The
Snake
hole will go live in approximately
3 hours
. Why not try and solve it ahead of time?
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brainfuck
Calendar
Card Number Validation
Catalan Numbers
Catalan’s Constant
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Christmas Trees
Collatz
Connect Four
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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
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Leap Years
Levenshtein Distance
Leyland Numbers
ln 2
Look and Say
Lucky Numbers
Lucky Tickets
Mahjong
Mandelbrot
Maze
Medal Tally
Minesweeper
Morse Decoder
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Multitap Input
Musical Chords
N Queens
Nim
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)
Taxicab Numbers
Ten-pin Bowling
Tic-tac-toe
Time Distance
Tongue-twisters
Topological Sort
Tower of Hanoi
Transpose Sentence
Trinomial Triangle
Ulam Sequence
United States
Vampire Numbers
Van Eck Sequence
Zeckendorf Representation
Zodiac Signs
γ
λ
π
τ
φ
√2
𝑒
Apéry’s Constant
Binary Lambda Calculus
Chess960 Decoder
Chess960 Encoder
Crossword
CSS Colors (Inverse)
CSS Grid
Dragon Curve
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Hexagonal Spiral
Highly Composite Numbers
Huffman Encoder
Langton’s Ant
Lyndon Factorization
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Rectangle Fill
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Thue–Morse Constant
Turtle
Tutorial
Yellowstone Permutation
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ALGOL 68
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AWK
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BASIC
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brainfuck
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C#
C++
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D
Dart
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Forth
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Go
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Groovy
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iogii
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Janet
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jq
Julia
K
Kotlin
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PHP
PowerShell
Prolog
Python
R
Raku
Rockstar
Ruby
Rust
Scheme
sed
SQL
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Tcl
TeX
V
VimL
Wren
Zig
Experimental Language
05AB1E
APL
Arturo
Befunge
BQN
CJam
CoffeeScript
Egel
Fennel
Harbour
Hare
Haxe
Hush
Hy
Knight
Lily
Luau
Odin
Picat
Qore
Racket
Rebol
Rexx
Scala
Squirrel
Stax
Uiua
Umka
Vala
Vyxal
ZuzuScript
Hole
All
12 Days of Christmas
24 Game
99 Bottles of Beer
Abundant Numbers
Abundant Numbers (Long)
Alphabetic Numbers
Arabic to Roman
Arithmetic Numbers
Arrows
Ascending Primes
ASCII Table
Billiards
brainfuck
Calendar
Card Number Validation
Catalan Numbers
Catalan’s Constant
Chess Move Validation
Christmas Trees
Collatz
Connect Four
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
Nim
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)
Taxicab Numbers
Ten-pin Bowling
Tic-tac-toe
Time Distance
Tongue-twisters
Topological Sort
Tower of Hanoi
Transpose Sentence
Trinomial Triangle
Ulam Sequence
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
Chess960 Decoder
Chess960 Encoder
Crossword
CSS Colors (Inverse)
CSS Grid
Dragon Curve
Ellipse Perimeters
Flags
Floyd-Steinberg Dithering
Hexagonal Spiral
Highly Composite Numbers
Huffman Encoder
Langton’s Ant
Lyndon Factorization
NFA Simulator
Numbrix
Odd Polyomino Tiling
p-adic Expansion
Polygon Triangulations
QR Encoder
Quadratic Formula
Rectangle Fill
Semiprime Numbers
Smooth Numbers
Snake
Sphenic Numbers
Thue–Morse Constant
Turtle
Tutorial
Yellowstone Permutation
Hole
Golfer
Bytes
Time
Submitted
Rijndael S-box
Europe2048
486
226ms
11 hours ago
Tower of Hanoi
Europe2048
27
169ms
12 hours ago
Foo Fizz Buzz Bar
CornerMercury
41
202ms
20 hours ago
Niven Numbers (Long)
CornerMercury
13
205ms
28 hours ago
Niven Numbers
CornerMercury
12
175ms
28 hours ago
Fizz Buzz
ovs-code
36
161ms
28 hours ago
Fizz Buzz
CornerMercury
33
170ms
29 hours ago
Gray Code Decoder
CornerMercury
13
308ms
29 hours ago
Arithmetic Numbers
CornerMercury
17
180ms
29 hours ago
Gray Code Encoder
CornerMercury
6
220ms
30 hours ago
Divisors
CornerMercury
7
158ms
30 hours ago
Forsyth–Edwards Notation
namelessiw
96
184ms
30 hours ago
Reverse Polish Notation
CornerMercury
10
249ms
30 hours ago
Prime Numbers (Long)
CornerMercury
8
1,916ms
31 hours ago
Prime Numbers
CornerMercury
7
169ms
31 hours ago
Fibonacci
CornerMercury
8
158ms
31 hours ago
Tutorial
CornerMercury
24
286ms
31 hours ago
Tutorial
namelessiw
23
270ms
34 hours ago
Odious Numbers
Europe2048
12
169ms
2 days ago
Tutorial
JOrE20
25
304ms
2 days ago
Look and Say
Europe2048
14
684ms
2 days ago
ISBN
Europe2048
21
175ms
2 days ago
Tutorial
Europe2048
26
284ms
3 days ago
Collatz
Europe2048
28
498ms
4 days ago
Pascal’s Triangle
namelessiw
10
163ms
5 days ago
Card Number Validation
Europe2048
25
162ms
5 days ago
Pascal’s Triangle
Europe2048
10
152ms
5 days ago
Tongue-twisters
Europe2048
477
154ms
5 days ago
Kolakoski Sequence
namelessiw
21
165ms
7 days ago
Kolakoski Sequence
Europe2048
25
170ms
7 days ago
Emirp Numbers (Long)
Europe2048
22
236ms
7 days ago
Emirp Numbers
Europe2048
22
161ms
7 days ago
Gray Code Decoder
Europe2048
12
357ms
8 days ago
Factorial Factorisation
Europe2048
30
201ms
8 days ago
Ascending Primes
Europe2048
14
165ms
8 days ago
Thue–Morse Constant
christos-cantina-security
1,006
161ms
15 days ago
Tutorial
christos-cantina-security
28
307ms
15 days ago
Fibonacci
christos-cantina-security
12
161ms
15 days ago
United States
namelessiw
55
247ms
31 Aug 2026
Abundant Numbers (Long)
Europe2048
16
175ms
30 Aug 2026
Chess Move Validation
namelessiw
58
274ms
30 Aug 2026
Thue–Morse Constant
ovs-code
29
163ms
25 Aug 2026
Thue–Morse Constant
namelessiw
29
590ms
25 Aug 2026
Thue–Morse Constant
HumanoidCPU
1,002
172ms
24 Aug 2026
Inventory Sequence
ovs-code
17
811ms
24 Aug 2026
Inventory Sequence
namelessiw
31
4,073ms
23 Aug 2026
Inventory Sequence
Europe2048
19
704ms
22 Aug 2026
Happy Numbers (Long)
Europe2048
14
260ms
22 Aug 2026
Pangram Grep
Europe2048
12
270ms
22 Aug 2026
Tutorial
quasar098
77
391ms
20 Aug 2026
Tower of Hanoi
namelessiw
27
174ms
16 Aug 2026
Leyland Numbers
ovs-code
22
199ms
15 Aug 2026
Leyland Numbers
namelessiw
22
175ms
15 Aug 2026
Leyland Numbers
Europe2048
22
173ms
15 Aug 2026
Leap Years
namelessiw
24
174ms
12 Aug 2026
Recamán
Europe2048
36
179ms
12 Aug 2026
Levenshtein Distance
Europe2048
8
219ms
12 Aug 2026
Leap Years
Europe2048
25
272ms
12 Aug 2026
Pernicious Numbers (Long)
Europe2048
12
392ms
12 Aug 2026
Odious Numbers (Long)
Europe2048
13
197ms
12 Aug 2026
Evil Numbers (Long)
Europe2048
14
191ms
12 Aug 2026
Evil Numbers
Europe2048
12
166ms
12 Aug 2026
Pernicious Numbers
Europe2048
11
168ms
12 Aug 2026
𝑒
Europe2048
17
171ms
12 Aug 2026
π
Europe2048
17
206ms
12 Aug 2026
Recamán
namelessiw
26
203ms
11 Aug 2026
Happy Numbers
Europe2048
14
167ms
11 Aug 2026
Fractions
Europe2048
17
189ms
10 Aug 2026
Foo Fizz Buzz Bar
Europe2048
47
190ms
10 Aug 2026
Abundant Numbers
Europe2048
16
179ms
8 Aug 2026
Yellowstone Permutation
HumanoidCPU
4,011
153ms
8 Aug 2026
Arithmetic Numbers
Europe2048
16
235ms
5 Aug 2026
Catalan Numbers
JOrE20
2,872
162ms
5 Aug 2026
Catalan Numbers
Europe2048
14
164ms
5 Aug 2026
Roman to Arabic
Europe2048
5
1,198ms
5 Aug 2026
Arabic to Roman
Europe2048
5
217ms
5 Aug 2026
Fizz Buzz
Europe2048
39
169ms
5 Aug 2026
Poker
koopa
218
335ms
4 Aug 2026
Niven Numbers (Long)
Europe2048
13
231ms
4 Aug 2026
Niven Numbers
Europe2048
12
174ms
4 Aug 2026
Gray Code Encoder
Europe2048
6
228ms
4 Aug 2026
Prime Numbers (Long)
Europe2048
8
1,995ms
4 Aug 2026
Divisors
Europe2048
7
167ms
4 Aug 2026
Prime Numbers
Europe2048
7
165ms
4 Aug 2026
Fibonacci
Europe2048
8
173ms
4 Aug 2026
Leap Years
someCoder-a11y
26
198ms
24 Jun 2026
Recamán
someCoder-a11y
31
249ms
24 Jun 2026
Gray Code Decoder
someCoder-a11y
11
359ms
24 Jun 2026
Pernicious Numbers
someCoder-a11y
12
170ms
24 Jun 2026
Ulam Sequence
HumanoidCPU
1,093
192ms
12 May 2026
Ulam Sequence
Shanethegamer
1,093
162ms
11 May 2026
Niven Numbers (Long)
someCoder-a11y
14
225ms
5 May 2026
Pangram Grep
someCoder-a11y
12
197ms
2 May 2026
Happy Numbers
someCoder-a11y
20
184ms
2 May 2026
24 Game
someCoder-a11y
4,371
518ms
2 May 2026
Prime Numbers
someCoder-a11y
7
167ms
2 May 2026
Gray Code Encoder
someCoder-a11y
6
201ms
1 May 2026
99 Bottles of Beer
namelessiw
239
234ms
26 Apr 2026
Factorial Factorisation
namelessiw
23
177ms
26 Apr 2026
Vampire Numbers
namelessiw
53
0ms
24 Apr 2026