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
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
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
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
Lily
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
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
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
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
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
Bytes
Time
Submitted
Collatz
SectorCorruptor
88
22ms
16 hours ago
Collatz
HunterC14
93
26ms
25 hours ago
Collatz
bpharaldsson
73
20ms
4 days ago
Collatz
Kinkade76
83
26ms
6 days ago
Collatz
JOrE20
72
18ms
8 days ago
Collatz
netfri25
74
20ms
10 days ago
Collatz
matricronia
76
27ms
13 days ago
Collatz
samuel-thesing
78
26ms
13 days ago
Collatz
skaravind
78
20ms
22 days ago
Collatz
JesseNoEyes
79
19ms
26 days ago
Collatz
zacharysfrazee
73
21ms
11 Jan 2026
Collatz
77Tigers
74
23ms
8 Jan 2026
Collatz
CommandLeo
71
23ms
8 Jan 2026
Collatz
averagepythondev
3,238
11ms
2 Jan 2026
Collatz
Seek64
69
18ms
26 Dec 2025
Collatz
benanlam
84
20ms
24 Dec 2025
Collatz
enigma
75
33ms
21 Dec 2025
Collatz
AdrienHache
75
19ms
20 Dec 2025
Collatz
zgialor-lab
74
18ms
17 Dec 2025
Collatz
yoikolover
76
25ms
11 Dec 2025
Collatz
Lv0Sys
73
25ms
7 Dec 2025
Collatz
snoozingnewt
72
25ms
6 Dec 2025
Collatz
Languag3
71
25ms
5 Dec 2025
Collatz
bricknellj
69
17ms
4 Dec 2025
Collatz
duckyluuk
69
19ms
4 Dec 2025
Collatz
NoneTheFewer
90
24ms
4 Dec 2025
Collatz
bzijlema
70
20ms
3 Dec 2025
Collatz
tomh1012
79
23ms
3 Dec 2025
Collatz
ottav14
84
21ms
1 Dec 2025
Collatz
Andrey2001
86
27ms
27 Nov 2025
Collatz
blaztoma
71
24ms
25 Nov 2025
Collatz
hellopir2
70
27ms
23 Nov 2025
Collatz
bizy-coder
69
18ms
21 Nov 2025
Collatz
mmoffitt
75
26ms
19 Nov 2025
Collatz
09cf
71
19ms
18 Nov 2025
Collatz
JayXon
🥈
66
1,346ms
18 Nov 2025
Collatz
o800
94
20ms
17 Nov 2025
Collatz
j-zhang43
77
25ms
17 Nov 2025
Collatz
NicoBliss
102
23ms
16 Nov 2025
Collatz
commandz0
70
25ms
16 Nov 2025
Collatz
khvdm
💎
63
2,774ms
16 Nov 2025
Collatz
Aquateraneal
87
20ms
13 Nov 2025
Collatz
Tristanchaang
80
22ms
13 Nov 2025
Collatz
Mukundan314
69
19ms
13 Nov 2025
Collatz
jacekwladzinski
82
24ms
12 Nov 2025
Collatz
CarterStroik
108
21ms
12 Nov 2025
Collatz
Hyperoplex145
98
21ms
11 Nov 2025
Collatz
Laellekoenig
186
16ms
7 Nov 2025
Collatz
Babafaba
70
20ms
7 Nov 2025
Collatz
luuumine
70
20ms
3 Nov 2025
Collatz
Nikinator2704
75
18ms
1 Nov 2025
Collatz
fvla
74
32ms
31 Oct 2025
Collatz
MinecraftFan69420
101
21ms
31 Oct 2025
Collatz
ryyyn
70
21ms
29 Oct 2025
Collatz
ThomasDelepine
95
21ms
29 Oct 2025
Collatz
DrakeSeteraO
76
53ms
24 Oct 2025
Collatz
rustykitty
83
21ms
24 Oct 2025
Collatz
mathieurodic
76
36ms
21 Oct 2025
Collatz
EthanPatel01000101
116
17ms
20 Oct 2025
Collatz
TransformLikeATensor
79
19ms
16 Oct 2025
Collatz
Code-Coder-coder
74
19ms
12 Oct 2025
Collatz
TJK-S
92
20ms
10 Oct 2025
Collatz
solisolu
74
23ms
4 Oct 2025
Collatz
Mr-McChicken
90
18ms
4 Oct 2025
Collatz
retrohun
74
20ms
3 Oct 2025
Collatz
joll05
74
24ms
1 Oct 2025
Collatz
BrunoVisnadi
69
25ms
1 Oct 2025
Collatz
miaoaixuan
73
22ms
30 Sep 2025
Collatz
FortuiteMan
73
21ms
28 Sep 2025
Collatz
pauljoohyunkim
74
18ms
25 Sep 2025
Collatz
HETHAT
71
25ms
23 Sep 2025
Collatz
intgrah
70
20ms
23 Sep 2025
Collatz
Arkadios200
86
26ms
21 Sep 2025
Collatz
davidludwik2370
88
19ms
14 Sep 2025
Collatz
Matter1024
74
27ms
11 Sep 2025
Collatz
kmathis22
85
20ms
10 Sep 2025
Collatz
edsrzf
74
20ms
10 Sep 2025
Collatz
KapelMeister
150
15ms
5 Sep 2025
Collatz
imoxyg
80
25ms
29 Aug 2025
Collatz
arjunarya1
92
16ms
28 Aug 2025