Recent Solutions
Prev Hole
Play Hole
Next Hole
Achievements
Cheevos
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
Calendar
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
Tower of Hanoi
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
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
Multitap Input
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
All Languages
><>
Assembly
AWK
Bash
BASIC
Berry
brainfuck
C
C#
C++
Civet
Clojure
COBOL
Coconut
Common Lisp
Crystal
D
Dart
Elixir
Erlang
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
ArkScript
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
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
Erlang
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
ArkScript
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
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
Calendar
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
Tower of Hanoi
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
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
Multitap Input
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
Hole
Golfer
Chars
Time
Submitted
Gray Code Decoder
error256
98
158ms
3 days ago
Gray Code Decoder
error256
80
420ms
3 days ago
Gray Code Decoder
IanUtley
87
2,918ms
4 days ago
Gray Code Decoder
sean-niemann
62
365ms
4 days ago
Gray Code Decoder
sean-niemann
58
156ms
4 days ago
Gray Code Decoder
sean-niemann
51
38ms
4 days ago
Gray Code Decoder
error256
50
4,591ms
5 days ago
Gray Code Decoder
error256
44
1,181ms
5 days ago
Gray Code Decoder
error256
70
141ms
5 days ago
Gray Code Decoder
albanian-laundromat
135
44ms
5 days ago
Gray Code Decoder
error256
64
4,441ms
5 days ago
Gray Code Decoder
GolfingSuccess
71
18ms
5 days ago
Gray Code Decoder
kg583
47
11ms
5 days ago
Gray Code Decoder
kg583
56
8ms
5 days ago
Gray Code Decoder
GolfingSuccess
56
8ms
5 days ago
Gray Code Decoder
GolfingSuccess
69
394ms
5 days ago
Gray Code Decoder
error256
87
2,932ms
5 days ago
Gray Code Decoder
GolfingSuccess
88
993ms
5 days ago
Gray Code Decoder
GolfingSuccess
91
272ms
5 days ago
Gray Code Decoder
error256
91
293ms
5 days ago
Gray Code Decoder
GolfingSuccess
85
25ms
6 days ago
Gray Code Decoder
GolfingSuccess
28
32ms
6 days ago
Gray Code Decoder
error256
49
276ms
6 days ago
Gray Code Decoder
error256
59
68ms
6 days ago
Gray Code Decoder
ovs-code
38
42ms
6 days ago
Gray Code Decoder
aksyristos
82
19ms
7 days ago
Gray Code Decoder
error256
35
86ms
7 days ago
Gray Code Decoder
error256
30
26ms
7 days ago
Gray Code Decoder
error256
72
21ms
7 days ago
Gray Code Decoder
error256
83
367ms
7 days ago
Gray Code Decoder
error256
74
3ms
7 days ago
Gray Code Decoder
error256
91
62ms
7 days ago
Gray Code Decoder
GolfingSuccess
65
92ms
7 days ago
Gray Code Decoder
GolfingSuccess
59
165ms
7 days ago
Gray Code Decoder
GolfingSuccess
63
7ms
7 days ago
Gray Code Decoder
GolfingSuccess
49
36ms
7 days ago
Gray Code Decoder
GolfingSuccess
71
57ms
7 days ago
Gray Code Decoder
GolfingSuccess
66
10ms
7 days ago
Gray Code Decoder
GolfingSuccess
89
61ms
7 days ago
Gray Code Decoder
GolfingSuccess
71
4ms
7 days ago
Gray Code Decoder
GolfingSuccess
83
367ms
7 days ago
Gray Code Decoder
GolfingSuccess
51
37ms
7 days ago
Gray Code Decoder
GolfingSuccess
13
4ms
7 days ago
Gray Code Decoder
GolfingSuccess
117
258ms
8 days ago
Gray Code Decoder
albanian-laundromat
28
32ms
8 days ago
Gray Code Decoder
GolfingSuccess
18
90ms
8 days ago
Gray Code Decoder
GolfingSuccess
83
111ms
8 days ago
Gray Code Decoder
GolfingSuccess
75
18ms
8 days ago
Gray Code Decoder
GolfingSuccess
60
381ms
8 days ago
Gray Code Decoder
IISResetMe
73
256ms
10 days ago
Gray Code Decoder
albanian-laundromat
75
400ms
13 days ago
Gray Code Decoder
AdrienHache
66
426ms
13 days ago
Gray Code Decoder
albanian-laundromat
95
119ms
13 days ago
Gray Code Decoder
albanian-laundromat
55
2,221ms
13 days ago
Gray Code Decoder
albanian-laundromat
207
1,546ms
13 days ago
Gray Code Decoder
Yax42
66
398ms
14 days ago
Gray Code Decoder
albanian-laundromat
47
1,049ms
15 days ago
Gray Code Decoder
albanian-laundromat
108
30ms
15 days ago
Gray Code Decoder
albanian-laundromat
75
103ms
15 days ago
Gray Code Decoder
albanian-laundromat
88
1,544ms
15 days ago
Gray Code Decoder
albanian-laundromat
122
255ms
15 days ago
Gray Code Decoder
albanian-laundromat
54
11ms
16 days ago
Gray Code Decoder
voytxt
61
27ms
19 days ago
Gray Code Decoder
JOrE20
75
17ms
26 days ago
Gray Code Decoder
DialFrost
48
55ms
16 Dec 2025
Gray Code Decoder
JOrE20
100
41ms
15 Dec 2025
Gray Code Decoder
ovs-code
91
261ms
13 Dec 2025
Gray Code Decoder
albanian-laundromat
84
9ms
11 Dec 2025
Gray Code Decoder
albanian-laundromat
121
78ms
9 Dec 2025
Gray Code Decoder
albanian-laundromat
265
50ms
8 Dec 2025
Gray Code Decoder
bitsandbeyond
44
1,172ms
8 Dec 2025
Gray Code Decoder
ovs-code
27
5ms
7 Dec 2025
Gray Code Decoder
albanian-laundromat
63
12ms
7 Dec 2025
Gray Code Decoder
albanian-laundromat
77
366ms
6 Dec 2025
Gray Code Decoder
albanian-laundromat
69
506ms
6 Dec 2025
Gray Code Decoder
albanian-laundromat
85
92ms
6 Dec 2025
Gray Code Decoder
albanian-laundromat
53
763ms
6 Dec 2025
Gray Code Decoder
albanian-laundromat
65
42ms
6 Dec 2025
Gray Code Decoder
albanian-laundromat
97
44ms
6 Dec 2025
Gray Code Decoder
albanian-laundromat
96
5ms
6 Dec 2025