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
Chars
Time
Submitted
Catalan’s Constant
Aquateraneal
203
713ms
43 hours ago
Catalan’s Constant
Andrey2001
1,011
10ms
14 days ago
Catalan’s Constant
ryyyn
103
34ms
17 days ago
Catalan’s Constant
JOrE20
1,011
10ms
6 Jan 2026
Catalan’s Constant
CommandLeo
141
44ms
6 Jan 2026
Catalan’s Constant
Lv0Sys
110
26ms
25 Dec 2025
Catalan’s Constant
madex
293
23ms
24 Dec 2025
Catalan’s Constant
YAJUE114514
87
40ms
12 Dec 2025
Catalan’s Constant
cros107
126
271ms
6 Dec 2025
Catalan’s Constant
bizy-coder
85
14ms
26 Nov 2025
Catalan’s Constant
JayXon
64
16ms
25 Nov 2025
Catalan’s Constant
Carlos-EAC
1,011
11ms
24 Nov 2025
Catalan’s Constant
CornerMercury
70
11ms
23 Nov 2025
Catalan’s Constant
TheZwierzLF
1,015
11ms
21 Nov 2025
Catalan’s Constant
TJK-S
430
79ms
2 Nov 2025
Catalan’s Constant
Babafaba
86
276ms
23 Oct 2025
Catalan’s Constant
luuumine
531
10ms
14 Oct 2025
Catalan’s Constant
blaztoma
157
68ms
5 Oct 2025
Catalan’s Constant
jacekwladzinski
322
50ms
4 Oct 2025
Catalan’s Constant
KatieLG
102
164ms
2 Oct 2025
Catalan’s Constant
qpwoeirut
121
33ms
2 Oct 2025
Catalan’s Constant
FortuiteMan
93
108ms
26 Sep 2025
Catalan’s Constant
snoozingnewt
300
12ms
26 Sep 2025
Catalan’s Constant
cthierfelder
1,011
10ms
8 Sep 2025
Catalan’s Constant
Emutis
670
10ms
7 Sep 2025
Catalan’s Constant
5cw
81
12ms
28 Aug 2025
Catalan’s Constant
robin-scragg
386
16ms
19 Aug 2025
Catalan’s Constant
InigoK
105
485ms
14 Aug 2025
Catalan’s Constant
CaedenHarper
113
77ms
13 Aug 2025
Catalan’s Constant
Flekay
300
12ms
9 Aug 2025
Catalan’s Constant
andrewjc2000
108
55ms
6 Aug 2025
Catalan’s Constant
RaBa21
101
199ms
1 Aug 2025
Catalan’s Constant
Zhenyu-Bo
680
33ms
30 Jul 2025
Catalan’s Constant
wuduculfre
1,011
10ms
28 Jul 2025
Catalan’s Constant
Mathrew2012
1,011
10ms
25 Jul 2025
Catalan’s Constant
muser-logiccpu
1,011
11ms
25 Jul 2025
Catalan’s Constant
dokutan
208
10ms
23 Jul 2025
Catalan’s Constant
fkantelberg
86
85ms
18 Jul 2025
Catalan’s Constant
albanian-laundromat
73
22ms
12 Jul 2025
Catalan’s Constant
KasperKivimaeki
292
271ms
10 Jul 2025
Catalan’s Constant
emgordon154
82
102ms
3 Jul 2025
Catalan’s Constant
PKFire18
670
11ms
23 Jun 2025
Catalan’s Constant
jiji7879
162
481ms
20 Jun 2025
Catalan’s Constant
sean-niemann
69
12ms
14 Jun 2025
Catalan’s Constant
CoolBvll
1,011
9ms
12 Jun 2025
Catalan’s Constant
Fvirgilio
93
11ms
10 May 2025
Catalan’s Constant
fgrosshans
121
914ms
4 May 2025
Catalan’s Constant
MeWhenI
90
14ms
23 Apr 2025
Catalan’s Constant
zacjl
83
14ms
21 Apr 2025
Catalan’s Constant
khvdm
💎
61
14ms
20 Apr 2025
Catalan’s Constant
Seek64
64
15ms
27 Mar 2025
Catalan’s Constant
plcc0
70
12ms
24 Mar 2025
Catalan’s Constant
WillowWispy
228
404ms
23 Mar 2025
Catalan’s Constant
gigaprofisi
1,011
10ms
7 Mar 2025
Catalan’s Constant
JunkIce
301
12ms
5 Mar 2025
Catalan’s Constant
hiichbindermax
148
2,776ms
15 Feb 2025
Catalan’s Constant
ovs-code
77
13ms
14 Feb 2025
Catalan’s Constant
TheAtrossian
1,011
11ms
5 Jan 2025
Catalan’s Constant
AidanWalter
1,011
12ms
3 Jan 2025
Catalan’s Constant
stefangimmillaro
88
13ms
30 Dec 2024
Catalan’s Constant
lifthrasiir
70
14ms
7 Dec 2024
Catalan’s Constant
croc54
90
28ms
27 Nov 2024
Catalan’s Constant
wh3n3v3r
386
16ms
18 Nov 2024
Catalan’s Constant
OSYCh314
1,011
10ms
12 Nov 2024
Catalan’s Constant
Apzyte-Gamer
1,011
10ms
10 Oct 2024
Catalan’s Constant
Languag3
1,011
10ms
10 Oct 2024
Catalan’s Constant
zyc-2024
675
10ms
5 Oct 2024
Catalan’s Constant
jatloe
386
19ms
26 Sep 2024
Catalan’s Constant
CorporalCrawdad
1,011
11ms
10 Sep 2024
Catalan’s Constant
Mabeloid
208
11ms
8 Sep 2024
Catalan’s Constant
Ralac07
1,011
10ms
4 Sep 2024
Catalan’s Constant
Mikey-Beep
236
3,700ms
2 Sep 2024
Catalan’s Constant
duckyluuk
82
97ms
15 Aug 2024
Catalan’s Constant
Argon1999
1,011
11ms
4 Aug 2024
Catalan’s Constant
kg583
64
16ms
29 Jul 2024
Catalan’s Constant
pardouin
🥈
62
14ms
11 Jul 2024
Catalan’s Constant
jiaminglimjm
119
93ms
5 Jul 2024
Catalan’s Constant
CutSandstone
120
274ms
3 Jul 2024
Catalan’s Constant
Bulmenisaurus
138
154ms
2 Jul 2024
Catalan’s Constant
FranklinJiaChen
852
10ms
30 Jun 2024