The
Calendar
hole will go live in approximately
38 hours
. 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
All Languages
><>
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
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
Bytes
Chars
Scoring
Bytes
Chars
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
Chars
Time
Submitted
Calendar
CaedenHarper
215
10ms
12 hours ago
Christmas Trees
JOrE20
105
9ms
17 hours ago
Kolakoski Sequence
JOrE20
83
10ms
17 hours ago
Tower of Hanoi
JOrE20
68
10ms
19 hours ago
Calendar
JOrE20
157
11ms
19 hours ago
Connect Four
albanian-laundromat
251
19ms
32 hours ago
Continued Fractions
rucin93
97
10ms
36 hours ago
Pangram Grep
plcc0
99
10ms
36 hours ago
Christmas Trees
albanian-laundromat
83
10ms
2 days ago
Trinomial Triangle
alexsave
79
10ms
2 days ago
Pascal’s Triangle
alexsave
66
10ms
2 days ago
Fibonacci
kelvinauta
97
27ms
2 days ago
Arrows
Protothor
135
13ms
2 days ago
Ordinal Numbers
NoneTheFewer
142
12ms
2 days ago
Leap Years
NoneTheFewer
102
10ms
2 days ago
Abundant Numbers
Protothor
84
9ms
2 days ago
Hexdump
Protothor
221
10ms
2 days ago
N Queens
JOrE20
203
12ms
2 days ago
Factorial Factorisation
JOrE20
189
10ms
2 days ago
Ascending Primes
Protothor
82
1,326ms
2 days ago
Tic-tac-toe
Protothor
138
12ms
3 days ago
Reverse Polish Notation
alexsave
103
11ms
3 days ago
Arithmetic Numbers
NoneTheFewer
236
82ms
3 days ago
Emojify
shandriy
183
11ms
3 days ago
Tower of Hanoi
nwellnhof
48
10ms
3 days ago
Multitap Input
JOrE20
258
11ms
3 days ago
Arabic to Roman
JOrE20
165
19ms
3 days ago
Prime Numbers
amazingalek
65
10ms
3 days ago
Kaprekar Numbers
edsrzf
72
3,670ms
4 days ago
Pangram Grep
mwarvik
121
10ms
4 days ago
Fibonacci
albanian-laundromat
36
9ms
4 days ago
12 Days of Christmas
amazingalek
479
9ms
4 days ago
Niven Numbers (Long)
fuzzylojik-golf
🥇
50
13ms
4 days ago
𝑒
fuzzylojik-golf
🥇
50
12ms
4 days ago
√2
JOrE20
173
31ms
4 days ago
Spelling Numbers
JOrE20
201
13ms
4 days ago
Seven Segment
JOrE20
296
10ms
4 days ago
Gray Code Decoder
JOrE20
75
17ms
4 days ago
Multitap Input
Andrey-Plotnikov
113
11ms
4 days ago
Calendar
Protothor
230
11ms
5 days ago
Game of Life
alexsave
115
10ms
5 days ago
τ
alexsave
126
10ms
5 days ago
π
alexsave
126
11ms
5 days ago
Medal Tally
alexsave
149
10ms
5 days ago
Fizz Buzz
wboka
🥇
56
10ms
5 days ago
Floyd-Steinberg Dithering
JOrE20
645
15ms
5 days ago
Pernicious Numbers (Long)
error256
59
15ms
5 days ago
Jacobi Symbol
JOrE20
149
11ms
5 days ago
Number Spiral
alexsave
166
10ms
5 days ago
Sudoku (Fill-in)
JOrE20
405
13ms
5 days ago
Number Spiral
JOrE20
253
9ms
5 days ago
Prime Numbers (Long)
JOrE20
57
23ms
5 days ago
Prime Numbers
JOrE20
43
9ms
5 days ago
QR Decoder
JOrE20
161
10ms
5 days ago
Reversi
JOrE20
358
11ms
5 days ago
Hexagonal Spiral
bitsandbeyond
194
10ms
5 days ago
99 Bottles of Beer
JOrE20
182
10ms
5 days ago
Tongue-twisters
blaztoma
313
9ms
6 days ago
Calendar
lukegustafson
185
13ms
6 days ago
Quine
LostSyntax21
41
10ms
6 days ago
PalindromemordnilaP
JOrE20
127
10ms
6 days ago
Reverse Polish Notation
JOrE20
104
11ms
6 days ago
Topological Sort
weliveinhell
172
13ms
6 days ago
Pangram Grep
JOrE20
76
10ms
6 days ago
Morse Decoder
targrik
148
10ms
6 days ago
12 Days of Christmas
Nemikolh
485
9ms
6 days ago
DFA Simulator
HumanoidCPU
154
11ms
7 days ago
Tower of Hanoi
te-chnical
89
10ms
7 days ago
𝑒
amazingalek
1,011
9ms
7 days ago
√2
amazingalek
1,011
10ms
7 days ago
φ
amazingalek
1,011
9ms
7 days ago
τ
amazingalek
1,011
10ms
7 days ago
λ
amazingalek
1,011
10ms
7 days ago
γ
amazingalek
1,011
10ms
7 days ago
Niven Numbers
albanian-laundromat
🥇
42
10ms
8 days ago
Calendar
voytxt
131
12ms
8 days ago
Continued Fractions
albanian-laundromat
111
10ms
8 days ago
Ordinal Numbers
amazingalek
110
12ms
8 days ago
Evil Numbers (Long)
JOrE20
51
9ms
8 days ago
Odious Numbers (Long)
JOrE20
50
9ms
8 days ago