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Calendar
hole will go live in approximately
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. 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
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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
Spelling Numbers
ndren
27,588
9ms
5 hours ago
λ
ndren
670
4ms
28 hours ago
Tower of Hanoi
KatieLG
60
6ms
2 days ago
Emojify
Nxllpointer
263
3ms
3 days ago
Fibonacci
commandblockguy
18
3ms
3 days ago
Fizz Buzz
commandblockguy
64
4ms
3 days ago
Quine
ndren
17
3ms
6 days ago
Zeckendorf Representation
AlephSquirrel
68
9ms
7 days ago
Rijndael S-box
AlephSquirrel
144
6ms
7 days ago
λ
JOrE20
1,006
3ms
8 days ago
Catalan Numbers
AlephSquirrel
96
148ms
10 days ago
Kolakoski Constant
AlephSquirrel
96
1,028ms
10 days ago
Maze
AlephSquirrel
115
66ms
10 days ago
Ordinal Numbers
AlephSquirrel
73
9ms
10 days ago
Minesweeper
AlephSquirrel
82
10ms
10 days ago
Game of Life
AlephSquirrel
77
3ms
10 days ago
√2
AlephSquirrel
129
790ms
10 days ago
φ
AlephSquirrel
130
282ms
10 days ago
ln 2
AlephSquirrel
117
617ms
10 days ago
τ
AlephSquirrel
109
613ms
10 days ago
π
AlephSquirrel
109
615ms
10 days ago
𝑒
AlephSquirrel
81
58ms
10 days ago
Poker
AlephSquirrel
283
7ms
11 days ago
Collatz
AlephSquirrel
48
284ms
11 days ago
Transpose Sentence
AlephSquirrel
53
4ms
12 days ago
Musical Chords
AlephSquirrel
107
6ms
12 days ago
Forsyth–Edwards Notation
AlephSquirrel
94
7ms
12 days ago
Reverse Polish Notation
AlephSquirrel
88
11ms
12 days ago
Happy Numbers (Long)
AlephSquirrel
37
16ms
12 days ago
Emirp Numbers (Long)
AlephSquirrel
56
7ms
12 days ago
Gijswijt’s Sequence
AlephSquirrel
75
1,170ms
12 days ago
Emirp Numbers
AlephSquirrel
56
4ms
12 days ago
Recamán
AlephSquirrel
56
7ms
12 days ago
Van Eck Sequence
AlephSquirrel
46
10ms
12 days ago
Foo Fizz Buzz Bar
AlephSquirrel
79
7ms
12 days ago
ASCII Table
AlephSquirrel
124
4ms
12 days ago
Factorial Factorisation
AlephSquirrel
62
5ms
12 days ago
Divisors
ndren
41
3ms
23 days ago
Prime Numbers
ndren
30
3ms
23 days ago
Prime Numbers (Long)
ndren
31
5ms
23 days ago
Gray Code Decoder
ovs-code
31
10ms
27 days ago
Gray Code Decoder
AlephSquirrel
31
8ms
27 days ago
Fizz Buzz
CornerMercury
68
3ms
30 Nov 2025
Polyominoes
KatieLG
157
1,869ms
30 Nov 2025
Tower of Hanoi
HumanoidCPU
5,620
19ms
28 Nov 2025
Taxicab Numbers
AlephSquirrel
41
7ms
27 Nov 2025
𝑒
BREMAUCY
1,006
2ms
27 Nov 2025
Taxicab Numbers
ovs-code
40
14ms
27 Nov 2025
Arrows
maweowo
137
4ms
27 Nov 2025
Taxicab Numbers
HumanoidCPU
4,647
3ms
27 Nov 2025
Taxicab Numbers
Shanethegamer
4,647
3ms
26 Nov 2025
Smooth Numbers
Shanethegamer
39
10ms
24 Nov 2025
Smooth Numbers
ovs-code
47
8ms
23 Nov 2025
Fizz Buzz
aspiringLich
58
3ms
23 Nov 2025
Evil Numbers
aspiringLich
28
2ms
22 Nov 2025
Arithmetic Numbers
maweowo
45
1,527ms
19 Nov 2025
Evil Numbers
maweowo
21
2ms
19 Nov 2025
Odious Numbers
maweowo
22
2ms
19 Nov 2025
Evil Numbers (Long)
maweowo
23
3ms
19 Nov 2025
Odious Numbers (Long)
maweowo
23
3ms
19 Nov 2025
Fibonacci
maweowo
18
3ms
19 Nov 2025
Abundant Numbers
aspiringLich
69
13ms
17 Nov 2025
Polyominoes
maweowo
115
39ms
13 Nov 2025
Pernicious Numbers
maweowo
29
2ms
12 Nov 2025
Pernicious Numbers (Long)
maweowo
36
22ms
12 Nov 2025
Sierpiński Triangle
Nxllpointer
66
3ms
11 Nov 2025
Van Eck Sequence
Nxllpointer
41
6ms
11 Nov 2025
Niven Numbers
Nxllpointer
38
2ms
11 Nov 2025
Evil Numbers (Long)
Nxllpointer
30
3ms
11 Nov 2025
Look and Say
Nxllpointer
42
4ms
11 Nov 2025
Tutorial
masikoijo
39
3ms
11 Nov 2025
Abundant Numbers
Nxllpointer
45
4ms
10 Nov 2025
Abundant Numbers (Long)
Nxllpointer
46
18ms
10 Nov 2025
ROT13
Nxllpointer
47
3ms
10 Nov 2025
Pangram Grep
Nxllpointer
43
3ms
10 Nov 2025
PalindromemordnilaP
Nxllpointer
55
3ms
10 Nov 2025
Scrambled Sort
Nxllpointer
65
4ms
10 Nov 2025
ISBN
Nxllpointer
73
3ms
10 Nov 2025
ROT13
glassoup
45
3ms
10 Nov 2025
Odious Numbers
Nxllpointer
30
2ms
10 Nov 2025