The
Calendar
hole will go live in approximately
2 days
. Why not try and solve it ahead of time?
Recent Solutions
Achievements
Cheevos
Golfers
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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
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><>
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
Tower of Hanoi
KatieLG
366
134ms
23 hours ago
𝑒
dokutan
670
131ms
45 hours ago
√2
dokutan
661
127ms
45 hours ago
φ
dokutan
661
119ms
45 hours ago
τ
dokutan
666
123ms
45 hours ago
π
dokutan
661
127ms
45 hours ago
λ
dokutan
662
130ms
45 hours ago
γ
dokutan
659
117ms
45 hours ago
Van Eck Sequence
dokutan
1,237
122ms
45 hours ago
Vampire Numbers
dokutan
585
121ms
45 hours ago
Trinomial Triangle
dokutan
1,079
115ms
45 hours ago
Smith Numbers
dokutan
1,090
119ms
45 hours ago
Sierpiński Triangle
dokutan
173
128ms
45 hours ago
Rijndael S-box
dokutan
506
120ms
45 hours ago
Polyominoes
dokutan
922
119ms
45 hours ago
Number Spiral
dokutan
246
120ms
45 hours ago
N Queens
dokutan
699
126ms
45 hours ago
Mandelbrot
dokutan
309
118ms
45 hours ago
Lucky Numbers
dokutan
2,399
122ms
45 hours ago
Look and Say
dokutan
357
123ms
45 hours ago
ln 2
dokutan
661
122ms
45 hours ago
Kolakoski Constant
dokutan
663
119ms
45 hours ago
Kaprekar Numbers
dokutan
349
119ms
45 hours ago
Hilbert Curve
dokutan
423
124ms
45 hours ago
Hexagonal Spiral
dokutan
266
118ms
45 hours ago
Gijswijt’s Sequence
dokutan
149
119ms
45 hours ago
Factorial Factorisation
dokutan
411
121ms
45 hours ago
Diamonds
dokutan
153
133ms
45 hours ago
Catalan’s Constant
dokutan
661
114ms
45 hours ago
24 Game
dokutan
1,990
123ms
45 hours ago
12 Days of Christmas
dokutan
454
117ms
45 hours ago
Hexagonal Spiral
bitsandbeyond
214
164ms
2 days ago
Fibonacci
albanian-laundromat
47
126ms
3 days ago
Tower of Hanoi
emgordon154
54
128ms
8 days ago
Tower of Hanoi
JayXon
🥇
47
153ms
9 days ago
Topological Sort
sean-niemann
💎
135
183ms
10 days ago
γ
JOrE20
1,016
118ms
12 days ago
Tongue-twisters
prestosilver
552
118ms
12 days ago
Emirp Numbers
JayXon
🥇
59
146ms
12 days ago
Abundant Numbers (Long)
DialFrost
61
122ms
14 days ago
Abundant Numbers
DialFrost
60
119ms
14 days ago
Niven Numbers
snoozingnewt
45
123ms
16 days ago
Pernicious Numbers
snoozingnewt
37
113ms
19 days ago
Prime Numbers
snoozingnewt
🥇
39
120ms
19 days ago
Tongue-twisters
rucin93
🥈
279
132ms
21 days ago
λ
sean-niemann
🥉
190
201ms
21 days ago
Leap Years
snoozingnewt
48
118ms
21 days ago
Multitap Input
Shanethegamer
135
125ms
23 days ago
Fibonacci
GolfingSuccess
38
118ms
25 days ago
Prime Numbers
tomh1012
77
139ms
26 days ago
Catalan Numbers
snoozingnewt
49
117ms
26 days ago
Lucky Numbers
sean-niemann
69
147ms
26 days ago
Zodiac Signs
AlephSquirrel
179
144ms
26 days ago
Tower of Hanoi
sean-niemann
50
126ms
27 days ago
Tower of Hanoi
dokutan
122
130ms
27 days ago
Spelling Numbers
dokutan
1,009
176ms
27 days ago
Lucky Tickets
dokutan
4,949
199ms
27 days ago
Tower of Hanoi
lukegustafson
🥉
48
131ms
1 Dec 2025
24 Game
KatieLG
5,291
164ms
30 Nov 2025
Arithmetic Numbers
KatieLG
24,808
162ms
30 Nov 2025
Prime Numbers (Long)
KatieLG
4,376
152ms
30 Nov 2025
Pernicious Numbers (Long)
KatieLG
15,437
175ms
30 Nov 2025
99 Bottles of Beer
KatieLG
1,318
127ms
30 Nov 2025
Van Eck Sequence
KatieLG
1,715
141ms
30 Nov 2025
Vampire Numbers
KatieLG
1,037
127ms
30 Nov 2025
Trinomial Triangle
KatieLG
1,876
127ms
30 Nov 2025
Tongue-twisters
KatieLG
504
134ms
30 Nov 2025
Smith Numbers
KatieLG
1,660
133ms
30 Nov 2025
Sierpiński Triangle
KatieLG
228
133ms
30 Nov 2025
Rule 110
KatieLG
2,147
137ms
30 Nov 2025
Recamán
KatieLG
803
130ms
30 Nov 2025
Polyominoes
KatieLG
1,378
134ms
30 Nov 2025
Pascal’s Triangle
KatieLG
713
120ms
30 Nov 2025
Partition Numbers
KatieLG
650
121ms
30 Nov 2025
Odious Numbers (Long)
KatieLG
1,679
131ms
30 Nov 2025
Niven Numbers (Long)
KatieLG
5,694
157ms
30 Nov 2025
N Queens
KatieLG
1,193
132ms
30 Nov 2025
Mandelbrot
KatieLG
631
137ms
30 Nov 2025
Lucky Numbers
KatieLG
3,816
140ms
30 Nov 2025
Look and Say
KatieLG
729
131ms
30 Nov 2025