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Calendar
hole will go live in approximately
10 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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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
Christmas Trees
acotis
🥇
89
142ms
75 mins ago
Tower of Hanoi
emgordon154
72
140ms
7 hours ago
Catalan Numbers
kumavale
💎
135
133ms
25 hours ago
Tower of Hanoi
JayXon
🥇
71
125ms
34 hours ago
12 Days of Christmas
acotis
🥇
474
400ms
2 days ago
Fibonacci
ian-h-chamberlain
🥇
64
133ms
2 days ago
24 Game
rucin93
🥉
317
170ms
3 days ago
24 Game
lynn
💎
284
1,732ms
3 days ago
Billiards
acotis
🥈
231
171ms
3 days ago
γ
JOrE20
1,050
132ms
3 days ago
24 Game
acotis
🥈
294
722ms
3 days ago
Tongue-twisters
prestosilver
543
124ms
3 days ago
Mandelbrot
acotis
🥇
168
225ms
4 days ago
Pernicious Numbers (Long)
ian-h-chamberlain
84
141ms
4 days ago
Emirp Numbers (Long)
ian-h-chamberlain
154
159ms
4 days ago
Emirp Numbers
ian-h-chamberlain
153
140ms
4 days ago
Fizz Buzz
mwarvik
167
145ms
4 days ago
CSS Colors
acotis
🥈
725
220ms
5 days ago
Day of Week
JayXon
💎
222
210ms
5 days ago
Tongue-twisters
acotis
🥈
331
205ms
5 days ago
Day of Week
acotis
🥈
229
216ms
5 days ago
Tutorial
Multirious
105
141ms
5 days ago
Lucky Tickets
acotis
🥉
219
1,285ms
6 days ago
Hexagonal Spiral
bitsandbeyond
422
198ms
8 days ago
λ
JOrE20
1,023
108ms
8 days ago
Fizz Buzz
Florian-Mt
133
143ms
9 days ago
Arithmetic Numbers
Florian-Mt
116
189ms
9 days ago
Abundant Numbers
Florian-Mt
86
126ms
10 days ago
Abundant Numbers (Long)
Florian-Mt
87
127ms
10 days ago
Day of Week
luuumine
295
173ms
10 days ago
Kolakoski Sequence
luuumine
146
128ms
10 days ago
brainfuck
luuumine
360
161ms
11 days ago
Ordinal Numbers
ian-h-chamberlain
146
149ms
12 days ago
Factorial Factorisation
luuumine
187
132ms
12 days ago
Emirp Numbers (Long)
luuumine
143
146ms
12 days ago
Emirp Numbers
luuumine
142
133ms
12 days ago
Christmas Trees
luuumine
120
143ms
12 days ago
ROT13
luuumine
143
141ms
12 days ago
Divisors
CornerMercury
🥇
78
121ms
13 days ago
Divisors
BREMAUCY
🥇
78
121ms
13 days ago
Pernicious Numbers
luuumine
73
117ms
13 days ago
Pernicious Numbers (Long)
luuumine
77
118ms
13 days ago
Fibonacci
luuumine
69
121ms
13 days ago
Emojify
JayXon
💎
189
176ms
13 days ago
Collatz
Lv0Sys
102
128ms
13 days ago
Sudoku
acotis
🥈
520
227ms
13 days ago
Emojify
acotis
🥈
190
157ms
13 days ago
Happy Numbers
ian-h-chamberlain
126
124ms
16 days ago
Happy Numbers (Long)
ian-h-chamberlain
127
117ms
16 days ago
Lucky Tickets
lynn
224
195ms
16 days ago
Billiards
lynn
💎
224
192ms
16 days ago
Emojify
lynn
🥉
194
159ms
16 days ago
Niven Numbers
snoozingnewt
🥇
61
116ms
17 days ago
Pernicious Numbers
ian-h-chamberlain
72
117ms
17 days ago
Tower of Hanoi
luuumine
72
117ms
17 days ago
Pernicious Numbers (Long)
dokutan
76
119ms
18 days ago
Recamán
azure-blondon
123
149ms
18 days ago
Fibonacci
snoozingnewt
65
118ms
18 days ago
Tower of Hanoi
DialFrost
🥇
71
119ms
19 days ago
Tower of Hanoi
ian-h-chamberlain
574
116ms
19 days ago
Tower of Hanoi
sean-niemann
🥇
71
119ms
19 days ago
Happy Numbers
CaedenHarper
121
122ms
19 days ago
Happy Numbers (Long)
CaedenHarper
122
123ms
19 days ago
Billiards
ovs-code
🥉
233
245ms
19 days ago
Lucky Tickets
dokutan
4,782
607ms
19 days ago
Tower of Hanoi
dokutan
78
121ms
19 days ago
Tower of Hanoi
edsrzf
🥇
71
115ms
20 days ago
Quine
snoozingnewt
🥇
45
111ms
20 days ago
φ
KatieLG
1,022
196ms
20 days ago
Van Eck Sequence
KatieLG
1,688
222ms
20 days ago
Vampire Numbers
KatieLG
1,051
214ms
20 days ago
Trinomial Triangle
KatieLG
1,844
211ms
20 days ago
Tongue-twisters
KatieLG
510
196ms
20 days ago
Smith Numbers
KatieLG
1,654
213ms
20 days ago
Sierpiński Triangle
KatieLG
238
194ms
20 days ago
Rule 110
KatieLG
2,053
225ms
20 days ago
Recamán
KatieLG
818
210ms
20 days ago
Prime Numbers (Long)
KatieLG
4,259
244ms
20 days ago
Prime Numbers
KatieLG
114
160ms
20 days ago
Polyominoes
KatieLG
1,349
209ms
20 days ago