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Calendar
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. 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
Chars
Time
Submitted
Day of Week
JayXon
💎
218
218ms
3 hours ago
Day of Week
kumavale
🥈
219
212ms
5 hours ago
Hilbert Curve
canissimia
💎
208
159ms
5 hours ago
Christmas Trees
ian-h-chamberlain
100
136ms
12 hours ago
Fizz Buzz
kitzurea
137
131ms
12 hours ago
Foo Fizz Buzz Bar
kitzurea
208
139ms
12 hours ago
Tower of Hanoi
bitsandbeyond
76
127ms
15 hours ago
Fizz Buzz
lineargraph
132
128ms
39 hours ago
Tower of Hanoi
KatieLG
342
211ms
39 hours ago
Billiards
acotis
💎
219
177ms
45 hours ago
Hexagonal Spiral
bitsandbeyond
297
179ms
3 days ago
Fibonacci
albanian-laundromat
79
116ms
4 days ago
Tutorial
agam-samosa
104
150ms
4 days ago
Sudoku (Fill-in)
acotis
🥉
323
239ms
6 days ago
Sudoku
acotis
🥈
459
216ms
6 days ago
24 Game
acotis
🥇
284
4,191ms
6 days ago
γ
JOrE20
1,023
120ms
6 days ago
Trinomial Triangle
kumavale
🥇
103
137ms
6 days ago
Trinomial Triangle
edsrzf
🥉
105
137ms
6 days ago
12 Days of Christmas
brie-r
2,392
123ms
7 days ago
Christmas Trees
acotis
🥇
89
135ms
9 days ago
Tower of Hanoi
emgordon154
72
132ms
9 days ago
Catalan Numbers
kumavale
💎
135
133ms
10 days ago
Tower of Hanoi
JayXon
🥇
71
132ms
10 days ago
12 Days of Christmas
acotis
474
280ms
11 days ago
Fibonacci
ian-h-chamberlain
🥇
64
133ms
11 days ago
24 Game
rucin93
🥉
317
170ms
12 days ago
24 Game
lynn
🥇
284
1,680ms
12 days ago
Tongue-twisters
prestosilver
543
119ms
12 days ago
Mandelbrot
acotis
🥇
164
201ms
13 days ago
Pernicious Numbers (Long)
ian-h-chamberlain
84
127ms
13 days ago
Emirp Numbers (Long)
ian-h-chamberlain
154
152ms
13 days ago
Emirp Numbers
ian-h-chamberlain
153
136ms
13 days ago
Fizz Buzz
mwarvik
167
145ms
13 days ago
CSS Colors
acotis
🥉
487
226ms
14 days ago
Tongue-twisters
acotis
331
205ms
14 days ago
Day of Week
acotis
🥉
229
216ms
14 days ago
Tutorial
Multirious
105
141ms
14 days ago
Lucky Tickets
acotis
🥉
219
1,285ms
15 days ago
λ
JOrE20
1,023
108ms
17 days ago
Fizz Buzz
Florian-Mt
133
143ms
18 days ago
Arithmetic Numbers
Florian-Mt
116
189ms
18 days ago
Abundant Numbers
Florian-Mt
86
126ms
19 days ago
Abundant Numbers (Long)
Florian-Mt
87
127ms
19 days ago
Day of Week
luuumine
295
173ms
20 days ago
Kolakoski Sequence
luuumine
146
128ms
20 days ago
brainfuck
luuumine
360
161ms
20 days ago
Ordinal Numbers
ian-h-chamberlain
146
149ms
21 days ago
Factorial Factorisation
luuumine
187
132ms
21 days ago
Emirp Numbers (Long)
luuumine
143
145ms
21 days ago
Emirp Numbers
luuumine
142
133ms
21 days ago
Christmas Trees
luuumine
120
143ms
21 days ago
ROT13
luuumine
143
141ms
21 days ago
Divisors
CornerMercury
🥇
78
121ms
22 days ago
Divisors
BREMAUCY
🥇
78
121ms
22 days ago
Pernicious Numbers
luuumine
73
117ms
22 days ago
Pernicious Numbers (Long)
luuumine
77
118ms
22 days ago
Fibonacci
luuumine
69
121ms
22 days ago
Collatz
Lv0Sys
102
128ms
23 days ago
Emojify
JayXon
💎
142
150ms
25 days ago
Happy Numbers
ian-h-chamberlain
126
124ms
25 days ago
Happy Numbers (Long)
ian-h-chamberlain
127
117ms
25 days ago
Lucky Tickets
lynn
224
195ms
25 days ago
Billiards
lynn
🥈
224
192ms
25 days ago
Niven Numbers
snoozingnewt
🥇
61
116ms
26 days ago
Pernicious Numbers
ian-h-chamberlain
72
117ms
26 days ago
Tower of Hanoi
luuumine
72
117ms
26 days ago
Pernicious Numbers (Long)
dokutan
76
119ms
27 days ago
Recamán
azure-blondon
123
149ms
27 days ago
Fibonacci
snoozingnewt
65
118ms
27 days ago
Tower of Hanoi
DialFrost
🥇
71
119ms
2 Dec 2025
Tower of Hanoi
ian-h-chamberlain
574
116ms
2 Dec 2025
Tower of Hanoi
sean-niemann
🥇
71
119ms
2 Dec 2025
Happy Numbers
CaedenHarper
121
122ms
1 Dec 2025
Happy Numbers (Long)
CaedenHarper
122
122ms
1 Dec 2025
Billiards
ovs-code
🥉
233
245ms
1 Dec 2025
Lucky Tickets
dokutan
4,782
607ms
1 Dec 2025
Tower of Hanoi
dokutan
78
121ms
1 Dec 2025
Tower of Hanoi
edsrzf
🥇
71
115ms
1 Dec 2025
Quine
snoozingnewt
🥇
45
111ms
30 Nov 2025