The
Calendar
hole will go live in approximately
11 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
Chars
Time
Submitted
Billiards
TheZwierzLF
220
58ms
84 mins ago
Calendar
Natanaelel
188
51ms
3 hours ago
Hexagonal Spiral
bitsandbeyond
168
33ms
4 hours ago
Christmas Trees
TheZwierzLF
68
33ms
5 hours ago
Smith Numbers
TheZwierzLF
136
236ms
6 hours ago
Fractions
TheZwierzLF
71
36ms
6 hours ago
N Queens
blaztoma
83
118ms
6 hours ago
Abundant Numbers (Long)
TheZwierzLF
56
76ms
8 hours ago
Calendar
ovs-code
142
38ms
10 hours ago
Calendar
stefangimmillaro
171
34ms
14 hours ago
Pernicious Numbers
blaztoma
30
41ms
19 hours ago
Set
sean-niemann
🥉
63
66ms
26 hours ago
Catalan Numbers
TheZwierzLF
71
45ms
27 hours ago
Kaprekar Numbers
TheZwierzLF
263
3,693ms
27 hours ago
Sierpiński Triangle
blaztoma
55
37ms
28 hours ago
Emirp Numbers (Long)
TheZwierzLF
86
442ms
28 hours ago
Cubes
TheZwierzLF
172
37ms
28 hours ago
Trinomial Triangle
TheZwierzLF
63
44ms
28 hours ago
Pascal’s Triangle
TheZwierzLF
61
40ms
28 hours ago
Partition Numbers
TheZwierzLF
99
58ms
28 hours ago
Medal Tally
TheZwierzLF
255
53ms
29 hours ago
Quine
logalex8369
29
53ms
30 hours ago
N Queens
TheZwierzLF
121
76ms
31 hours ago
Rule 110
TheZwierzLF
121
80ms
33 hours ago
Proximity Grid
TheZwierzLF
203
70ms
33 hours ago
Seven Segment
TheZwierzLF
172
31ms
33 hours ago
Calendar
sean-niemann
170
40ms
33 hours ago
φ
TheZwierzLF
103
53ms
33 hours ago
Multitap Input
stefangimmillaro
76
48ms
39 hours ago
Fizz Buzz
amazingalek
72
35ms
42 hours ago
Levenshtein Distance
TheZwierzLF
197
49ms
2 days ago
Ordinal Numbers
TheZwierzLF
82
38ms
2 days ago
Divisors
TheZwierzLF
48
33ms
2 days ago
Number Spiral
TheZwierzLF
181
32ms
2 days ago
Van Eck Sequence
TheZwierzLF
64
33ms
2 days ago
Diamonds
TheZwierzLF
121
40ms
2 days ago
Forsyth–Edwards Notation
TheZwierzLF
138
40ms
2 days ago
Niven Numbers
TheZwierzLF
39
34ms
2 days ago
Niven Numbers (Long)
TheZwierzLF
39
45ms
2 days ago
Fibonacci
Pyroan
38
34ms
2 days ago
Leyland Numbers
TheZwierzLF
79
38ms
2 days ago
Leap Years
TheZwierzLF
48
38ms
2 days ago
Arithmetic Numbers
TheZwierzLF
85
1,949ms
2 days ago
γ
JOrE20
1,008
35ms
2 days ago
Minesweeper
dokutan
113
78ms
2 days ago
Sudoku (Fill-in)
blaztoma
173
134ms
2 days ago
Repeating Decimals
blaztoma
112
59ms
2 days ago
Diamonds
gigaprofisi
1,109
48ms
2 days ago
Gijswijt’s Sequence
TheZwierzLF
114
272ms
3 days ago
Tic-tac-toe
TheZwierzLF
176
53ms
3 days ago
ISBN
TheZwierzLF
88
42ms
3 days ago
Sierpiński Triangle
TheZwierzLF
69
44ms
3 days ago
Zodiac Signs
TheZwierzLF
206
48ms
3 days ago
Happy Numbers
TheZwierzLF
111
49ms
3 days ago
Happy Numbers (Long)
TheZwierzLF
112
49ms
3 days ago
Emirp Numbers
TheZwierzLF
94
44ms
3 days ago
Factorial Factorisation
TheZwierzLF
181
64ms
3 days ago
Farey Sequence
TheZwierzLF
173
95ms
3 days ago
Tower of Hanoi
TheZwierzLF
84
42ms
3 days ago
Spelling Numbers
TheZwierzLF
509
55ms
3 days ago
Fizz Buzz
TheZwierzLF
84
48ms
3 days ago
Foo Fizz Buzz Bar
TheZwierzLF
129
54ms
3 days ago
Arabic to Roman
TheZwierzLF
154
102ms
3 days ago
Lucky Numbers
TheZwierzLF
87
2,166ms
3 days ago
Fizz Buzz
Yax42
63
49ms
3 days ago
Leap Years
Matter1024
48
35ms
3 days ago
Fizz Buzz
mwarvik
73
54ms
3 days ago
Inventory Sequence
TheZwierzLF
56
35ms
4 days ago
Jacobi Symbol
TheZwierzLF
154
34ms
4 days ago
Partition Numbers
sisyphus-ppcg
🥉
46
55ms
4 days ago
Abundant Numbers
TheZwierzLF
57
35ms
4 days ago
Recamán
TheZwierzLF
61
32ms
4 days ago
Prime Numbers (Long)
TheZwierzLF
47
212ms
4 days ago
Prime Numbers
TheZwierzLF
45
33ms
4 days ago
Rock-paper-scissors-Spock-lizard
TheZwierzLF
232
44ms
4 days ago
Ten-pin Bowling
blaztoma
149
56ms
4 days ago
Diamonds
kurkale6ka
1,108
37ms
4 days ago
Star Wars GPT
blaztoma
74
38ms
4 days ago
Collatz
TheZwierzLF
69
40ms
4 days ago
Evil Numbers (Long)
TheZwierzLF
46
42ms
4 days ago