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
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
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
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
><>
ALGOL 68
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
ArkScript
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
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
ArkScript
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
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
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
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
Reversi
MeWhenI
💎
138
55ms
8 hours ago
N Queens
albanian-laundromat
💎
149
193ms
9 hours ago
Reversi
albanian-laundromat
🥈
148
81ms
10 hours ago
Musical Chords
albanian-laundromat
💎
276
923ms
10 hours ago
Quine
GolfingSuccess
63
5ms
10 hours ago
Multitap Input
albanian-laundromat
💎
118
16ms
11 hours ago
γ
albanian-laundromat
🥈
260
4ms
34 hours ago
λ
albanian-laundromat
🥈
260
4ms
34 hours ago
Divisors
albanian-laundromat
67
20ms
35 hours ago
Christmas Trees
albanian-laundromat
72
6ms
35 hours ago
Pangram Grep
albanian-laundromat
74
9ms
35 hours ago
Happy Numbers
albanian-laundromat
🥇
58
4ms
35 hours ago
Prime Numbers
albanian-laundromat
58
12ms
35 hours ago
Abundant Numbers
albanian-laundromat
64
30ms
36 hours ago
Abundant Numbers (Long)
albanian-laundromat
65
601ms
36 hours ago
Factorial Factorisation
albanian-laundromat
147
682ms
36 hours ago
Transpose Sentence
albanian-laundromat
89
20ms
38 hours ago
Card Number Validation
albanian-laundromat
108
54ms
38 hours ago
Minesweeper
albanian-laundromat
🥈
154
141ms
40 hours ago
Alphabetic Numbers
HumanoidCPU
3,900
4ms
41 hours ago
Alphabetic Numbers
MeWhenI
285
1,578ms
2 days ago
Maze
MeWhenI
💎
152
123ms
2 days ago
Maze
albanian-laundromat
🥈
154
82ms
2 days ago
Continued Fractions
albanian-laundromat
🥈
157
11ms
2 days ago
Continued Fractions
MeWhenI
💎
150
11ms
2 days ago
Tower of Hanoi
plcc0
97
10ms
3 days ago
ROT13
GolfingSuccess
💎
93
25ms
6 days ago
Collatz
albanian-laundromat
69
94ms
7 days ago
Day of Week
MeWhenI
💎
196
942ms
8 days ago
Day of Week
GolfingSuccess
🥈
201
760ms
8 days ago
Mahjong
MeWhenI
🦄
278
124ms
9 days ago
Fibonacci
plcc0
35
5ms
10 days ago
Zeckendorf Representation
albanian-laundromat
105
22ms
10 days ago
Farey Sequence
GolfingSuccess
💎
76
11ms
11 days ago
Gray Code Decoder
albanian-laundromat
56
37ms
16 days ago
ln 2
JOrE20
1,008
3ms
16 days ago
Foo Fizz Buzz Bar
albanian-laundromat
109
11ms
16 days ago
Fizz Buzz
albanian-laundromat
68
6ms
16 days ago
Fibonacci
Steffan153
35
5ms
18 days ago
Tutorial
kurkale6ka
79
5ms
20 days ago
Multitap Input
duckyluuk
🥈
125
17ms
24 days ago
Fibonacci
bpharaldsson
82
5ms
25 days ago
Tower of Hanoi
jameswmccarty
3,584
5ms
27 days ago
Fibonacci
Stockoh
319
6ms
5 Feb 2026
Tutorial
FortuiteMan
129
7ms
3 Feb 2026
π
JOrE20
1,008
3ms
1 Feb 2026
Multitap Input
dokutan
🥉
905
21ms
1 Feb 2026
Arabic to Roman
bpharaldsson
240
42ms
31 Jan 2026
Fibonacci
Just4FunCoder
42
5ms
28 Jan 2026
π
Andrey2001
1,008
4ms
25 Jan 2026
Fizz Buzz
vhoulbreque
1,106
9ms
24 Jan 2026
Fibonacci
FlyingPenguin223
35
5ms
20 Jan 2026
Niven Numbers
pardouin
61
5ms
16 Jan 2026
Tutorial
Mefred
129
6ms
15 Jan 2026
Gray Code Decoder
GolfingSuccess
49
34ms
12 Jan 2026
Fibonacci
Emutis
141
3ms
11 Jan 2026
Prime Numbers (Long)
Florian-Mt
176
1,902ms
10 Jan 2026
Prime Numbers
Florian-Mt
126
33ms
10 Jan 2026
Tower of Hanoi
Jacob385
3,584
4ms
9 Jan 2026
τ
JOrE20
1,008
4ms
4 Jan 2026
√2
JOrE20
1,008
3ms
4 Jan 2026
φ
JOrE20
1,008
4ms
4 Jan 2026
Partition Numbers
JOrE20
🥉
652
3ms
2 Jan 2026
Kolakoski Constant
JOrE20
🥉
1,008
3ms
2 Jan 2026
Tutorial
HumanoidCPU
53
5ms
1 Jan 2026
Fibonacci
JOrE20
40
5ms
30 Dec 2025
τ
GrayJoKing
💎
164
4,869ms
25 Dec 2025
24 Game
JOrE20
12,437
5ms
21 Dec 2025
Catalan’s Constant
JOrE20
🥉
1,008
4ms
18 Dec 2025
99 Bottles of Beer
JOrE20
528
6ms
18 Dec 2025
Fizz Buzz
JOrE20
163
11ms
18 Dec 2025
Leap Years
JOrE20
160
266ms
18 Dec 2025
γ
JOrE20
1,008
4ms
17 Dec 2025
Tongue-twisters
prestosilver
530
3ms
17 Dec 2025
Smooth Numbers
GolfingSuccess
90
2,550ms
14 Dec 2025
Day of Week
duckyluuk
🥉
262
838ms
12 Dec 2025
Prime Numbers
tomh1012
106
26ms
11 Dec 2025
Odd Polyomino Tiling
JOrE20
21,436
7ms
9 Dec 2025
Taxicab Numbers
JOrE20
4,165
4ms
9 Dec 2025
Evil Numbers
JOrE20
75
3ms
9 Dec 2025