The
Calendar
hole will go live in approximately
5 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
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
Bytes
Time
Submitted
Musical Chords
dokutan
477
953ms
42 mins ago
Arrows
BREMAUCY
146
600ms
46 mins ago
Tower of Hanoi
Natanaelel
57
484ms
33 hours ago
ASCII Table
HumanoidCPU
130
554ms
40 hours ago
Calendar
emgordon154
98
528ms
2 days ago
Vampire Numbers
TheZwierzLF
753
4,936ms
2 days ago
Calendar
CaedenHarper
98
507ms
2 days ago
Day of Week
KatieLG
99
574ms
2 days ago
Mahjong
TheZwierzLF
563
3,031ms
3 days ago
Morse Decoder
kg583
150
610ms
3 days ago
Smith Numbers
HumanoidCPU
168
1,583ms
4 days ago
Mahjong
snoozingnewt
308
958ms
4 days ago
Vampire Numbers
snoozingnewt
132
713ms
4 days ago
Calendar
snoozingnewt
99
573ms
4 days ago
Sierpiński Triangle
snoozingnewt
81
390ms
4 days ago
Tic-tac-toe
snoozingnewt
111
715ms
4 days ago
Billiards
snoozingnewt
196
723ms
4 days ago
Calendar
KatieLG
101
587ms
5 days ago
Kolakoski Constant
TheZwierzLF
142
2,667ms
5 days ago
Calendar
pardouin
98
612ms
6 days ago
Diamonds
TheZwierzLF
118
830ms
6 days ago
Reverse Polish Notation
TheZwierzLF
193
655ms
6 days ago
Factorial Factorisation
TheZwierzLF
173
622ms
6 days ago
Happy Numbers (Long)
TheZwierzLF
125
416ms
6 days ago
12 Days of Christmas
TheZwierzLF
470
498ms
6 days ago
Semiprime Numbers
HumanoidCPU
117
653ms
6 days ago
Tower of Hanoi
emgordon154
55
502ms
6 days ago
Tower of Hanoi
JayXon
🥇
52
431ms
6 days ago
Tower of Hanoi
CornerMercury
🥉
54
428ms
7 days ago
Calendar
kg583
98
532ms
7 days ago
24 Game
kg583
181
2,525ms
7 days ago
Calendar
ryyyn
99
548ms
7 days ago
Calendar
HumanoidCPU
142
486ms
7 days ago
Scrambled Sort
sean-niemann
78
527ms
7 days ago
Topological Sort
sean-niemann
114
640ms
7 days ago
Calendar
AlephSquirrel
99
651ms
8 days ago
Calendar
ovs-code
87
407ms
8 days ago
Calendar
CornerMercury
98
542ms
8 days ago
Van Eck Sequence
CornerMercury
56
467ms
8 days ago
Snake
kg583
151
485ms
8 days ago
Reverse Polish Notation
albanian-laundromat
125
510ms
8 days ago
Leyland Numbers
TheZwierzLF
95
586ms
9 days ago
Roman to Arabic
CornerMercury
89
480ms
9 days ago
𝑒
CornerMercury
48
383ms
9 days ago
√2
CornerMercury
49
433ms
9 days ago
Lucky Tickets
CornerMercury
🥇
88
456ms
9 days ago
ln 2
CornerMercury
53
339ms
9 days ago
Day of Week
CornerMercury
82
517ms
9 days ago
Catalan Numbers
CornerMercury
🥇
41
422ms
9 days ago
γ
JOrE20
1,011
369ms
9 days ago
Recamán
Lydxn
🥇
57
416ms
9 days ago
Tower of Hanoi
gigaprofisi
3,615
2,620ms
9 days ago
Repeating Decimals
CaedenHarper
181
615ms
9 days ago
Emirp Numbers (Long)
TheZwierzLF
100
1,027ms
9 days ago
Emirp Numbers
albanian-laundromat
70
696ms
9 days ago
Sierpiński Triangle
TheZwierzLF
93
474ms
10 days ago
γ
emgordon154
314
4,998ms
10 days ago
Abundant Numbers
TheZwierzLF
67
362ms
10 days ago
Billiards
kg583
159
405ms
11 days ago
CSS Colors (Inverse)
TheZwierzLF
2,093
2,879ms
12 days ago
Morse Decoder
TheZwierzLF
292
672ms
12 days ago
Arrows
TheZwierzLF
264
954ms
12 days ago
Set
TheZwierzLF
159
547ms
12 days ago
Seven Segment
TheZwierzLF
197
964ms
12 days ago
Tic-tac-toe
TheZwierzLF
145
1,874ms
12 days ago
Transpose Sentence
TheZwierzLF
80
434ms
12 days ago
Zeckendorf Representation
TheZwierzLF
192
607ms
12 days ago
Zodiac Signs
TheZwierzLF
190
667ms
12 days ago
Emojify
dokutan
153
497ms
12 days ago
Reversi
snoozingnewt
161
741ms
12 days ago
Hilbert Curve
snoozingnewt
349
898ms
12 days ago
Poker
TheZwierzLF
459
1,687ms
12 days ago
Transpose Sentence
snoozingnewt
88
449ms
12 days ago
Topological Sort
snoozingnewt
116
537ms
13 days ago
Hexagonal Spiral
bitsandbeyond
166
505ms
13 days ago
Arabic to Roman
TheZwierzLF
161
775ms
13 days ago
Christmas Trees
TheZwierzLF
83
421ms
13 days ago
Farey Sequence
TheZwierzLF
211
630ms
13 days ago
Roman to Arabic
snoozingnewt
111
611ms
13 days ago
Vampire Numbers
CaedenHarper
120
1,277ms
13 days ago