The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Gray Code Encoder 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 1st namelessiw 0 6 160ms 13 Oct 2025 1st Shanethegamer 🇺🇸 0 6 210ms 20 Oct 2025 1st GolfingSuccess 🇬🇷 0 6 156ms 13 Dec 2025 4th Natanaelel 🇸🇪 0 7 68ms 2 May 2025 4th 2bular 0 7 62ms 2 May 2025 4th kg583 🇺🇸 0 7 262ms 8 May 2025 4th GolfingSuccess 🇬🇷 0 7 290ms 14 May 2025 4th Shanethegamer 🇺🇸 0 7 56ms 30 May 2025 4th JOrE20 0 7 275ms 24 days ago 10th ovs-code 🇩🇪 0 8 61ms 12 Oct 2025 11th GolfingSuccess 🇬🇷 0 13 158ms 8 May 2025 11th Shanethegamer 🇺🇸 0 13 148ms 30 May 2025 13th saito-ta 🇯🇵 0 17 82ms 9 May 2025 13th ovs-code 🇩🇪 0 17 3ms 12 Oct 2025 13th 2bular 0 17 4ms 12 Oct 2025 13th SirBogman 🇺🇸 0 17 4ms 12 Oct 2025 13th GolfingSuccess 🇬🇷 0 17 80ms 13 Dec 2025 18th GolfingSuccess 🇬🇷 0 18 6ms 13 Dec 2025 19th pardouin 🇫🇷 0 19 91ms 25 Feb 2025 19th MeWhenI 🇻🇦 0 19 80ms 8 May 2025 19th emgordon154 0 19 85ms 22 Nov 2025 19th CaedenHarper 🇨🇦 0 19 80ms 2 days ago 23rd fuzzylojik-golf 🇺🇸 0 20 79ms 53 mins ago 24th JOrE20 0 24 91ms 13 Feb 2026 25th Shanethegamer 🇺🇸 0 27 4ms 26 Nov 2024 25th Natanaelel 🇸🇪 0 27 6ms 8 May 2025 25th saito-ta 🇯🇵 0 27 4ms 8 May 2025 25th Natanaelel 🇸🇪 0 27 4ms 11 May 2025 25th GolfingSuccess 🇬🇷 0 27 4ms 28 hours ago 25th fuzzylojik-golf 🇺🇸 0 27 4ms 106 mins ago 31st bitsandbeyond 🇳🇱 0 30 383ms 20 Oct 2025 31st 2bular 0 30 40ms 16 Nov 2025 31st ovs-code 🇩🇪 0 30 37ms 16 Nov 2025 31st IISResetMe 0 30 401ms 10 Jan 2026 31st GolfingSuccess 🇬🇷 0 30 493ms 4 Feb 2026 36th Shanethegamer 🇺🇸 0 32 102ms 26 Nov 2024 36th DialFrost 🇸🇬 0 32 189ms 24 Feb 2025 36th Natanaelel 🇸🇪 0 32 176ms 8 May 2025 36th fuzzylojik-golf 🇺🇸 0 32 100ms 14 mins ago 40th Shanethegamer 🇺🇸 0 33 43ms 9 Dec 2024 40th stefangimmillaro 0 33 42ms 24 Jan 2025 40th radarek 🇵🇱 0 33 38ms 17 Feb 2025 40th DialFrost 🇸🇬 0 33 40ms 24 Feb 2025 40th error256 0 33 38ms 12 Apr 2025 40th MeWhenI 🇻🇦 0 33 39ms 15 Apr 2025 40th Natanaelel 🇸🇪 0 33 37ms 2 May 2025 40th sean-niemann 🇺🇸 0 33 37ms 8 May 2025 40th GolfingSuccess 🇬🇷 0 33 40ms 8 May 2025 40th pardouin 🇫🇷 0 33 41ms 15 Feb 2026 40th Steffan153 🇫🇮 0 33 37ms 19 Feb 2026 40th CaedenHarper 🇨🇦 0 33 41ms 28 hours ago 52nd SirBogman 🇺🇸 0 34 37ms 9 Oct 2025 52nd fuzzylojik-golf 🇺🇸 0 34 35ms 95 mins ago 54th emgordon154 0 36 38ms 9 May 2025 54th fuzzylojik-golf 🇺🇸 0 36 35ms 36 mins ago 56th JOrE20 0 37 252ms 9 Dec 2025 57th error256 0 40 1,440ms 12 Apr 2025 57th Shanethegamer 🇺🇸 0 40 1,476ms 30 Apr 2025 57th sean-niemann 🇺🇸 0 40 1,463ms 8 May 2025 57th GolfingSuccess 🇬🇷 0 40 1,433ms 8 May 2025 57th pardouin 🇫🇷 0 40 1,420ms 15 Feb 2026 62nd GolfingSuccess 🇬🇷 0 41 16ms 8 Aug 2025 62nd fuzzylojik-golf 🇺🇸 0 41 1,376ms 3 hours ago 64th Shanethegamer 🇺🇸 0 42 10ms 7 Feb 2026 65th sean-niemann 🇺🇸 0 43 8ms 8 May 2025 65th targrik 0 43 9ms 3 Sep 2025 67th Shanethegamer 🇺🇸 0 44 12ms 10 Dec 2024 67th DialFrost 🇸🇬 0 44 12ms 24 Feb 2025 67th rucin93 🇵🇱 0 44 10ms 24 Feb 2025 67th error256 0 44 11ms 12 Apr 2025 67th GolfingSuccess 🇬🇷 0 44 9ms 8 May 2025 67th GolfingSuccess 🇬🇷 0 44 12ms 8 May 2025 67th Natanaelel 🇸🇪 0 44 10ms 8 May 2025 67th sean-niemann 🇺🇸 0 44 11ms 8 May 2025 67th edsrzf 🇳🇿 0 44 9ms 10 May 2025 67th 4atj 0 44 11ms 8 Jun 2025 67th lukegustafson 🇺🇸 0 44 12ms 16 Jun 2025 67th JOrE20 0 44 12ms 6 Dec 2025 67th AdrienHache 🇫🇷 0 44 60ms 5 Feb 2026 67th voytxt 🇨🇿 0 44 41ms 6 Feb 2026 1–80 of 312 Next Last