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 25 days ago 4th darrenks 🇺🇸 0 7 53ms 21 mins ago 11th ovs-code 🇩🇪 0 8 61ms 12 Oct 2025 12th GolfingSuccess 🇬🇷 0 13 158ms 8 May 2025 12th Shanethegamer 🇺🇸 0 13 148ms 30 May 2025 14th saito-ta 🇯🇵 0 17 82ms 9 May 2025 14th ovs-code 🇩🇪 0 17 3ms 12 Oct 2025 14th 2bular 0 17 4ms 12 Oct 2025 14th SirBogman 🇺🇸 0 17 4ms 12 Oct 2025 14th GolfingSuccess 🇬🇷 0 17 80ms 13 Dec 2025 19th GolfingSuccess 🇬🇷 0 18 6ms 13 Dec 2025 20th pardouin 🇫🇷 0 19 91ms 25 Feb 2025 20th MeWhenI 🇻🇦 0 19 80ms 8 May 2025 20th emgordon154 0 19 84ms 22 Nov 2025 20th CaedenHarper 🇨🇦 0 19 80ms 2 days ago 24th fuzzylojik-golf 🇺🇸 0 20 79ms 14 hours ago 25th JOrE20 0 24 91ms 13 Feb 2026 26th Shanethegamer 🇺🇸 0 27 4ms 26 Nov 2024 26th Natanaelel 🇸🇪 0 27 6ms 8 May 2025 26th saito-ta 🇯🇵 0 27 4ms 8 May 2025 26th Natanaelel 🇸🇪 0 27 4ms 11 May 2025 26th GolfingSuccess 🇬🇷 0 27 4ms 42 hours ago 26th fuzzylojik-golf 🇺🇸 0 27 4ms 15 hours ago 32nd bitsandbeyond 🇳🇱 0 30 383ms 20 Oct 2025 32nd 2bular 0 30 40ms 16 Nov 2025 32nd ovs-code 🇩🇪 0 30 37ms 16 Nov 2025 32nd IISResetMe 0 30 401ms 10 Jan 2026 32nd GolfingSuccess 🇬🇷 0 30 493ms 4 Feb 2026 37th Natanaelel 🇸🇪 0 31 100ms 7 hours ago 38th Shanethegamer 🇺🇸 0 32 102ms 26 Nov 2024 38th DialFrost 🇸🇬 0 32 166ms 24 Feb 2025 38th fuzzylojik-golf 🇺🇸 0 32 100ms 13 hours ago 38th Natanaelel 🇸🇪 0 32 37ms 6 hours ago 42nd Shanethegamer 🇺🇸 0 33 43ms 9 Dec 2024 42nd stefangimmillaro 0 33 42ms 24 Jan 2025 42nd radarek 🇵🇱 0 33 38ms 17 Feb 2025 42nd DialFrost 🇸🇬 0 33 37ms 24 Feb 2025 42nd error256 0 33 38ms 12 Apr 2025 42nd MeWhenI 🇻🇦 0 33 39ms 15 Apr 2025 42nd Natanaelel 🇸🇪 0 33 37ms 2 May 2025 42nd sean-niemann 🇺🇸 0 33 37ms 8 May 2025 42nd GolfingSuccess 🇬🇷 0 33 40ms 8 May 2025 42nd pardouin 🇫🇷 0 33 41ms 15 Feb 2026 42nd Steffan153 🇫🇮 0 33 37ms 19 Feb 2026 42nd CaedenHarper 🇨🇦 0 33 41ms 41 hours ago 42nd emgordon154 0 33 39ms 12 hours ago 55th SirBogman 🇺🇸 0 34 37ms 9 Oct 2025 55th fuzzylojik-golf 🇺🇸 0 34 35ms 15 hours ago 55th Matter1024 🇮🇳 0 34 38ms 5 hours ago 58th BREMAUCY 🇫🇷 0 35 36ms 3 hours ago 59th fuzzylojik-golf 🇺🇸 0 36 35ms 14 hours ago 60th JOrE20 0 37 252ms 9 Dec 2025 61st error256 0 40 1,440ms 12 Apr 2025 61st Shanethegamer 🇺🇸 0 40 1,476ms 30 Apr 2025 61st sean-niemann 🇺🇸 0 40 1,463ms 8 May 2025 61st GolfingSuccess 🇬🇷 0 40 1,433ms 8 May 2025 61st pardouin 🇫🇷 0 40 1,420ms 15 Feb 2026 61st emgordon154 0 40 1,438ms 12 hours ago 67th GolfingSuccess 🇬🇷 0 41 16ms 8 Aug 2025 67th fuzzylojik-golf 🇺🇸 0 41 1,376ms 16 hours ago 69th Shanethegamer 🇺🇸 0 42 10ms 7 Feb 2026 70th sean-niemann 🇺🇸 0 43 8ms 8 May 2025 70th targrik 0 43 9ms 3 Sep 2025 72nd Shanethegamer 🇺🇸 0 44 12ms 10 Dec 2024 72nd DialFrost 🇸🇬 0 44 12ms 24 Feb 2025 72nd rucin93 🇵🇱 0 44 10ms 24 Feb 2025 72nd error256 0 44 11ms 12 Apr 2025 72nd GolfingSuccess 🇬🇷 0 44 9ms 8 May 2025 72nd GolfingSuccess 🇬🇷 0 44 12ms 8 May 2025 72nd Natanaelel 🇸🇪 0 44 10ms 8 May 2025 72nd sean-niemann 🇺🇸 0 44 11ms 8 May 2025 72nd edsrzf 🇳🇿 0 44 9ms 10 May 2025 1–80 of 329 Next Last