Recent Solutions
Prev Hole
Play Hole
Next Hole
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
Billiards
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
Hilbert Curve
Intersection
Inventory Sequence
ISBN
Jacobi Symbol
Kaprekar Numbers
Kolakoski Constant
Kolakoski Sequence
Leap Years
Levenshtein Distance
Leyland Numbers
ln 2
Look and Say
Lucky Numbers
Lucky Tickets
Mahjong
Mandelbrot
Maze
Medal Tally
Minesweeper
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
Partition Numbers
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
ROT13
Rule 110
Scrambled Sort
Set
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars GPT
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Tic-tac-toe
Time Distance
Tongue-twisters
Topological Sort
Transpose Sentence
Trinomial Triangle
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Apéry’s Constant
Binary Lambda Calculus
Calendar
Connect Four
Continued Fractions
Crossword
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
NFA Simulator
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Tower of Hanoi
Turtle
Tutorial
All Languages
><>
Assembly
AWK
Bash
BASIC
Berry
brainfuck
C
C#
C++
Civet
Clojure
COBOL
Coconut
Common Lisp
Crystal
D
Dart
Elixir
F#
Factor
Forth
Fortran
Gleam
Go
GolfScript
Groovy
Haskell
Hexagony
J
Janet
Java
JavaScript
jq
Julia
K
Kotlin
Lua
Nim
OCaml
Pascal
Perl
PHP
PowerShell
Prolog
Python
R
Raku
Rockstar
Ruby
Rust
Scheme
sed
SQL
Swift
Tcl
TeX
V
VimL
Wren
Zig
05AB1E
ALGOL 68
APL
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Erlang
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
Luau
Odin
Picat
Qore
Racket
Rebol
Rexx
Scala
Squirrel
Stax
Uiua
Umka
Vala
Vyxal
Bytes
Chars
Scoring
Bytes
Chars
Language
All
><>
Assembly
AWK
Bash
BASIC
Berry
brainfuck
C
C#
C++
Civet
Clojure
COBOL
Coconut
Common Lisp
Crystal
D
Dart
Elixir
F#
Factor
Forth
Fortran
Gleam
Go
GolfScript
Groovy
Haskell
Hexagony
J
Janet
Java
JavaScript
jq
Julia
K
Kotlin
Lua
Nim
OCaml
Pascal
Perl
PHP
PowerShell
Prolog
Python
R
Raku
Rockstar
Ruby
Rust
Scheme
sed
SQL
Swift
Tcl
TeX
V
VimL
Wren
Zig
Experimental Language
05AB1E
ALGOL 68
APL
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Erlang
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
Luau
Odin
Picat
Qore
Racket
Rebol
Rexx
Scala
Squirrel
Stax
Uiua
Umka
Vala
Vyxal
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
Billiards
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
Hilbert Curve
Intersection
Inventory Sequence
ISBN
Jacobi Symbol
Kaprekar Numbers
Kolakoski Constant
Kolakoski Sequence
Leap Years
Levenshtein Distance
Leyland Numbers
ln 2
Look and Say
Lucky Numbers
Lucky Tickets
Mahjong
Mandelbrot
Maze
Medal Tally
Minesweeper
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
Partition Numbers
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
ROT13
Rule 110
Scrambled Sort
Set
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars GPT
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Tic-tac-toe
Time Distance
Tongue-twisters
Topological Sort
Transpose Sentence
Trinomial Triangle
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Experimental Hole
Apéry’s Constant
Binary Lambda Calculus
Calendar
Connect Four
Continued Fractions
Crossword
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
NFA Simulator
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Tower of Hanoi
Turtle
Tutorial
Hole
Golfer
Chars
Time
Submitted
Kolakoski Constant
alexsave
107
22ms
4 days ago
Kolakoski Constant
CaedenHarper
839
8ms
13 days ago
Kolakoski Constant
JOrE20
839
9ms
13 days ago
Kolakoski Constant
snoozingnewt
368
11ms
5 Oct 2025
Kolakoski Constant
KatieLG
118
17ms
5 Oct 2025
Kolakoski Constant
olleicua
1,009
9ms
11 Sep 2025
Kolakoski Constant
acollett89
1,011
9ms
31 Jul 2025
Kolakoski Constant
gigaprofisi
1,009
9ms
21 Jun 2025
Kolakoski Constant
targrik
229
9ms
14 Mar 2025
Kolakoski Constant
smclaughlin-cf
336
15ms
4 Mar 2025
Kolakoski Constant
emgordon154
92
11ms
4 Mar 2025
Kolakoski Constant
roguh
842
9ms
13 Oct 2024
Kolakoski Constant
helbling
93
14ms
2 Oct 2024
Kolakoski Constant
pardouin
86
29ms
27 Sep 2024
Kolakoski Constant
Mabeloid
1,011
8ms
20 Sep 2024
Kolakoski Constant
ovs-code
81
11ms
4 Aug 2024
Kolakoski Constant
sean-niemann
79
25ms
3 Aug 2024
Kolakoski Constant
dokutan
362
11ms
3 Aug 2024
Kolakoski Constant
rucin93
79
26ms
22 Jul 2024
Kolakoski Constant
bac0id
336
14ms
26 Jun 2024
Kolakoski Constant
hacker112
355
10ms
22 Jun 2024
Kolakoski Constant
vlpx
🥈
75
16ms
18 Jun 2024
Kolakoski Constant
MeWhenI
83
11ms
7 Jun 2024
Kolakoski Constant
HumanoidCPU
417
12ms
20 Apr 2024
Kolakoski Constant
trinityy-7
1,009
8ms
14 Mar 2024
Kolakoski Constant
two-bad
141
874ms
25 Feb 2024
Kolakoski Constant
MarcMush
1,011
9ms
3 Feb 2024
Kolakoski Constant
madeforlosers
417
12ms
11 Jan 2024
Kolakoski Constant
coreynash
131
32ms
24 Oct 2023
Kolakoski Constant
stefangimmillaro
81
11ms
26 Sep 2023
Kolakoski Constant
Argeento
92
10ms
26 Aug 2023
Kolakoski Constant
emplv
🥈
75
12ms
27 Jul 2023
Kolakoski Constant
Yewzir
215
9ms
7 Jul 2023
Kolakoski Constant
jmerle
417
13ms
2 Jul 2023
Kolakoski Constant
zakariamouhid
199
60ms
24 Jun 2023
Kolakoski Constant
nwellnhof
77
10ms
29 May 2023
Kolakoski Constant
adamnielson42
194
20ms
25 Apr 2023
Kolakoski Constant
hacker19374
1,009
9ms
10 Mar 2023
Kolakoski Constant
AlephSquirrel
93
12ms
16 Feb 2023
Kolakoski Constant
tayloia
86
10ms
17 Jan 2023
Kolakoski Constant
retrohun
1,011
9ms
27 Dec 2022
Kolakoski Constant
CatsAreFluffy
365
15ms
18 Dec 2022
Kolakoski Constant
GeorgeStechman
117
17ms
17 Nov 2022
Kolakoski Constant
eranws
150
48ms
2 Nov 2022
Kolakoski Constant
itsh01
88
13ms
14 Sep 2022
Kolakoski Constant
KatieLG-Transpiler
1,011
9ms
23 Jun 2022
Kolakoski Constant
dmrichwa
88
16ms
9 Jun 2022
Kolakoski Constant
otubby
1,011
8ms
30 Mar 2022
Kolakoski Constant
jared-hughes
104
12ms
14 Mar 2022
Kolakoski Constant
gnlow
846
9ms
27 Jan 2022
Kolakoski Constant
voytxt
1,009
9ms
25 Jan 2022
Kolakoski Constant
wansacis
1,011
9ms
10 Dec 2021
Kolakoski Constant
mokymok
1,011
12ms
15 Nov 2021
Kolakoski Constant
NewDefectus
83
11ms
1 Nov 2021
Kolakoski Constant
SpareManiKatti
1,009
10ms
14 Oct 2021
Kolakoski Constant
Irratix
🥈
75
13ms
28 Aug 2021
Kolakoski Constant
Waffle3z
1,009
9ms
14 Aug 2021
Kolakoski Constant
theunofficialcoder
1,011
9ms
8 Aug 2021
Kolakoski Constant
janbehrens
96
43ms
1 Aug 2021
Kolakoski Constant
JayXon
💎
72
20ms
20 Jul 2021
Kolakoski Constant
shaunjc
1,011
9ms
10 Jun 2021
Kolakoski Constant
pbarath
1,011
9ms
7 Jun 2021
Kolakoski Constant
Shanethegamer
99
11ms
1 Jun 2021
Kolakoski Constant
aphrim
1,011
8ms
18 May 2021
Kolakoski Constant
didion0
113
49ms
6 May 2021
Kolakoski Constant
mothcolada
1,011
9ms
1 Apr 2021
Kolakoski Constant
neihousaigaai
1,009
9ms
1 Apr 2021
Kolakoski Constant
ArmaanAS
316
9ms
30 Mar 2021
Kolakoski Constant
primo-ppcg
79
12ms
18 Mar 2021
Kolakoski Constant
boxjelly
1,011
11ms
15 Feb 2021
Kolakoski Constant
BBoehm
839
9ms
14 Feb 2021
Kolakoski Constant
prplz
89
9ms
8 Feb 2021
Kolakoski Constant
tomtheisen
85
11ms
19 Jan 2021
Kolakoski Constant
Omega65536
229
8ms
17 Jan 2021