The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 24 hours. Why not try and solve them ahead of time?
Tutorial in all languages in bytes. Achievements Cheevos Holes Languages Medals Miscellaneous 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 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 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 Rectangle Fill Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 638th Natanaelel 🇸🇪 0 57 2ms 20 Dec 2025 638th error256 0 57 82ms 1 Feb 2026 643rd kg583 🇺🇸 0 58 6ms 21 Nov 2024 643rd ovs-code 🇩🇪 0 58 6ms 25 Nov 2024 643rd GolfingSuccess 🇬🇷 0 58 6ms 25 Nov 2024 643rd GolfingSuccess 🇬🇷 0 58 3ms 25 Nov 2024 643rd AlephSquirrel 0 58 6ms 25 Nov 2024 643rd emgordon154 0 58 3ms 26 Nov 2024 643rd m-tkach 🇺🇦 0 58 3ms 26 Nov 2024 643rd emgordon154 0 58 6ms 27 Nov 2024 643rd Shanethegamer 🇺🇸 0 58 3ms 10 Dec 2024 643rd MeWhenI 🇻🇦 0 58 3ms 11 Dec 2024 643rd Shanethegamer 🇺🇸 0 58 6ms 17 Dec 2024 643rd zacjl 0 58 6ms 31 Dec 2024 643rd CaedenHarper 🇨🇦 0 58 3ms 4 Jan 2025 643rd CLOStrophobic 🇮🇹 0 58 6ms 17 Jan 2025 643rd voytxt 🇨🇿 0 58 3ms 25 Jan 2025 643rd sisyphus-ppcg 🇦🇺 0 58 3ms 28 Jan 2025 643rd UnderKoen 🇳🇱 0 58 4ms 28 Jan 2025 643rd dokutan 0 58 570ms 3 Feb 2025 643rd HumanoidCPU 0 58 3ms 4 Feb 2025 643rd emgordon154 0 58 8ms 5 Feb 2025 643rd edsrzf 🇳🇿 0 58 5ms 9 Feb 2025 643rd targrik 0 58 3ms 15 Feb 2025 643rd edsrzf 🇳🇿 0 58 3ms 19 Feb 2025 643rd orthoplex 🇨🇽 0 58 4ms 16 Apr 2025 643rd edsrzf 🇳🇿 0 58 4ms 17 Apr 2025 643rd DialFrost 🇸🇬 0 58 6ms 17 Apr 2025 643rd DialFrost 🇸🇬 0 58 4ms 17 Apr 2025 643rd Shanethegamer 🇺🇸 0 58 4ms 17 Apr 2025 643rd DialFrost 🇸🇬 0 58 4ms 17 Apr 2025 643rd GolfingSuccess 🇬🇷 0 58 4ms 17 Apr 2025 643rd HumanoidCPU 0 58 6ms 18 Apr 2025 643rd HumanoidCPU 0 58 4ms 18 Apr 2025 643rd CaedenHarper 🇨🇦 0 58 6ms 18 Apr 2025 643rd CaedenHarper 🇨🇦 0 58 4ms 18 Apr 2025 643rd dokutan 0 58 3ms 28 Apr 2025 643rd 2bular 0 58 3ms 8 Jul 2025 643rd frankgraziano 0 58 6ms 13 Aug 2025 643rd snoozingnewt 🇨🇦 0 58 6ms 15 Sep 2025 643rd snoozingnewt 🇨🇦 0 58 4ms 15 Sep 2025 643rd snoozingnewt 🇨🇦 0 58 3ms 15 Sep 2025 643rd kg583 🇺🇸 0 58 4ms 27 Sep 2025 643rd plcc0 0 58 6ms 7 Oct 2025 643rd TheZwierzLF 🇵🇱 0 58 535ms 21 Nov 2025 643rd JOrE20 0 58 6ms 25 Nov 2025 687th MeWhenI 🇻🇦 0 59 6ms 11 Dec 2024 687th emgordon154 0 59 4ms 8 Jan 2025 687th duckyluuk 🇳🇱 0 59 6ms 12 Jan 2025 687th Natanaelel 🇸🇪 0 59 4ms 2 Feb 2025 687th ovs-code 🇩🇪 0 59 14ms 4 Feb 2025 687th Shanethegamer 🇺🇸 0 59 3ms 7 Feb 2025 687th voytxt 🇨🇿 0 59 6ms 8 Feb 2025 687th GolfingSuccess 🇬🇷 0 59 14ms 15 Feb 2025 687th 2bular 0 59 14ms 5 Mar 2025 687th DialFrost 🇸🇬 0 59 15ms 17 Apr 2025 687th zacjl 0 59 15ms 17 Apr 2025 687th Shanethegamer 🇺🇸 0 59 15ms 17 Apr 2025 687th HumanoidCPU 0 59 15ms 18 Apr 2025 687th dokutan 0 59 15ms 28 Apr 2025 687th edsrzf 🇳🇿 0 59 14ms 13 Jun 2025 687th LostSyntax21 🇬🇧 0 59 4ms 19 Jul 2025 687th snoozingnewt 🇨🇦 0 59 14ms 15 Sep 2025 687th gaving-quadprep 0 59 60ms 26 Oct 2025 687th FlyingPenguin223 0 59 3ms 14 Nov 2025 687th MeWhenI 🇻🇦 0 59 2ms 14 Nov 2025 707th xsot 🇸🇬 0 60 5ms 4 Dec 2024 707th CatsAreFluffy 0 60 58ms 13 Dec 2024 707th klixel 🇨🇦 0 60 89ms 8 Apr 2025 707th emgordon154 0 60 2ms 5 Aug 2025 707th emgordon154 0 60 89ms 5 Nov 2025 707th Babafaba 0 60 542ms 24 Nov 2025 707th dokutan 0 60 4ms 9 Feb 2026 714th Shanethegamer 🇺🇸 0 61 12ms 20 Nov 2024 714th stefangimmillaro 0 61 14ms 21 Nov 2024 714th error256 0 61 14ms 21 Nov 2024 714th ovs-code 🇩🇪 0 61 13ms 25 Nov 2024 714th GolfingSuccess 🇬🇷 0 61 12ms 25 Nov 2024 714th sean-niemann 🇺🇸 0 61 13ms 26 Nov 2024 714th duckyluuk 🇳🇱 0 61 13ms 26 Nov 2024 First Prev 641–720 of 3,423 Next Last