The
Kaprekar Numbers
hole will go live in
2 days
. Why not try and solve it ahead of time?
Recent Solutions
Golfers
Solutions
All Holes
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
All Languages
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AWK
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brainfuck
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Dart
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Bytes
Chars
Language
All
><>
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
Tongue-twisters
edsrzf
384
an hour ago
N Queens
edsrzf
💎
134
10 hours ago
Game of Life
edsrzf
🥈
134
10 hours ago
Farey Sequence
dokutan
188
23 hours ago
Time Distance
edsrzf
🥈
306
a day ago
π
m4xxh
1,011
a day ago
Day of Week
edsrzf
140
2 days ago
CSS Colors
edsrzf
💎
848
2 days ago
Poker
edsrzf
💎
471
3 days ago
Collatz
edsrzf
78
3 days ago
Intersection
edsrzf
🥉
135
3 days ago
Reverse Polish Notation
edsrzf
111
4 days ago
Quine
edsrzf
34
6 days ago
PalindromemordnilaP
edsrzf
🥈
131
6 days ago
Cubes
edsrzf
🥉
328
6 days ago
Leap Years
edsrzf
55
6 days ago
Look and Say
edsrzf
95
6 days ago
Rijndael S-box
edsrzf
🥈
314
7 days ago
Medal Tally
edsrzf
🥉
182
7 days ago
Arrows
edsrzf
250
7 days ago
Pangram Grep
edsrzf
83
8 days ago
Forsyth–Edwards Notation
edsrzf
177
8 days ago
Emojify
edsrzf
💎
160
8 days ago
Ordinal Numbers
edsrzf
💎
91
8 days ago
brainfuck
edsrzf
🥉
170
8 days ago
Rule 110
edsrzf
🥈
138
8 days ago
Day of Week
dokutan
233
8 days ago
Lucky Tickets
Shanethegamer
🥈
202
8 days ago
Rock-paper-scissors-Spock-lizard
edsrzf
🥈
265
9 days ago
Star Wars Opening Crawl
dokutan
💎
5,354
10 days ago
Sierpiński Triangle
Shanethegamer
95
10 days ago
Odious Numbers (Long)
Shanethegamer
70
10 days ago
Evil Numbers (Long)
Shanethegamer
71
10 days ago
Forsyth–Edwards Notation
Shanethegamer
🥉
173
10 days ago
Game of Life
Shanethegamer
💎
129
10 days ago
United States
Shanethegamer
🥉
693
11 days ago
Emojify
Shanethegamer
🥉
316
11 days ago
United States
edsrzf
💎
189
11 days ago
Tongue-twisters
dokutan
🥉
381
13 days ago
Polyominoes
dokutan
🥈
1,162
13 days ago
Fizz Buzz
aliakseikalosha
100
15 days ago
Hexdump
KatieLG
🥉
6,156
16 days ago
Fizz Buzz
snoozingnewt
106
18 days ago
Sierpiński Triangle
dokutan
220
22 days ago
Van Eck Sequence
dokutan
1,493
22 days ago
Rijndael S-box
dokutan
731
22 days ago
Pascal’s Triangle
dokutan
692
22 days ago
Look and Say
dokutan
623
22 days ago
Kolakoski Sequence
dokutan
300
22 days ago
Inventory Sequence
dokutan
1,509
22 days ago
Factorial Factorisation
dokutan
🥉
750
22 days ago
24 Game
dokutan
🥈
4,677
22 days ago
Rule 110
dokutan
1,779
23 days ago
Gijswijt’s Sequence
dokutan
175
23 days ago
Arabic to Roman
Shanethegamer
🥉
172
24 days ago
Proximity Grid
KatieLG
3,550
24 days ago
Star Wars Opening Crawl
KatieLG
🥉
9,636
24 days ago
Levenshtein Distance
edsrzf
🥇
172
24 days ago
Fractions
Shanethegamer
🥈
99
24 days ago
CSS Colors
Shanethegamer
🥈
973
25 days ago
Gijswijt’s Sequence
Mabeloid
3,007
25 days ago
Number Spiral
Mabeloid
317
25 days ago
Prime Numbers
Mabeloid
103
25 days ago
Prime Numbers (Long)
Mabeloid
7,184
25 days ago
12 Days of Christmas
dokutan
502
25 days ago
Pernicious Numbers
Mabeloid
142
25 days ago
Pernicious Numbers (Long)
Mabeloid
24,921
25 days ago
Pascal’s Triangle
Mabeloid
796
25 days ago
Inventory Sequence
Mabeloid
3,630
25 days ago
Recamán
Mabeloid
1,154
26 days ago
Van Eck Sequence
Mabeloid
3,562
26 days ago
Cubes
Mabeloid
4,219
26 days ago
Arithmetic Numbers
Mabeloid
45,337
26 days ago
Card Number Validation
Shanethegamer
💎
101
27 days ago
Fizz Buzz
alemelis
89
27 days ago