2 days ago
Roman to Arabic
Lv0Sys
121
21ms
2 days ago
Medal Tally
Bmrl7
146
12ms
2 days ago
Day of Week
Bmrl7
🥇
85
15ms
2 days ago
Arabic to Roman
Lv0Sys
146
27ms
2 days ago
Pascal’s Triangle
Lv0Sys
57
12ms
2 days ago
Pernicious Numbers
JOrE20
49
11ms
2 days ago
Abundant Numbers
JOrE20
66
11ms
2 days ago
Abundant Numbers (Long)
JOrE20
67
22ms
2 days ago
Kolakoski Constant
TheZwierzLF
152
2,153ms
2 days ago