The
Mandelbrot
hole will go live in approximately
2 hours
. Why not try and solve it ahead of time?
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99 Bottles of Beer
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brainfuck
Card Number Validation
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Catalan’s Constant
Christmas Trees
Collatz
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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
Intersection
Inventory Sequence
ISBN
Jacobi Symbol
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Kolakoski Constant
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Leap Years
Levenshtein Distance
Leyland Numbers
ln 2
Look and Say
Lucky Numbers
Lucky Tickets
Mahjong
Maze
Medal Tally
Morse Decoder
Morse Encoder
Musical Chords
N Queens
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Niven Numbers (Long)
Number Spiral
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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
Transpose Sentence
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Apéry’s Constant
Calendar
Connect Four
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
Hilbert Curve
Mandelbrot
Minesweeper
NFA Simulator
Odd Polyomino Tiling
p-adic Expansion
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QR Encoder
Quadratic Formula
Semiprime Numbers
Snake
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Trinomial Triangle
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Assembly
AWK
Bash
BASIC
Berry
brainfuck
C
C#
C++
Civet
Clojure
COBOL
Coconut
Common Lisp
Crystal
D
Dart
Elixir
F#
Factor
Forth
Fortran
Gleam
Go
GolfScript
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
Erlang
Fennel
Groovy
Harbour
Hare
Haxe
Hush
Hy
iogii
Odin
Picat
Qore
Racket
Rebol
Rexx
Scala
Squirrel
Stax
Uiua
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
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
Maze
Medal Tally
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
Transpose Sentence
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Experimental Hole
Apéry’s Constant
Calendar
Connect Four
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
Hilbert Curve
Mandelbrot
Minesweeper
NFA Simulator
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Snake
Sphenic Numbers
Trinomial Triangle
Turtle
Tutorial
Hole
Golfer
Bytes
Submitted
Mandelbrot
dokutan
445
4 hours ago
Mandelbrot
DialFrost
195
10 hours ago
Mandelbrot
edsrzf
207
10 hours ago
Tongue-twisters
Mukundan314
🥈
358
11 hours ago
Abundant Numbers
Apataras
135
15 hours ago
Mandelbrot
HumanoidCPU
10,106
15 hours ago
Mandelbrot
stefangimmillaro
190
34 hours ago
Forsyth–Edwards Notation
Apataras
519
40 hours ago
DFA Simulator
edsrzf
💎
242
45 hours ago
Quine
gigaprofisi
172
46 hours ago
Mandelbrot
sean-niemann
184
2 days ago
τ
Apataras
377
2 days ago
CSS Colors
Apataras
6,331
2 days ago
Fizz Buzz
DABANANAMAN120
296
4 days ago
Tutorial
DABANANAMAN120
175
4 days ago
Odious Numbers (Long)
Apataras
100
4 days ago
Odious Numbers
Apataras
99
4 days ago
Look and Say
Apataras
169
4 days ago
π
Apataras
348
4 days ago
Fibonacci
123mjb
111
5 days ago
τ
sean-niemann
193
5 days ago
π
sean-niemann
193
5 days ago
Card Number Validation
Apataras
145
5 days ago
Day of Week
Apataras
💎
106
5 days ago
ln 2
Apataras
💎
175
6 days ago
Sierpiński Triangle
sean-niemann
🥇
112
7 days ago
Lucky Tickets
ravnskjaer
1,001
8 days ago
Foo Fizz Buzz Bar
ejini6969
173
8 days ago
Fizz Buzz
ejini6969
🥇
127
8 days ago
Evil Numbers (Long)
Apataras
101
8 days ago
24 Game
sean-niemann
💎
430
8 days ago
Arabic to Roman
dokutan
306
9 days ago
Arithmetic Numbers
JayXon
🥈
137
9 days ago
𝑒
gigaprofisi
1,073
10 days ago
Mandelbrot
MeWhenI
740
10 days ago
Fizz Buzz
albanian-laundromat
186
10 days ago
Fizz Buzz
Apataras
🥇
127
11 days ago
99 Bottles of Beer
Apataras
343
11 days ago
Fizz Buzz
rockoac5
138
11 days ago
Fibonacci
Apataras
🥇
94
11 days ago
Tutorial
Apataras
113
13 days ago
Evil Numbers
codewrite
169
13 days ago
Arithmetic Numbers
Apataras
141
13 days ago
Niven Numbers (Long)
fuzzylojik-golf
118
13 days ago
Niven Numbers
fuzzylojik-golf
🥇
103
13 days ago
Forsyth–Edwards Notation
edsrzf
197
13 days ago
Collatz
Schmitt-Very-Cool
135
14 days ago
Emirp Numbers
Schmitt-Very-Cool
253
14 days ago
24 Game
MeWhenI
🥈
431
15 days ago
24 Game
rucin93
🥉
438
15 days ago
Hexdump
edsrzf
272
15 days ago
Scrambled Sort
h3ra993huskp
286
15 days ago
24 Game
DialFrost
445
16 days ago
Ten-pin Bowling
DialFrost
280
18 days ago
Fizz Buzz
BambooleanLogic
145
18 days ago
Evil Numbers
perlebach
110
20 days ago
Proximity Grid
sean-niemann
186
21 days ago
Scrambled Sort
ravnskjaer
373
21 days ago
Star Wars GPT
DialFrost
🥉
294
21 days ago
Quine
Lv0Sys
176
22 days ago
ASCII Table
sean-niemann
181
22 days ago
Emojify
dokutan
337
23 days ago
Recamán
dokutan
208
23 days ago
Scrambled Sort
DialFrost
287
23 days ago
Scrambled Sort
Schmitt-Very-Cool
495
24 days ago
Proximity Grid
edsrzf
187
24 days ago
Divisors
edsrzf
124
24 days ago
Scrambled Sort
edsrzf
💎
233
24 days ago
Pernicious Numbers
b-illy
🥇
98
25 days ago
Fibonacci
Bozrem
127
25 days ago
24 Game
stefangimmillaro
503
25 days ago
Fibonacci
perlebach
114
26 days ago
Set
DialFrost
296
26 days ago
Polygon Triangulations
Shanethegamer
4,379
27 days ago
Fibonacci
fuzzylojik-golf
🥇
94
2 Jun 2025