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
Continued Fractions
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
Multitap Input
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
Alphabetic Numbers
Apéry’s Constant
Binary Lambda Calculus
Connect Four
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
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Rectangle Fill
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
All Languages
><>
ALGOL 68
ArkScript
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
APL
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
Lily
Luau
Odin
Picat
Qore
Racket
Rebol
Rexx
Scala
Squirrel
Stax
Uiua
Umka
Vala
Vyxal
Bytes
Chars
Scoring
Bytes
Chars
Language
All
><>
ALGOL 68
ArkScript
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
APL
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
Lily
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
Continued Fractions
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
Multitap Input
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
Alphabetic Numbers
Apéry’s Constant
Binary Lambda Calculus
Connect Four
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
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Rectangle Fill
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
Hole
Golfer
Chars
Time
Submitted
Collatz
vyx77
110
61ms
18 days ago
Collatz
C32ardash
118
1,435ms
20 Feb 2026
Collatz
Shengxuan-Zhang
108
66ms
20 Feb 2026
Collatz
dokutan
96
64ms
8 Feb 2026
Collatz
emgordon154
97
56ms
8 Feb 2026
Collatz
Nwo5-trg
105
58ms
4 Feb 2026
Collatz
novaspaced
115
64ms
30 Jan 2026
Collatz
zzz13579zzz
104
59ms
29 Jan 2026
Collatz
samuel-thesing
109
1,321ms
28 Jan 2026
Collatz
IsGlitchy
351
1,378ms
29 Dec 2025
Collatz
AdrienHache
94
55ms
27 Dec 2025
Collatz
balloffur
110
452ms
23 Dec 2025
Collatz
kellantech
103
56ms
16 Dec 2025
Collatz
TheZwierzLF
120
1,430ms
13 Dec 2025
Collatz
eddienoon
127
63ms
23 Nov 2025
Collatz
6512345
108
67ms
8 Nov 2025
Collatz
Blockyheadman
109
69ms
6 Nov 2025
Collatz
Maximizer02
118
2,534ms
29 Oct 2025
Collatz
KasperKivimaeki
93
60ms
26 Oct 2025
Collatz
snoozingnewt
101
421ms
6 Oct 2025
Collatz
Yax42
98
61ms
4 Oct 2025
Collatz
CaedenHarper
107
62ms
28 Sep 2025
Collatz
matejmatik123
108
1,461ms
26 Sep 2025
Collatz
kmathis22
117
2,434ms
25 Sep 2025
Collatz
Arkadios200
121
1,440ms
21 Sep 2025
Collatz
timhaj
98
62ms
12 Sep 2025
Collatz
michaelmoynihan
101
442ms
3 Sep 2025
Collatz
CuboidRaptor
436
1,353ms
28 Aug 2025
Collatz
Ohh-n
114
58ms
9 Aug 2025
Collatz
gjoacorp
103
56ms
4 Aug 2025
Collatz
Bpc-CPU
113
71ms
11 Jul 2025
Collatz
fuzzylojik-golf
96
61ms
14 Jun 2025
Collatz
strogor
140
1,437ms
13 Jun 2025
Collatz
sean-niemann
93
59ms
9 Jun 2025
Collatz
PxL801
462
1,453ms
5 May 2025
Collatz
SamNew01
432
1,406ms
5 May 2025
Collatz
cuzdav
98
61ms
4 May 2025
Collatz
meh-mf
397
1,403ms
4 May 2025
Collatz
0dyse
115
62ms
23 Apr 2025
Collatz
heanyang1
117
67ms
20 Apr 2025
Collatz
ShinyHunter04
296
1,427ms
8 Apr 2025
Collatz
kevinnaviapaiva
208
1,384ms
6 Mar 2025
Collatz
snyderek
🥇
89
61ms
19 Feb 2025
Collatz
domi-s
135
1,381ms
9 Feb 2025
Collatz
erikji
112
420ms
4 Feb 2025
Collatz
yeminghan2021
99
58ms
3 Feb 2025
Collatz
ComputerKWasTaken
122
2,805ms
20 Jan 2025
Collatz
OiHarv
289
1,409ms
14 Dec 2024
Collatz
08jne01
116
62ms
21 Nov 2024
Collatz
jameswmccarty
148
64ms
24 Sep 2024
Collatz
rethaliate
130
62ms
21 Sep 2024
Collatz
Mabeloid
4,269
1,368ms
17 Sep 2024
Collatz
Santaclaus3dprints
134
1,351ms
10 Sep 2024
Collatz
BlankSpruce
96
62ms
20 Aug 2024
Collatz
ibrahimhanifceker
107
60ms
9 Aug 2024
Collatz
zygoloid
94
59ms
5 Aug 2024
Collatz
LHLaurini
104
58ms
30 Jul 2024
Collatz
OwenElliottDev
126
58ms
25 Jul 2024
Collatz
joseph-w0ng
153
1,343ms
5 Jul 2024
Collatz
bac0id
101
62ms
29 Jun 2024
Collatz
eMGeeneer
101
430ms
27 Jun 2024
Collatz
noahgitsham
125
1,360ms
20 Jun 2024
Collatz
elttil
107
58ms
12 Jun 2024
Collatz
ovs-code
92
58ms
3 Jun 2024
Collatz
tailorspy
93
56ms
27 May 2024
Collatz
HumanoidCPU
101
60ms
6 May 2024
Collatz
Alex-Huggett
153
1,329ms
14 Apr 2024
Collatz
tik25
148
1,383ms
28 Mar 2024
Collatz
KatieLG
4,281
1,456ms
23 Mar 2024
Collatz
Mandrzejy
95
61ms
22 Mar 2024
Collatz
trinityy-7
118
62ms
7 Mar 2024
Collatz
mathisfun271
156
62ms
19 Feb 2024
Collatz
oceko
98
62ms
19 Feb 2024
Collatz
NormalDoctor
125
61ms
10 Jan 2024
Collatz
kkoenig
96
57ms
21 Dec 2023
Collatz
AsbestosSniffer
118
1,381ms
3 Dec 2023
Collatz
4QT0R
92
52ms
23 Nov 2023
Collatz
roupiq
97
61ms
22 Nov 2023
Collatz
GolfGPT
126
1,362ms
19 Nov 2023
Collatz
MateuszPietrzak
96
60ms
18 Nov 2023