The
Kaprekar Numbers
hole will go live in
2 days
. Why not try and solve it ahead of time?
Recent Solutions
Golfers
Solutions
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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
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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
Sudoku
CaedenHarper
655
36 mins ago
Smith Numbers
dokutan
127
23 hours ago
Farey Sequence
dokutan
104
23 hours ago
Intersection
pardouin
🥉
101
a day ago
United States
KatieLG
125
a day ago
QR Decoder
KatieLG
222
a day ago
Ten-pin Bowling
KatieLG
198
a day ago
Rock-paper-scissors-Spock-lizard
KatieLG
269
a day ago
Arabic to Roman
KatieLG
162
a day ago
Poker
KatieLG
673
a day ago
Prime Numbers (Long)
KatieLG
62
a day ago
N Queens
KatieLG
167
a day ago
Repeating Decimals
KatieLG
200
a day ago
Happy Numbers
KatieLG
74
a day ago
SI Units
KatieLG
777
a day ago
Gijswijt’s Sequence
KatieLG
119
a day ago
Time Distance
KatieLG
269
a day ago
Sudoku
KatieLG
534
a day ago
ISBN
KatieLG
103
a day ago
DFA Simulator
KatieLG
199
a day ago
π
m4xxh
1,011
3 days ago
24 Game
KatieLG
272
4 days ago
Catalan’s Constant
KatieLG
181
4 days ago
Seven Segment
RedzGoose
196
4 days ago
Card Number Validation
sean-niemann
89
5 days ago
24 Game
kg583
187
5 days ago
Cubes
HumanoidCPU
295
6 days ago
Star Wars Opening Crawl
dokutan
5,489
6 days ago
Repeating Decimals
emgordon154
🥇
108
7 days ago
Rijndael S-box
emgordon154
206
8 days ago
Tongue-twisters
emgordon154
344
8 days ago
Leap Years
emgordon154
50
9 days ago
Ten-pin Bowling
dokutan
278
9 days ago
Niven Numbers
RedzGoose
48
9 days ago
Card Number Validation
dokutan
122
10 days ago
Pangram Grep
emgordon154
69
10 days ago
Foo Fizz Buzz Bar
edsrzf
82
10 days ago
Fizz Buzz
edsrzf
58
10 days ago
QR Decoder
emgordon154
218
10 days ago
φ
kg583
🥇
53
11 days ago
Christmas Trees
Stockoh
87
11 days ago
Musical Chords
roguh
194
11 days ago
Poker
CaedenHarper
473
12 days ago
Repeating Decimals
CaedenHarper
207
12 days ago
Levenshtein Distance
annaproxy
90
12 days ago
Recamán
alemelis
78
12 days ago
Abundant Numbers (Long)
Mabeloid
75
13 days ago
Abundant Numbers
Mabeloid
74
13 days ago
Prime Numbers
kg583
🥇
38
13 days ago
Polyominoes
dokutan
1,315
13 days ago
Gijswijt’s Sequence
dokutan
198
13 days ago
Pascal’s Triangle
RedzGoose
83
14 days ago
Foo Fizz Buzz Bar
RedzGoose
91
14 days ago
Fizz Buzz
RedzGoose
62
14 days ago
PalindromemordnilaP
RedzGoose
101
14 days ago
Sierpiński Triangle
RedzGoose
124
14 days ago
Seven Segment
Mabeloid
167
15 days ago
Pangram Grep
RedzGoose
105
15 days ago
Cubes
RedzGoose
220
15 days ago
Niven Numbers (Long)
RedzGoose
74
15 days ago
99 Bottles of Beer
RedzGoose
332
15 days ago
Abundant Numbers (Long)
RedzGoose
78
15 days ago
Abundant Numbers
RedzGoose
74
15 days ago
12 Days of Christmas
RedzGoose
482
15 days ago
brainfuck
HumanoidCPU
312
17 days ago
Musical Chords
alemelis
409
18 days ago
Forsyth–Edwards Notation
bizy-coder
🥉
109
18 days ago
Arithmetic Numbers
RedzGoose
95
18 days ago
Niven Numbers
emgordon154
🥇
43
18 days ago
Arabic to Roman
CaedenHarper
183
19 days ago
Diamonds
CaedenHarper
134
19 days ago
Star Wars Opening Crawl
CaedenHarper
335
19 days ago
Fizz Buzz
aliakseikalosha
188
19 days ago
Prime Numbers
emgordon154
41
19 days ago
Levenshtein Distance
GrayJoKing
🥇
84
19 days ago