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
Gray Code Decoder
Gray Code Encoder
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
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
Gray Code Decoder
Gray Code Encoder
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
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
jusaka
3,274
1,772ms
28 hours ago
Collatz
CoderColby
107
1,384ms
3 days ago
Collatz
liamjermy6
98
61ms
8 days ago
Collatz
vyx77
110
63ms
2 Mar 2026
Collatz
C32ardash
118
1,427ms
20 Feb 2026
Collatz
Shengxuan-Zhang
108
64ms
20 Feb 2026
Collatz
dokutan
96
60ms
8 Feb 2026
Collatz
emgordon154
97
59ms
8 Feb 2026
Collatz
Nwo5-trg
105
62ms
4 Feb 2026
Collatz
novaspaced
115
76ms
30 Jan 2026
Collatz
zzz13579zzz
104
70ms
29 Jan 2026
Collatz
samuel-thesing
109
1,349ms
28 Jan 2026
Collatz
IsGlitchy
351
1,517ms
29 Dec 2025
Collatz
AdrienHache
94
57ms
27 Dec 2025
Collatz
balloffur
110
466ms
23 Dec 2025
Collatz
kellantech
103
59ms
16 Dec 2025
Collatz
TheZwierzLF
120
1,393ms
13 Dec 2025
Collatz
eddienoon
127
61ms
23 Nov 2025
Collatz
6512345
108
63ms
8 Nov 2025
Collatz
Blockyheadman
109
61ms
6 Nov 2025
Collatz
Maximizer02
118
2,458ms
29 Oct 2025
Collatz
KasperKivimaeki
93
56ms
26 Oct 2025
Collatz
snoozingnewt
101
434ms
6 Oct 2025
Collatz
Yax42
98
54ms
4 Oct 2025
Collatz
CaedenHarper
107
63ms
28 Sep 2025
Collatz
matejmatik123
108
1,343ms
26 Sep 2025
Collatz
kmathis22
117
2,495ms
25 Sep 2025
Collatz
Arkadios200
121
1,593ms
21 Sep 2025
Collatz
timhaj
98
65ms
12 Sep 2025
Collatz
michaelmoynihan
101
431ms
3 Sep 2025
Collatz
CuboidRaptor
436
1,378ms
28 Aug 2025
Collatz
Ohh-n
114
64ms
9 Aug 2025
Collatz
gjoacorp
103
60ms
4 Aug 2025
Collatz
Bpc-CPU
113
64ms
11 Jul 2025
Collatz
fuzzylojik-golf
96
60ms
14 Jun 2025
Collatz
strogor
140
1,329ms
13 Jun 2025
Collatz
sean-niemann
93
61ms
9 Jun 2025
Collatz
PxL801
462
1,513ms
5 May 2025
Collatz
SamNew01
432
1,371ms
5 May 2025
Collatz
cuzdav
98
63ms
4 May 2025
Collatz
meh-mf
397
1,414ms
4 May 2025
Collatz
0dyse
115
54ms
23 Apr 2025
Collatz
heanyang1
117
62ms
20 Apr 2025
Collatz
ShinyHunter04
296
1,359ms
8 Apr 2025
Collatz
kevinnaviapaiva
208
1,511ms
6 Mar 2025
Collatz
snyderek
🥇
89
62ms
19 Feb 2025
Collatz
domi-s
135
1,438ms
9 Feb 2025
Collatz
erikji
112
448ms
4 Feb 2025
Collatz
yeminghan2021
99
69ms
3 Feb 2025
Collatz
ComputerKWasTaken
122
2,963ms
20 Jan 2025
Collatz
OiHarv
289
1,413ms
14 Dec 2024
Collatz
08jne01
116
60ms
21 Nov 2024
Collatz
jameswmccarty
148
58ms
24 Sep 2024
Collatz
rethaliate
130
64ms
21 Sep 2024
Collatz
Mabeloid
4,269
1,361ms
17 Sep 2024
Collatz
Santaclaus3dprints
134
1,426ms
10 Sep 2024
Collatz
BlankSpruce
96
62ms
20 Aug 2024
Collatz
ibrahimhanifceker
107
56ms
9 Aug 2024
Collatz
zygoloid
94
59ms
5 Aug 2024
Collatz
LHLaurini
104
52ms
30 Jul 2024
Collatz
OwenElliottDev
126
59ms
25 Jul 2024
Collatz
joseph-w0ng
153
1,392ms
5 Jul 2024
Collatz
bac0id
101
61ms
29 Jun 2024
Collatz
eMGeeneer
101
415ms
27 Jun 2024
Collatz
noahgitsham
125
1,395ms
20 Jun 2024
Collatz
elttil
107
80ms
12 Jun 2024
Collatz
ovs-code
92
56ms
3 Jun 2024
Collatz
tailorspy
93
58ms
27 May 2024
Collatz
HumanoidCPU
101
56ms
6 May 2024
Collatz
Alex-Huggett
153
1,398ms
14 Apr 2024
Collatz
tik25
148
1,348ms
28 Mar 2024
Collatz
KatieLG
4,281
1,481ms
23 Mar 2024
Collatz
Mandrzejy
95
61ms
22 Mar 2024
Collatz
trinityy-7
118
57ms
7 Mar 2024
Collatz
mathisfun271
156
60ms
19 Feb 2024
Collatz
oceko
98
74ms
19 Feb 2024
Collatz
NormalDoctor
125
58ms
10 Jan 2024
Collatz
kkoenig
96
62ms
21 Dec 2023
Collatz
AsbestosSniffer
118
1,412ms
3 Dec 2023
Collatz
4QT0R
92
61ms
23 Nov 2023