The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 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 862nd elana-teal 0 65 11ms 20 Jun 2025 862nd zijinoier 0 65 12ms 25 Jun 2025 862nd dirckvdende 0 65 11ms 30 Jun 2025 862nd BREMAUCY 🇫🇷 0 65 12ms 1 Jul 2025 862nd Quentin-AC 0 65 10ms 2 Jul 2025 862nd qpwoeirut 0 65 11ms 3 Jul 2025 862nd jak-ch-ll 0 65 12ms 6 Jul 2025 862nd anter69 🇭🇺 0 65 12ms 9 Jul 2025 862nd Flekay 🇩🇪 0 65 11ms 10 Jul 2025 862nd klixel 🇨🇦 0 65 10ms 11 Jul 2025 862nd KasperKivimaeki 🇫🇮 0 65 10ms 15 Jul 2025 862nd Nyandereian 0 65 10ms 15 Jul 2025 862nd itu-itis21-akkoyuno21 0 65 11ms 15 Jul 2025 862nd GrayJoKing 🇦🇺 0 65 11ms 18 Jul 2025 862nd AbrahamJLR 🇻🇪 0 65 13ms 18 Jul 2025 862nd RaBa21 🇭🇺 0 65 11ms 19 Jul 2025 862nd jeetsh4h 0 65 10ms 19 Jul 2025 862nd LostSyntax21 🇬🇧 0 65 12ms 19 Jul 2025 862nd wuduculfre 0 65 12ms 21 Jul 2025 862nd yjgnaw 0 65 10ms 24 Jul 2025 862nd oween12 0 65 11ms 6 Aug 2025 862nd xiaoyiming123 0 65 12ms 11 Aug 2025 862nd EthanJantz 0 65 11ms 12 Aug 2025 862nd wobblybits 0 65 13ms 14 Aug 2025 862nd janlelis 0 65 12ms 14 Aug 2025 862nd ShaanveerS 0 65 12ms 17 Aug 2025 862nd ut0s 0 65 10ms 23 Aug 2025 862nd HETHAT 🇩🇿 0 65 12ms 3 Sep 2025 862nd republic82 0 65 12ms 13 Sep 2025 862nd snoozingnewt 🇨🇦 0 65 8ms 15 Sep 2025 862nd snoozingnewt 🇨🇦 0 65 177ms 15 Sep 2025 862nd snoozingnewt 🇨🇦 0 65 11ms 15 Sep 2025 862nd snoozingnewt 🇨🇦 0 65 3ms 15 Sep 2025 862nd hellopir2 0 65 11ms 18 Sep 2025 862nd edsrzf 🇳🇿 0 65 4ms 18 Sep 2025 862nd GolfingSuccess 🇬🇷 0 65 4ms 19 Sep 2025 862nd DialFrost 🇸🇬 0 65 4ms 19 Sep 2025 862nd now4est 🇯🇵 0 65 12ms 21 Sep 2025 862nd ahmetdemirag 🇨🇾 0 65 12ms 24 Sep 2025 862nd J09M 0 65 11ms 25 Sep 2025 862nd ShikChen 🇹🇼 0 65 12ms 26 Sep 2025 862nd Shanethegamer 🇺🇸 0 65 4ms 28 Sep 2025 862nd davecame 0 65 12ms 3 Oct 2025 862nd CommandLeo 🇮🇹 0 65 12ms 4 Oct 2025 862nd pixelated-pup 0 65 10ms 6 Oct 2025 862nd snoozingnewt 🇨🇦 0 65 5ms 6 Oct 2025 862nd luuumine 🇫🇷 0 65 12ms 8 Oct 2025 862nd fvla 0 65 11ms 14 Oct 2025 862nd asarvazyan 0 65 11ms 18 Oct 2025 862nd intgrah 0 65 12ms 22 Oct 2025 862nd Matter1024 🇮🇳 0 65 12ms 15 Nov 2025 862nd j-zhang43 0 65 11ms 17 Nov 2025 862nd msbranicky 0 65 7ms 18 Nov 2025 862nd sunleonid 0 65 10ms 21 Nov 2025 862nd MeWhenI 🇻🇦 0 65 4ms 23 Nov 2025 862nd Babafaba 0 65 11ms 24 Nov 2025 862nd JOrE20 0 65 11ms 25 Nov 2025 862nd Emutis 🇱🇹 0 65 12ms 26 Nov 2025 862nd edsrzf 🇳🇿 0 65 147ms 28 Nov 2025 862nd Languag3 0 65 12ms 5 Dec 2025 862nd FortuiteMan 🇫🇷 0 65 10ms 13 Dec 2025 862nd yujqiao 0 65 11ms 15 Dec 2025 862nd toubsen 🇩🇪 0 65 7ms 30 Dec 2025 862nd HumanoidCPU 0 65 5ms 1 Jan 2026 862nd HumanoidCPU 0 65 3ms 1 Jan 2026 862nd jakcharvat 0 65 10ms 13 Jan 2026 862nd FoxInTheClouds 0 65 10ms 30 Jan 2026 862nd Steffan153 🇫🇮 0 65 10ms 11 Feb 2026 862nd 5cw 🇺🇸 0 65 10ms 11 Feb 2026 862nd theobori 0 65 11ms 27 days ago 862nd Aquateraneal 🇺🇸 0 65 10ms 24 days ago 862nd edward-Han1024 0 65 10ms 23 days ago 862nd randolchance 0 65 12ms 20 days ago 862nd CheeseCake628 🇳🇴 0 65 12ms 20 days ago 862nd dokutan 0 65 4ms 3 days ago 1,036th Shanethegamer 🇺🇸 0 66 109ms 22 Nov 2024 1,036th GolfingSuccess 🇬🇷 0 66 88ms 25 Nov 2024 1,036th Natanaelel 🇸🇪 0 66 193ms 9 Dec 2024 1,036th MeWhenI 🇻🇦 0 66 3ms 11 Dec 2024 1,036th rollershutter 0 66 12ms 18 Dec 2024 First Prev 961–1,040 of 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