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
Calendar
Card Number Validation
Catalan Numbers
Catalan’s Constant
Christmas Trees
Collatz
Continued Fractions
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
Gray Code Decoder
Gray Code Encoder
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
Multitap Input
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
Alphabetic Numbers
Apéry’s Constant
Binary Lambda Calculus
Connect Four
Crossword
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Hexagonal Spiral
Highly Composite Numbers
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Rectangle Fill
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
All Languages
><>
ALGOL 68
ArkScript
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
APL
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
Lily
Luau
Odin
Picat
Qore
Racket
Rebol
Rexx
Scala
Squirrel
Stax
Uiua
Umka
Vala
Vyxal
Bytes
Chars
Scoring
Bytes
Chars
Language
All
><>
ALGOL 68
ArkScript
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
APL
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Fennel
Harbour
Hare
Haxe
Hush
Hy
iogii
Knight
Lily
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
Calendar
Card Number Validation
Catalan Numbers
Catalan’s Constant
Christmas Trees
Collatz
Continued Fractions
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
Gray Code Decoder
Gray Code Encoder
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
Multitap Input
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
Alphabetic Numbers
Apéry’s Constant
Binary Lambda Calculus
Connect Four
Crossword
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Hexagonal Spiral
Highly Composite Numbers
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Rectangle Fill
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Taxicab Numbers
Turtle
Tutorial
Hole
Golfer
Bytes
Time
Submitted
Fibonacci
Nathan-Masala
62
3ms
73 mins ago
Rule 110
retrohun
🥉
100
2,317ms
13 hours ago
Gray Code Decoder
retrohun
🥉
48
2,812ms
15 hours ago
Gray Code Encoder
retrohun
🥉
55
375ms
15 hours ago
Fibonacci
solisolu
52
2ms
16 hours ago
Tower of Hanoi
NameRandomString
3,583
3ms
30 hours ago
Number Spiral
NameRandomString
300
4ms
30 hours ago
Prime Numbers
jusaka
54
139ms
31 hours ago
Niven Numbers (Long)
NameRandomString
72
29ms
4 days ago
Evil Numbers (Long)
NameRandomString
1,956
2ms
4 days ago
Evil Numbers
NameRandomString
76
2ms
4 days ago
Emirp Numbers (Long)
NameRandomString
1,162
2ms
4 days ago
Emirp Numbers
NameRandomString
142
2ms
4 days ago
Collatz
NameRandomString
3,232
3ms
4 days ago
Catalan Numbers
NameRandomString
2,878
3ms
4 days ago
Abundant Numbers (Long)
NameRandomString
970
2ms
4 days ago
Abundant Numbers
NameRandomString
169
2ms
4 days ago
Rijndael S-box
NameRandomString
774
2ms
4 days ago
√2
NameRandomString
1,007
2ms
4 days ago
φ
NameRandomString
1,007
3ms
4 days ago
τ
NameRandomString
1,007
2ms
4 days ago
λ
NameRandomString
1,007
2ms
4 days ago
γ
NameRandomString
1,007
2ms
4 days ago
Kolakoski Constant
NameRandomString
1,007
2ms
4 days ago
Catalan’s Constant
NameRandomString
1,007
2ms
4 days ago
United States
NameRandomString
490
4ms
4 days ago
ISBN
NameRandomString
122
130ms
4 days ago
λ
jusaka
1,007
2ms
5 days ago
Happy Numbers
jusaka
169
2ms
5 days ago
Tutorial
jusaka
76
3ms
5 days ago
Arabic to Roman
jusaka
508
150ms
5 days ago
Divisors
jusaka
55
31ms
5 days ago
Fibonacci
jusaka
35
2ms
5 days ago
Leap Years
jusaka
44
2ms
5 days ago
Niven Numbers
jusaka
45
2ms
5 days ago
Fizz Buzz
jusaka
63
14ms
5 days ago
N Queens
retrohun
🥉
189
1,919ms
5 days ago
Leap Years
NameRandomString
68
3ms
6 days ago
𝑒
NameRandomString
137
4,029ms
6 days ago
Pascal’s Triangle
NameRandomString
775
2ms
6 days ago
Gray Code Decoder
Steffan153
🥈
38
260ms
6 days ago
Fibonacci
Matter1024
49
2ms
7 days ago
Tutorial
NameRandomString
35
2ms
7 days ago
Niven Numbers
NameRandomString
45
2ms
7 days ago
Fizz Buzz
NameRandomString
72
2ms
7 days ago
Gray Code Decoder
saito-ta
💎
37
551ms
7 days ago
Collatz
Steffan153
🥇
49
66ms
7 days ago
Gray Code Encoder
Steffan153
🥇
45
317ms
7 days ago
99 Bottles of Beer
NameRandomString
450
3ms
8 days ago
Foo Fizz Buzz Bar
NameRandomString
105
8ms
8 days ago
Intersection
NameRandomString
129
7ms
8 days ago
Calendar
NameRandomString
🥈
278
12ms
8 days ago
Arithmetic Numbers
NameRandomString
200
1,593ms
8 days ago
Fractions
NameRandomString
144
24ms
8 days ago
Ascending Primes
NameRandomString
518
2ms
8 days ago
Arabic to Roman
NameRandomString
188
44ms
8 days ago
Seven Segment
NameRandomString
234
2ms
8 days ago
Cubes
NameRandomString
439
14ms
8 days ago
π
NameRandomString
1,007
2ms
8 days ago
Pernicious Numbers
madex
48
2ms
9 days ago
Gray Code Decoder
madex
78
91ms
9 days ago
Gray Code Encoder
madex
85
70ms
9 days ago
Fibonacci
NameRandomString
51
2ms
11 days ago
Day of Week
NameRandomString
220
14ms
12 days ago
Tutorial
marcuswilcour
35
2ms
12 days ago
Quine
aksyristos
🥇
19
2ms
12 days ago
24 Game
NameRandomString
11,131
71ms
14 days ago
Leap Years
Steffan153
🥉
43
2ms
14 days ago
Gray Code Encoder
CaedenHarper
89
101ms
15 days ago
ln 2
NameRandomString
1,007
2ms
20 days ago
Fibonacci
madeforlosers
56
2ms
20 days ago
Collatz
madeforlosers
92
128ms
20 days ago
Abundant Numbers
Steffan153
57
2ms
21 days ago
π
penbuvt
1,007
2ms
23 days ago
Leap Years
madex
58
2ms
23 days ago
Look and Say
gigaprofisi
1,378
2ms
23 days ago
Fractions
madex
138
44ms
23 days ago
Lucky Tickets
retrohun
881
5ms
8 Mar 2026
Alphabetic Numbers
HumanoidCPU
3,901
3ms
5 Mar 2026
Alphabetic Numbers
retrohun
3,901
3ms
5 Mar 2026