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
Pangram Grep
HumanoidCPU
155
9 hours ago
φ
DialFrost
🥉
175
17 hours ago
Arrows
MisterrLuck
351
23 hours ago
Card Number Validation
rucin93
144
a day ago
Pangram Grep
klixel
🥇
98
a day ago
Abundant Numbers (Long)
MeWhenI
80
a day ago
Prime Numbers
edsrzf
🥇
61
3 days ago
Card Number Validation
Ernest1338
275
3 days ago
Rijndael S-box
AdrienHache
💎
123
3 days ago
Diamonds
WillConker
156
4 days ago
Divisors
CaedenHarper
🥇
78
5 days ago
QR Decoder
madex
913
5 days ago
Fizz Buzz
pardouin
100
5 days ago
Collatz
unfinishedprogram
103
5 days ago
Gijswijt’s Sequence
Shanethegamer
2,020
5 days ago
Quine
edsrzf
115
6 days ago
Abundant Numbers
stackofbears
79
7 days ago
Abundant Numbers (Long)
stackofbears
80
7 days ago
Card Number Validation
JayXon
💎
106
7 days ago
Emirp Numbers (Long)
Shanethegamer
1,176
7 days ago
Fizz Buzz
refrogerator
208
7 days ago
Niven Numbers (Long)
pardouin
🥇
77
8 days ago
Forsyth–Edwards Notation
dokutan
508
9 days ago
Sierpiński Triangle
dokutan
234
9 days ago
Pascal’s Triangle
DialFrost
85
10 days ago
Seven Segment
stefangimmillaro
198
10 days ago
Emirp Numbers
acotis
149
10 days ago
Rule 110
dokutan
1,982
10 days ago
Sierpiński Triangle
acotis
107
11 days ago
Spelling Numbers
lynn
🥈
434
11 days ago
Factorial Factorisation
xyangst
206
11 days ago
Spelling Numbers
acotis
495
11 days ago
Inventory Sequence
dokutan
1,729
11 days ago
Inventory Sequence
klixel
157
11 days ago
12 Days of Christmas
dokutan
526
12 days ago
Arabic to Roman
acotis
262
12 days ago
Pascal’s Triangle
acotis
125
12 days ago
Spelling Numbers
avila-gabriel
918
12 days ago
Pascal’s Triangle
avila-gabriel
222
12 days ago
Collatz
avila-gabriel
116
12 days ago
Leap Years
avila-gabriel
95
12 days ago
Fibonacci
avila-gabriel
118
12 days ago
Fibonacci
leo-minton
98
12 days ago
Vampire Numbers
stefangimmillaro
🥉
175
14 days ago
99 Bottles of Beer
acotis
392
14 days ago
Abundant Numbers
orifu
85
15 days ago
PalindromemordnilaP
acotis
🥈
154
15 days ago
Quine
CaedenHarper
🥇
66
15 days ago
Transpose Sentence
KatieLG
336
15 days ago
Card Number Validation
acotis
🥉
123
16 days ago
99 Bottles of Beer
Alfiecxn
483
16 days ago
Collatz
sean-niemann
94
16 days ago
Prime Numbers
acotis
63
17 days ago
Farey Sequence
acotis
148
17 days ago
Prime Numbers (Long)
acotis
🥇
67
18 days ago
Lucky Numbers
acotis
127
18 days ago
Fizz Buzz
snoozingnewt
110
18 days ago
Cubes
dokutan
914
18 days ago
Evil Numbers (Long)
pardouin
66
18 days ago
Odious Numbers (Long)
pardouin
🥉
66
18 days ago
Odious Numbers
pardouin
65
18 days ago
Lucky Numbers
lynn
🥉
105
18 days ago
99 Bottles of Beer
dokutan
455
19 days ago
Gijswijt’s Sequence
dokutan
213
19 days ago
Collatz
cdesodt
108
19 days ago
Pangram Grep
xyangst
202
21 days ago
Farey Sequence
xyangst
250
22 days ago
Card Number Validation
MeWhenI
164
23 days ago
ISBN
MeWhenI
212
23 days ago
Fizz Buzz
drewtato
103
23 days ago
Evil Numbers
pardouin
66
23 days ago
Fibonacci
xyangst
79
24 days ago
Ascending Primes
nullie
128
24 days ago
Gijswijt’s Sequence
Mabeloid
2,020
25 days ago
Number Spiral
Mabeloid
320
25 days ago