The
Calendar
hole will go live in approximately
12 hours
. Why not try and solve it ahead of time?
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
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
Catalan Numbers
amazingalek
2,890
363ms
13 hours ago
Catalan Numbers
dokutan
2,056
114ms
40 hours ago
Catalan Numbers
dokutan
1,763
59ms
3 days ago
Catalan Numbers
NoneTheFewer
80
11ms
3 days ago
Catalan Numbers
Shanethegamer
2,892
3ms
6 days ago
Catalan Numbers
emgordon154
🥇
129
1,625ms
6 days ago
Catalan Numbers
albanian-laundromat
52
75ms
7 days ago
Catalan Numbers
edsrzf
🥇
49
157ms
10 days ago
Catalan Numbers
AlephSquirrel
96
148ms
10 days ago
Catalan Numbers
AdrienHache
🥇
44
10ms
10 days ago
Catalan Numbers
kumavale
💎
135
133ms
11 days ago
Catalan Numbers
ovs-code
💎
138
685ms
12 days ago
Catalan Numbers
TheZwierzLF
71
65ms
12 days ago
Catalan Numbers
albanian-laundromat
💎
215
9ms
13 days ago
Catalan Numbers
sean-niemann
🥈
218
13ms
13 days ago
Catalan Numbers
sean-niemann
🥈
194
12ms
13 days ago
Catalan Numbers
sean-niemann
201
3ms
13 days ago
Catalan Numbers
JOrE20
8,485
3ms
13 days ago
Catalan Numbers
CornerMercury
🥇
41
422ms
13 days ago
Catalan Numbers
rucin93
💎
191
392ms
14 days ago
Catalan Numbers
DialFrost
181
3ms
15 days ago
Catalan Numbers
DialFrost
🥉
164
117ms
15 days ago
Catalan Numbers
DialFrost
🥉
150
13ms
15 days ago
Catalan Numbers
ravnskjaer
288
316ms
15 days ago
Catalan Numbers
dokutan
1,862
378ms
18 days ago
Catalan Numbers
dokutan
1,771
100ms
18 days ago
Catalan Numbers
JOrE20
2,603
2ms
18 days ago
Catalan Numbers
Maashau
2,888
2ms
19 days ago
Catalan Numbers
GolfingSuccess
🥈
71
107ms
19 days ago
Catalan Numbers
targrik
257
1,138ms
20 days ago
Catalan Numbers
error256
🥇
42
63ms
20 days ago
Catalan Numbers
dokutan
1,893
792ms
20 days ago
Catalan Numbers
yujh-yujh
49
9ms
21 days ago
Catalan Numbers
GrayJoKing
43
68ms
21 days ago
Catalan Numbers
edsrzf
47
64ms
21 days ago
Catalan Numbers
Kacarott
🥇
42
62ms
21 days ago
Catalan Numbers
KasperKivimaeki
134
240ms
22 days ago
Catalan Numbers
edsrzf
🥇
58
6ms
23 days ago
Catalan Numbers
albanian-laundromat
🥈
557
24ms
23 days ago
Catalan Numbers
KasperKivimaeki
206
421ms
23 days ago
Catalan Numbers
HumanoidCPU
3,472
6ms
24 days ago
Catalan Numbers
HumanoidCPU
2,925
239ms
24 days ago
Catalan Numbers
Lv0Sys
44
280ms
24 days ago
Catalan Numbers
Lv0Sys
🥇
32
35ms
24 days ago
Catalan Numbers
Lv0Sys
🥇
41
9ms
24 days ago
Catalan Numbers
Lv0Sys
47
9ms
24 days ago
Catalan Numbers
GolfingSuccess
🥇
107
485ms
25 days ago
Catalan Numbers
emgordon154
🥈
71
116ms
25 days ago
Catalan Numbers
DialFrost
🥈
71
102ms
26 days ago
Catalan Numbers
edsrzf
💎
69
97ms
26 days ago
Catalan Numbers
snoozingnewt
48
27ms
27 days ago
Catalan Numbers
snoozingnewt
42
553ms
27 days ago
Catalan Numbers
snoozingnewt
131
383ms
27 days ago
Catalan Numbers
snoozingnewt
1,393
1,200ms
27 days ago
Catalan Numbers
snoozingnewt
74
409ms
27 days ago
Catalan Numbers
snoozingnewt
51
118ms
27 days ago
Catalan Numbers
snoozingnewt
55
1,268ms
27 days ago
Catalan Numbers
snoozingnewt
80
352ms
27 days ago
Catalan Numbers
snoozingnewt
49
117ms
27 days ago
Catalan Numbers
CaedenHarper
2,993
110ms
1 Dec 2025
Catalan Numbers
HumanoidCPU
2,970
7ms
1 Dec 2025
Catalan Numbers
pardouin
🥉
39
693ms
1 Dec 2025
Catalan Numbers
KatieLG
2,622
1,300ms
30 Nov 2025
Catalan Numbers
KatieLG
2,623
122ms
30 Nov 2025
Catalan Numbers
KatieLG
2,510
24ms
30 Nov 2025
Catalan Numbers
KatieLG
2,616
99ms
30 Nov 2025
Catalan Numbers
KatieLG
2,615
647ms
30 Nov 2025
Catalan Numbers
KatieLG
🥉
2,519
88ms
30 Nov 2025
Catalan Numbers
KatieLG
2,630
292ms
30 Nov 2025
Catalan Numbers
KatieLG
2,646
175ms
30 Nov 2025
Catalan Numbers
KatieLG
2,759
70ms
30 Nov 2025
Catalan Numbers
KatieLG
2,633
238ms
30 Nov 2025
Catalan Numbers
KatieLG
2,432
3ms
30 Nov 2025
Catalan Numbers
KatieLG
2,726
5ms
30 Nov 2025
Catalan Numbers
KatieLG
2,616
3,184ms
30 Nov 2025
Catalan Numbers
KatieLG
2,650
445ms
30 Nov 2025
Catalan Numbers
KatieLG
2,710
100ms
30 Nov 2025
Catalan Numbers
KatieLG
2,474
78ms
30 Nov 2025
Catalan Numbers
KatieLG
2,798
2ms
30 Nov 2025
Catalan Numbers
KatieLG
2,709
135ms
30 Nov 2025