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
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brainfuck
Card Number Validation
Catalan Numbers
Catalan’s Constant
Christmas Trees
Collatz
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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
DFA Simulator
antimon2
🥈
136
6 hours ago
Day of Week
antimon2
💎
144
8 hours ago
γ
CaedenHarper
59
2 days ago
Catalan’s Constant
CaedenHarper
64
2 days ago
Odious Numbers
sean-niemann
🥇
33
3 days ago
π
CaedenHarper
45
5 days ago
Pernicious Numbers (Long)
pardouin
47
5 days ago
PalindromemordnilaP
antimon2
60
6 days ago
Pascal’s Triangle
antimon2
🥉
45
7 days ago
Ordinal Numbers
antimon2
🥇
71
7 days ago
Number Spiral
antimon2
🥈
78
7 days ago
ISBN
antimon2
🥇
63
7 days ago
Fizz Buzz
antimon2
59
7 days ago
Foo Fizz Buzz Bar
antimon2
🥉
75
7 days ago
Reverse Polish Notation
antimon2
🥈
97
9 days ago
24 Game
antimon2
💎
136
9 days ago
Evil Numbers
anter69
93
12 days ago
Polyominoes
dokutan
1,328
13 days ago
Fizz Buzz
aliakseikalosha
77
15 days ago
Fizz Buzz
KingSkyrock
74
15 days ago
Quine
CaedenHarper
🥇
32
15 days ago
Card Number Validation
JayXon
💎
62
16 days ago
ASCII Table
msbranicky
286
18 days ago
CSS Colors
msbranicky
997
18 days ago
Tongue-twisters
msbranicky
420
18 days ago
Fizz Buzz
snoozingnewt
60
18 days ago
π
edsrzf
36
19 days ago
Card Number Validation
DialFrost
76
19 days ago
Card Number Validation
antimon2
70
20 days ago
Repeating Decimals
dokutan
239
20 days ago
Rule 110
dokutan
182
20 days ago
Sierpiński Triangle
HumanoidCPU
161
20 days ago
Pascal’s Triangle
HumanoidCPU
60
20 days ago
Reversi
Shanethegamer
113
20 days ago
CSS Colors
alemelis
824
21 days ago
Niven Numbers
TheLastZombie
49
21 days ago
Card Number Validation
MarcMush
91
21 days ago
Polyominoes
alemelis
🥉
319
23 days ago
N Queens
alemelis
117
23 days ago
λ
alemelis
179
24 days ago
Fibonacci
sean-niemann
38
24 days ago
Odious Numbers
emgordon154
40
24 days ago
Evil Numbers
emgordon154
40
24 days ago
𝑒
twolfive
🥇
31
24 days ago
√2
twolfive
🥇
36
24 days ago
φ
twolfive
🥇
37
24 days ago
τ
twolfive
🥇
40
24 days ago
π
twolfive
🥇
31
24 days ago
γ
twolfive
🥇
42
24 days ago
Vampire Numbers
twolfive
🥇
94
24 days ago
Quine
twolfive
🥇
32
24 days ago
Pernicious Numbers
twolfive
🥇
33
24 days ago
Niven Numbers (Long)
twolfive
🥇
41
24 days ago
Niven Numbers
twolfive
🥇
37
24 days ago
ln 2
twolfive
🥇
40
24 days ago
Happy Numbers (Long)
twolfive
🥇
51
24 days ago
Happy Numbers
twolfive
🥇
49
24 days ago
Fibonacci
twolfive
🥇
28
24 days ago
Catalan’s Constant
twolfive
🥇
46
24 days ago
Forsyth–Edwards Notation
alemelis
106
24 days ago
Niven Numbers (Long)
pardouin
🥇
41
24 days ago
Gijswijt’s Sequence
Mabeloid
2,008
25 days ago
Number Spiral
Mabeloid
308
25 days ago
Prime Numbers
Mabeloid
79
25 days ago
Prime Numbers (Long)
Mabeloid
5,956
25 days ago
Pernicious Numbers
alemelis
🥇
33
25 days ago
Fibonacci
emgordon154
39
25 days ago
Prime Numbers
JesseNoEyes
71
25 days ago
Prime Numbers (Long)
JesseNoEyes
73
25 days ago
Pernicious Numbers
Mabeloid
108
25 days ago
Pernicious Numbers (Long)
Mabeloid
20,670
25 days ago
Pascal’s Triangle
Mabeloid
777
25 days ago
Inventory Sequence
Mabeloid
2,631
25 days ago
Intersection
JayXon
💎
86
25 days ago
Rule 110
msbranicky
197
26 days ago