Recent Solutions
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
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
Calendar
Connect Four
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
NFA Simulator
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Tower of Hanoi
Turtle
Tutorial
All Languages
><>
Assembly
AWK
Bash
BASIC
Berry
brainfuck
C
C#
C++
Civet
Clojure
COBOL
Coconut
Common Lisp
Crystal
D
Dart
Elixir
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
Erlang
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
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
Erlang
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
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
Calendar
Connect Four
CSS Colors (Inverse)
CSS Grid
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Gray Code Decoder
Gray Code Encoder
Hexagonal Spiral
Highly Composite Numbers
NFA Simulator
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Tower of Hanoi
Turtle
Tutorial
Hole
Golfer
Chars
Time
Submitted
Tower of Hanoi
UnderKoen
206
4ms
12 hours ago
Minesweeper
UnderKoen
💎
236
905ms
13 hours ago
Tower of Hanoi
KasperKivimaeki
104
2ms
47 hours ago
ASCII Table
snoozingnewt
297
2ms
2 days ago
Tower of Hanoi
bitsandbeyond
121
2ms
2 days ago
Tower of Hanoi
edsrzf
97
3ms
3 days ago
Tutorial
Openstreetmapler
329
3ms
4 days ago
Tower of Hanoi
Shanethegamer
3,584
2ms
5 days ago
Minesweeper
KatieLG
🥈
342
322ms
6 days ago
Pangram Grep
Ralac07
465
3ms
8 days ago
QR Decoder
KatieLG
🥈
1,865
12ms
12 days ago
Number Spiral
emgordon154
🥉
234
4ms
13 days ago
Pernicious Numbers
snoozingnewt
130
2ms
14 days ago
Ordinal Numbers
snoozingnewt
🥇
32
13ms
15 days ago
Lucky Tickets
KatieLG
🥈
386
3,695ms
15 days ago
Pangram Grep
olleicua
459
6ms
17 days ago
Smith Numbers
KatieLG
🥈
292
962ms
17 days ago
Foo Fizz Buzz Bar
snoozingnewt
208
3ms
18 days ago
Tutorial
luuumine
329
4ms
18 days ago
Tutorial
Babafaba
329
3ms
19 days ago
Farey Sequence
snoozingnewt
156
2ms
20 days ago
Leyland Numbers
snoozingnewt
159
3ms
22 days ago
Quine
snoozingnewt
🥇
67
1ms
22 days ago
Rule 110
KatieLG
🥉
264
44ms
23 days ago
Abundant Numbers
snoozingnewt
188
11ms
25 days ago
Abundant Numbers (Long)
snoozingnewt
188
381ms
25 days ago
Rijndael S-box
KatieLG
390
2ms
26 days ago
Trinomial Triangle
dokutan
🥉
1,889
2ms
6 Oct 2025
Fibonacci
jacekwladzinski
95
2ms
2 Oct 2025
Divisors
snoozingnewt
197
5ms
30 Sep 2025
Trinomial Triangle
CaedenHarper
2,074
2ms
30 Sep 2025
Catalan’s Constant
KatieLG
🥉
366
3ms
30 Sep 2025
Niven Numbers
snoozingnewt
100
2ms
30 Sep 2025
Prime Numbers (Long)
snoozingnewt
168
1,131ms
28 Sep 2025
Prime Numbers
snoozingnewt
167
2ms
28 Sep 2025
Tutorial
KatieLG
126
4ms
27 Sep 2025
Divisors
Briseglace
149
3ms
26 Sep 2025
Leap Years
snoozingnewt
115
2ms
26 Sep 2025
Time Distance
emgordon154
💎
304
6ms
24 Sep 2025
Ordinal Numbers
Just4FunCoder
192
11ms
24 Sep 2025
Fibonacci
iczelia
78
2ms
22 Sep 2025
Pangram Grep
InigoK
699
3ms
20 Sep 2025
Kolakoski Constant
snoozingnewt
1,010
2ms
20 Sep 2025
Ordinal Numbers
Kacarott
🥇
32
11ms
20 Sep 2025
Fibonacci
Kacarott
71
2ms
20 Sep 2025
Tutorial
snoozingnewt
58
3ms
15 Sep 2025
Prime Numbers (Long)
CaedenHarper
364
557ms
11 Sep 2025
Arrows
emgordon154
199
4ms
4 Sep 2025
Morse Encoder
emgordon154
🥈
312
3ms
3 Sep 2025
Inventory Sequence
blaztoma
2,706
2ms
3 Sep 2025
𝑒
Jacob385
1,010
2ms
3 Sep 2025
Hilbert Curve
UnderKoen
💎
564
9ms
3 Sep 2025
Hexagonal Spiral
dokutan
595
2ms
30 Aug 2025
Hilbert Curve
CaedenHarper
2,055
2ms
28 Aug 2025
Reverse Polish Notation
UnderKoen
🥉
284
10ms
26 Aug 2025
ISBN
edsrzf
114
6ms
22 Aug 2025
Tutorial
Vexxter9
329
4ms
21 Aug 2025
λ
gigaprofisi
1,010
2ms
18 Aug 2025
Fizz Buzz
h3ra993huskp
123
2ms
17 Aug 2025
Mandelbrot
CaedenHarper
3,369
2ms
16 Aug 2025
Van Eck Sequence
CaedenHarper
2,562
2ms
16 Aug 2025
Vampire Numbers
CaedenHarper
1,078
2ms
16 Aug 2025
Recamán
CaedenHarper
904
2ms
16 Aug 2025
Pernicious Numbers
CaedenHarper
107
2ms
16 Aug 2025
Niven Numbers
CaedenHarper
98
2ms
16 Aug 2025
Lucky Numbers
CaedenHarper
4,827
2ms
16 Aug 2025
Leyland Numbers
CaedenHarper
893
2ms
16 Aug 2025
Happy Numbers
CaedenHarper
114
2ms
16 Aug 2025
Fibonacci
CaedenHarper
141
2ms
16 Aug 2025
Christmas Trees
CaedenHarper
552
2ms
16 Aug 2025
Ascending Primes
retrohun
519
2ms
16 Aug 2025
ASCII Table
CaedenHarper
280
2ms
16 Aug 2025
Ascending Primes
CaedenHarper
519
2ms
16 Aug 2025
Abundant Numbers (Long)
CaedenHarper
971
4ms
16 Aug 2025
Abundant Numbers
CaedenHarper
170
2ms
16 Aug 2025