The
Calendar
hole will go live in approximately
4 days
. Why not try and solve it ahead of time?
Recent Solutions
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
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
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
Calendar
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
Multitap Input
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
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
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
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
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
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
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
Calendar
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
Multitap Input
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
Hexagonal Spiral
bitsandbeyond
255
50ms
18 hours ago
Arrows
BREMAUCY
255
3ms
19 hours ago
Fibonacci
albanian-laundromat
52
2ms
34 hours ago
Musical Chords
albanian-laundromat
🥈
257
5ms
2 days ago
Happy Numbers (Long)
albanian-laundromat
100
11ms
3 days ago
Niven Numbers (Long)
albanian-laundromat
🥉
71
15ms
3 days ago
Forsyth–Edwards Notation
albanian-laundromat
197
3ms
3 days ago
Multitap Input
albanian-laundromat
186
7ms
3 days ago
Set
albanian-laundromat
🥈
228
47ms
3 days ago
Lucky Tickets
albanian-laundromat
💎
216
9ms
5 days ago
Cubes
albanian-laundromat
🥇
224
2ms
5 days ago
Calendar
albanian-laundromat
386
5ms
5 days ago
ASCII Table
albanian-laundromat
🥉
146
2ms
5 days ago
Time Distance
albanian-laundromat
🥉
310
4ms
5 days ago
Star Wars GPT
albanian-laundromat
💎
199
5ms
5 days ago
Tower of Hanoi
JayXon
💎
62
3ms
6 days ago
π
albanian-laundromat
🥉
268
1,402ms
6 days ago
Mandelbrot
albanian-laundromat
146
247ms
6 days ago
Hexdump
albanian-laundromat
💎
261
7ms
6 days ago
Pangram Grep
kmathis22
153
3ms
7 days ago
Emojify
albanian-laundromat
265
4ms
7 days ago
Snake
albanian-laundromat
265
244ms
7 days ago
Connect Four
albanian-laundromat
303
201ms
7 days ago
Polygon Triangulations
albanian-laundromat
283
6ms
7 days ago
Smith Numbers
albanian-laundromat
165
358ms
7 days ago
Ordinal Numbers
albanian-laundromat
134
3ms
8 days ago
N Queens
albanian-laundromat
🥈
148
28ms
8 days ago
Catalan Numbers
albanian-laundromat
💎
215
9ms
9 days ago
Catalan Numbers
sean-niemann
🥈
218
13ms
9 days ago
Divisors
Yax42
62
3ms
9 days ago
Leap Years
Yax42
51
2ms
10 days ago
Arrows
bitsandbeyond
160
3ms
10 days ago
Tutorial
frankgraziano
87
3ms
10 days ago
Smooth Numbers
GolfingSuccess
154
769ms
11 days ago
Arithmetic Numbers
DialFrost
🥉
88
1,920ms
11 days ago
Prime Numbers
snoozingnewt
🥇
47
2ms
13 days ago
λ
JOrE20
1,018
2ms
14 days ago
Repeating Decimals
albanian-laundromat
💎
290
5ms
15 days ago
Tongue-twisters
albanian-laundromat
328
2ms
16 days ago
Arrows
snoozingnewt
185
3ms
17 days ago
Niven Numbers
snoozingnewt
🥇
50
2ms
17 days ago
Evil Numbers
snoozingnewt
59
2ms
18 days ago
Day of Week
albanian-laundromat
🥉
263
6ms
20 days ago
Gray Code Decoder
albanian-laundromat
96
5ms
21 days ago
SI Units
albanian-laundromat
🥈
649
711ms
22 days ago
Prime Numbers (Long)
Florian-Mt
84
847ms
22 days ago
Prime Numbers
Florian-Mt
83
2ms
22 days ago
Arrows
albanian-laundromat
181
5ms
23 days ago
Tower of Hanoi
DialFrost
🥉
68
3ms
23 days ago
Tongue-twisters
prestosilver
538
11ms
24 days ago
Tower of Hanoi
sean-niemann
🥈
64
5ms
25 days ago
Tower of Hanoi
CaedenHarper
3,592
4ms
25 days ago
Christmas Trees
albanian-laundromat
🥇
73
3ms
25 days ago
Tower of Hanoi
edsrzf
🥉
68
3ms
26 days ago
24 Game
KatieLG
4,452
102ms
27 days ago
Arithmetic Numbers
KatieLG
23,967
597ms
27 days ago
Farey Sequence
KatieLG
2,318
17ms
27 days ago
Tower of Hanoi
KatieLG
256
8ms
27 days ago
Happy Numbers
snoozingnewt
83
3ms
29 Nov 2025
Tower of Hanoi
dokutan
70
3ms
28 Nov 2025
Zeckendorf Representation
DialFrost
🥇
154
3ms
28 Nov 2025
Fractions
albanian-laundromat
160
158ms
28 Nov 2025
Fibonacci
FortuiteMan
60
2ms
28 Nov 2025
Taxicab Numbers
albanian-laundromat
130
29ms
28 Nov 2025
Polyominoes
albanian-laundromat
🥈
337
423ms
28 Nov 2025
PalindromemordnilaP
albanian-laundromat
🥈
114
3ms
27 Nov 2025
Arrows
AidanWalter
943
3ms
27 Nov 2025
Taxicab Numbers
HumanoidCPU
4,175
2ms
27 Nov 2025
Poker
albanian-laundromat
🥈
455
3ms
26 Nov 2025
Taxicab Numbers
Shanethegamer
4,175
2ms
26 Nov 2025
Spelling Numbers
albanian-laundromat
🥉
434
4ms
26 Nov 2025
Game of Life
albanian-laundromat
🥉
149
5ms
26 Nov 2025
Evil Numbers
albanian-laundromat
51
2ms
26 Nov 2025
Evil Numbers (Long)
albanian-laundromat
52
2ms
26 Nov 2025
Billiards
albanian-laundromat
💎
228
4ms
26 Nov 2025
Reversi
albanian-laundromat
💎
196
174ms
25 Nov 2025
Fibonacci
Andrey2001
62
2ms
24 Nov 2025
Smooth Numbers
albanian-laundromat
155
78ms
24 Nov 2025
Fibonacci
Zach1031
66
2ms
23 Nov 2025
Inventory Sequence
HumanoidCPU
162
3ms
23 Nov 2025