The
Kaprekar Numbers
hole will go live in
2 days
. Why not try and solve it ahead of time?
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Golfers
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12 Days of Christmas
24 Game
99 Bottles of Beer
Abundant Numbers
Abundant Numbers (Long)
Arabic to Roman
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Arrows
Ascending Primes
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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
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
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
Rule 110
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Time Distance
Tongue-twisters
Transpose Sentence
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
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Assembly
AWK
Bash
BASIC
Berry
brainfuck
C
C#
C++
Civet
Clojure
COBOL
Coconut
Crystal
D
Dart
Elixir
F#
Factor
Forth
Fortran
Go
GolfScript
Haskell
Hexagony
J
Janet
Java
JavaScript
jq
Julia
K
Kotlin
Lisp
Lua
Nim
OCaml
Pascal
Perl
PHP
PowerShell
Prolog
Python
R
Raku
Rockstar
Ruby
Rust
Scheme
sed
SQL
Swift
Tcl
TeX
V
VimL
Wren
Zig
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
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
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
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
Rule 110
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Time Distance
Tongue-twisters
Transpose Sentence
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Hole
Golfer
Bytes
Submitted
Fractions
IdkWhatIsIdk
198
7 hours ago
99 Bottles of Beer
IdkWhatIsIdk
395
7 hours ago
Spelling Numbers
snyderek
427
14 hours ago
Evil Numbers
aksyristos
104
a day ago
Evil Numbers (Long)
aksyristos
106
a day ago
Seven Segment
aksyristos
198
a day ago
12 Days of Christmas
IdkWhatIsIdk
563
a day ago
Fizz Buzz
IdkWhatIsIdk
129
a day ago
ISBN
IdkWhatIsIdk
235
a day ago
Arabic to Roman
tailorspy
552
a day ago
Vampire Numbers
MostParsingVex
363
a day ago
brainfuck
MostParsingVex
189
a day ago
Abundant Numbers (Long)
tailorspy
90
a day ago
Emirp Numbers (Long)
tailorspy
151
2 days ago
Farey Sequence
dokutan
146
2 days ago
π
m4xxh
1,214
3 days ago
Kolakoski Constant
Herbert00709
180
4 days ago
√2
Herbert00709
141
4 days ago
ln 2
Herbert00709
138
4 days ago
τ
Herbert00709
🥉
140
4 days ago
π
Herbert00709
🥉
140
4 days ago
Divisors
error256
89
4 days ago
Card Number Validation
sean-niemann
116
5 days ago
Fibonacci
CaedenHarper
71
5 days ago
Gijswijt’s Sequence
Shanethegamer
2,035
5 days ago
Transpose Sentence
tailorspy
148
6 days ago
Quine
edsrzf
106
6 days ago
Odious Numbers (Long)
Shanethegamer
88
6 days ago
Evil Numbers (Long)
Shanethegamer
91
6 days ago
Niven Numbers (Long)
nwellnhof
🥇
82
7 days ago
Niven Numbers
pardouin
72
8 days ago
Niven Numbers (Long)
pardouin
86
8 days ago
Fractions
GolfingSuccess
125
8 days ago
Fibonacci
pardouin
🥇
69
9 days ago
Pascal’s Triangle
DialFrost
96
10 days ago
Fizz Buzz
MatchaOnMuffins
231
10 days ago
Factorial Factorisation
roupiq
🥉
120
11 days ago
Sudoku (Fill-in)
ovs-code
🥇
197
11 days ago
Arabic to Roman
ovs-code
💎
144
11 days ago
Ten-pin Bowling
ovs-code
🥈
160
11 days ago
τ
ovs-code
💎
130
11 days ago
π
ovs-code
💎
130
11 days ago
Ordinal Numbers
sciencejiho
178
11 days ago
Inventory Sequence
klixel
104
11 days ago
𝑒
Herbert00709
122
12 days ago
Lucky Numbers
snyderek
163
12 days ago
Foo Fizz Buzz Bar
snyderek
🥉
130
12 days ago
Emirp Numbers
snyderek
120
12 days ago
Abundant Numbers (Long)
snyderek
91
12 days ago
Arithmetic Numbers
snyderek
104
12 days ago
Hexdump
sean-niemann
253
12 days ago
Prime Numbers
qewdweftr4g
126
13 days ago
Prime Numbers (Long)
Herbert00709
78
13 days ago
Prime Numbers
Herbert00709
77
13 days ago
Prime Numbers (Long)
Mandrzejy
80
13 days ago
Prime Numbers
Mandrzejy
79
13 days ago
Game of Life
inventshah
160
13 days ago
Transpose Sentence
snyderek
149
13 days ago
Game of Life
GolfingSuccess
151
13 days ago
Prime Numbers (Long)
RedzGoose
114
13 days ago
Fizz Buzz
allending0506
141
13 days ago
12 Days of Christmas
allending0506
605
13 days ago
Quine
allending0506
145
14 days ago
Farey Sequence
snyderek
118
14 days ago
Evil Numbers
snyderek
84
14 days ago
Evil Numbers (Long)
snyderek
82
14 days ago
Rijndael S-box
MostParsingVex
119
15 days ago
Quine
CaedenHarper
117
15 days ago
Pernicious Numbers
snyderek
84
16 days ago
Fibonacci
Emutis
91
16 days ago
Pernicious Numbers (Long)
snyderek
86
16 days ago
Prime Numbers
snyderek
77
16 days ago
Prime Numbers (Long)
snyderek
78
16 days ago
Abundant Numbers (Long)
eddienoon
136
16 days ago
Abundant Numbers
eddienoon
135
16 days ago