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
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
Maze
Medal Tally
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
Set
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Tic-tac-toe
Time Distance
Tongue-twisters
Transpose Sentence
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Apéry’s Constant
Calendar
Connect Four
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
Hilbert Curve
Mandelbrot
Minesweeper
NFA Simulator
Odd Polyomino Tiling
p-adic Expansion
QR Encoder
Quadratic Formula
Scrambled Alphabetization
Semiprime Numbers
Snake
Sphenic Numbers
Star Wars GPT
Trinomial Triangle
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
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
Groovy
Harbour
Hare
Haxe
Hush
Hy
iogii
Odin
Picat
Qore
Racket
Rebol
Rexx
Scala
Squirrel
Stax
Uiua
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
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
Groovy
Harbour
Hare
Haxe
Hush
Hy
iogii
Odin
Picat
Qore
Racket
Rebol
Rexx
Scala
Squirrel
Stax
Uiua
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
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
Maze
Medal Tally
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
Set
Seven Segment
SI Units
Sierpiński Triangle
Smith Numbers
Spelling Numbers
Star Wars Opening Crawl
Sudoku
Sudoku (Fill-in)
Ten-pin Bowling
Tic-tac-toe
Time Distance
Tongue-twisters
Transpose Sentence
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Experimental Hole
Apéry’s Constant
Calendar
Connect Four
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
Hilbert Curve
Mandelbrot
Minesweeper
NFA Simulator
Odd Polyomino Tiling
p-adic Expansion
QR Encoder
Quadratic Formula
Scrambled Alphabetization
Semiprime Numbers
Snake
Sphenic Numbers
Star Wars GPT
Trinomial Triangle
Turtle
Tutorial
Hole
Golfer
Bytes
Submitted
Collatz
jipsong
72
6 mins ago
Collatz
albanian-laundromat
74
18 hours ago
Collatz
TannerJ07
109
18 hours ago
Collatz
apurbapokharel
234
25 hours ago
Collatz
sulphemi
72
26 hours ago
Collatz
RJFuller
3,238
34 hours ago
Collatz
Mukundan314
70
37 hours ago
Collatz
dokutan
154
43 hours ago
Collatz
JulieGermainUNT
102
2 days ago
Collatz
griffinschreiber
94
2 days ago
Collatz
Hemanthred2005
86
2 days ago
Collatz
jj0786-cell
94
2 days ago
Collatz
amritm55
228
3 days ago
Collatz
jejuan05
450
3 days ago
Collatz
AsishKunta
86
3 days ago
Collatz
tophy6
246
3 days ago
Collatz
jeff-re
96
3 days ago
Collatz
Zok030
243
3 days ago
Collatz
Hailee100
314
3 days ago
Collatz
letdank
247
3 days ago
Collatz
CosmicRaichu
111
3 days ago
Collatz
souta-1326
73
3 days ago
Collatz
KevinMarquette
52
4 days ago
Collatz
Chinay-Domitrix
149
6 days ago
Collatz
Chinay-Domitrix
88
6 days ago
Collatz
DialFrost
🥇
142
7 days ago
Collatz
rucin93
158
7 days ago
Collatz
MeWhenI
145
7 days ago
Collatz
yujh-yujh
69
7 days ago
Collatz
Shanethegamer
🥇
142
7 days ago
Collatz
ovs-code
150
7 days ago
Collatz
Pyroan
74
8 days ago
Collatz
yoshykai
129
8 days ago
Collatz
KasperKivimaeki
71
8 days ago
Collatz
heanyang1
77
8 days ago
Collatz
calum12345
164
8 days ago
Collatz
dokutan
104
9 days ago
Collatz
calum12345
103
9 days ago
Collatz
plcc0
69
9 days ago
Collatz
ehulinsky
94
9 days ago
Collatz
Natanaelel
18
11 days ago
Collatz
AntoineBlondon
199
12 days ago
Collatz
acotis
🥉
91
12 days ago
Collatz
rustykitty
88
12 days ago
Collatz
2bular
18
12 days ago
Collatz
AlephSquirrel
107
14 days ago
Collatz
dokutan
79
14 days ago
Collatz
dokutan
95
14 days ago
Collatz
plcc0
29
15 days ago
Collatz
GolfingSuccess
36
15 days ago
Collatz
dokutan
74
17 days ago
Collatz
OyuDays
83
17 days ago
Collatz
retrohun
4,348
18 days ago
Collatz
Blendi-Goose
72
18 days ago
Collatz
DialFrost
29
19 days ago
Collatz
kTheLemon
93
19 days ago
Collatz
komunre
194
20 days ago
Collatz
stackofbears
🥈
38
20 days ago
Collatz
WillowWispy
84
21 days ago
Collatz
ovs-code
55
21 days ago
Collatz
DialFrost
115
22 days ago
Collatz
LostSyntax21
54
22 days ago
Collatz
dokutan
78
23 days ago
Collatz
DialFrost
86
25 days ago
Collatz
retrohun
3,260
26 days ago
Collatz
HumanoidCPU
5,225
26 days ago
Collatz
sean-niemann
🥈
42
26 days ago
Collatz
sean-niemann
60
7 Mar 2025
Collatz
sean-niemann
🥇
67
7 Mar 2025
Collatz
sean-niemann
72
7 Mar 2025
Collatz
sean-niemann
69
7 Mar 2025
Collatz
sean-niemann
51
7 Mar 2025
Collatz
kevinnaviapaiva
208
6 Mar 2025
Collatz
kevinnaviapaiva
163
6 Mar 2025
Collatz
kevinnaviapaiva
215
6 Mar 2025