The
Kaprekar Numbers
hole will go live in
21 hours
. 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
Fractions
HumanoidCPU
86
2 hours ago
Emirp Numbers (Long)
inventshah
93
5 hours ago
24 Game
marcus-gomes-v
408
9 hours ago
Fibonacci
griffinschreiber
56
10 hours ago
Niven Numbers (Long)
JesseNoEyes
93
16 hours ago
Happy Numbers (Long)
goodwyna21
116
a day ago
Smith Numbers
alexsave
135
a day ago
Leyland Numbers
alexsave
99
a day ago
Evil Numbers (Long)
goodwyna21
52
a day ago
Evil Numbers
goodwyna21
51
a day ago
Abundant Numbers
goodwyna21
58
a day ago
Odious Numbers
goodwyna21
53
a day ago
Emojify
alexsave
247
a day ago
Ascending Primes
alexsave
101
a day ago
Prime Numbers
alexsave
55
a day ago
Christmas Trees
Shanethegamer
82
a day ago
Transpose Sentence
alexsave
97
a day ago
PalindromemordnilaP
HumanoidCPU
95
2 days ago
Card Number Validation
sean-niemann
69
2 days ago
99 Bottles of Beer
boomersplayground
490
2 days ago
Fizz Buzz
Maximizer02
74
2 days ago
Card Number Validation
alexsave
90
3 days ago
Divisors
ErikGXDev
62
3 days ago
Divisors
lafkpages
74
3 days ago
Evil Numbers
Andrey-Plotnikov
63
3 days ago
Odious Numbers
Andrey-Plotnikov
59
3 days ago
Rock-paper-scissors-Spock-lizard
Andrey-Plotnikov
205
3 days ago
π
Andrey-Plotnikov
184
3 days ago
Diamonds
Mabeloid
112
4 days ago
ASCII Table
Mabeloid
159
4 days ago
Fizz Buzz
Hagriel
65
4 days ago
Farey Sequence
dokutan
112
4 days ago
Fizz Buzz
ErikGXDev
🥇
56
4 days ago
Fibonacci
ErikGXDev
55
4 days ago
Abundant Numbers
ErikGXDev
57
4 days ago
Fractions
lafkpages
94
4 days ago
ASCII Table
lafkpages
164
4 days ago
Abundant Numbers
lafkpages
64
4 days ago
Levenshtein Distance
edsrzf
129
5 days ago
Number Spiral
KatieLG
188
5 days ago
ASCII Table
Andrey-Plotnikov
218
5 days ago
Catalan’s Constant
KatieLG
151
5 days ago
π
TheRealOhead
170
5 days ago
Arabic to Roman
Andrey-Plotnikov
141
5 days ago
Leyland Numbers
goodwyna21
108
6 days ago
Mahjong
helbling
262
6 days ago
Prime Numbers
goodwyna21
71
6 days ago
Niven Numbers (Long)
goodwyna21
68
6 days ago
Abundant Numbers (Long)
Andrey-Plotnikov
61
6 days ago
Card Number Validation
GeorgeStechman
87
6 days ago
Emojify
lukegustafson
💎
139
6 days ago
Pernicious Numbers
Andrey-Plotnikov
69
6 days ago
Card Number Validation
rucin93
🥇
68
6 days ago
Card Number Validation
emplv
🥇
68
6 days ago
N Queens
olleicua
157
6 days ago
Fizz Buzz
Andrey-Plotnikov
58
7 days ago
Foo Fizz Buzz Bar
Andrey-Plotnikov
89
7 days ago
Transpose Sentence
uttumuttu
83
7 days ago
24 Game
mamamia5x
12,440
7 days ago
Foo Fizz Buzz Bar
madeforlosers
91
7 days ago
Happy Numbers
madeforlosers
79
7 days ago
Prime Numbers (Long)
madeforlosers
43
7 days ago
PalindromemordnilaP
madeforlosers
106
7 days ago
Farey Sequence
madeforlosers
95
7 days ago
Jacobi Symbol
madeforlosers
151
7 days ago
Arabic to Roman
madeforlosers
175
7 days ago
Sudoku
madeforlosers
625
7 days ago
Happy Numbers (Long)
madeforlosers
125
7 days ago
Time Distance
madeforlosers
399
7 days ago
Rule 110
madeforlosers
174
7 days ago
Pernicious Numbers (Long)
madeforlosers
118
7 days ago
Vampire Numbers
madeforlosers
292
7 days ago
Morse Decoder
madeforlosers
360
7 days ago
Reverse Polish Notation
madeforlosers
238
7 days ago
Pascal’s Triangle
madeforlosers
148
7 days ago