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 72nd 4atj 0 44 11ms 8 Jun 2025 72nd lukegustafson 🇺🇸 0 44 12ms 16 Jun 2025 72nd JOrE20 0 44 12ms 6 Dec 2025 72nd AdrienHache 🇫🇷 0 44 60ms 5 Feb 2026 72nd voytxt 🇨🇿 0 44 41ms 6 Feb 2026 72nd Steffan153 🇫🇮 0 44 28ms 19 Feb 2026 72nd CaedenHarper 🇨🇦 0 44 12ms 41 hours ago 72nd fuzzylojik-golf 🇺🇸 0 44 13ms 15 hours ago 72nd fuzzylojik-golf 🇺🇸 0 44 9ms 15 hours ago 90th Andrey-Plotnikov 0 45 12ms 10 Jan 2025 90th saito-ta 🇯🇵 0 45 555ms 10 May 2025 90th XenThe 🇬🇧 0 45 12ms 15 Jul 2025 90th smclaughlin-cf 0 45 12ms 14 Oct 2025 90th albanian-laundromat 0 45 13ms 2 days ago 95th Shanethegamer 🇺🇸 0 46 377ms 26 Nov 2024 95th lyphyser 0 46 51ms 11 Feb 2025 95th Shanethegamer 🇺🇸 0 46 8ms 30 Apr 2025 95th GolfingSuccess 🇬🇷 0 46 7ms 8 May 2025 95th rucin93 🇵🇱 0 46 8ms 11 May 2025 95th edsrzf 🇳🇿 0 46 7ms 18 hours ago 101st LukeBridges 🇬🇧 0 47 12ms 3 hours ago 102nd kg583 🇺🇸 0 50 470ms 1 Dec 2024 102nd Shanethegamer 🇺🇸 0 50 471ms 10 Dec 2024 102nd GolfingSuccess 🇬🇷 0 50 460ms 30 Dec 2024 102nd ovs-code 🇩🇪 0 50 448ms 23 Feb 2025 102nd pardouin 🇫🇷 0 50 433ms 24 Feb 2025 102nd emgordon154 0 50 424ms 9 May 2025 102nd Steffan153 🇫🇮 0 50 378ms 25 days ago 102nd CaedenHarper 🇨🇦 0 50 733ms 2 days ago 102nd Steffan153 🇫🇮 0 50 776ms 2 days ago 102nd edsrzf 🇳🇿 0 50 872ms 2 days ago 102nd GolfingSuccess 🇬🇷 0 50 765ms 41 hours ago 102nd fuzzylojik-golf 🇺🇸 0 50 420ms 18 hours ago 114th lifthrasiir 🇰🇷 0 51 433ms 11 Dec 2024 114th Shanethegamer 🇺🇸 0 51 5ms 30 Apr 2025 114th GolfingSuccess 🇬🇷 0 51 157ms 8 May 2025 114th rucin93 🇵🇱 0 51 159ms 8 May 2025 114th Shanethegamer 🇺🇸 0 51 150ms 8 May 2025 114th sean-niemann 🇺🇸 0 51 150ms 9 May 2025 114th DialFrost 🇸🇬 0 51 302ms 8 Sep 2025 121st DialFrost 🇸🇬 0 52 474ms 17 Feb 2025 121st CaedenHarper 🇨🇦 0 52 530ms 2 days ago 121st albanian-laundromat 0 52 5ms 2 days ago 124th antimon2 🇯🇵 0 53 288ms 16 Dec 2024 124th Shanethegamer 🇺🇸 0 53 315ms 1 Feb 2025 124th dokutan 0 53 426ms 15 Aug 2025 124th MeWhenI 🇻🇦 0 53 393ms 21 Nov 2025 124th albanian-laundromat 0 53 467ms 15 Jan 2026 124th AlephSquirrel 0 53 383ms 2 days ago 130th Shanethegamer 🇺🇸 0 54 69ms 12 Dec 2024 130th DialFrost 🇸🇬 0 54 269ms 17 Feb 2025 130th error256 0 54 66ms 12 Apr 2025 130th albanian-laundromat 0 54 779ms 15 Jan 2026 130th GolfingSuccess 🇬🇷 0 54 71ms 42 hours ago 135th albanian-laundromat 0 55 39ms 2 days ago 136th Shanethegamer 🇺🇸 0 56 66ms 30 Apr 2025 136th GolfingSuccess 🇬🇷 0 56 70ms 8 May 2025 136th sean-niemann 🇺🇸 0 56 67ms 8 May 2025 136th DialFrost 🇸🇬 0 56 2,628ms 16 Dec 2025 140th Shanethegamer 🇺🇸 0 57 326ms 25 May 2025 140th sean-niemann 🇺🇸 0 57 176ms 25 May 2025 140th edsrzf 🇳🇿 0 57 167ms 25 May 2025 140th GolfingSuccess 🇬🇷 0 57 171ms 13 Dec 2025 140th Matter1024 🇮🇳 0 57 68ms 13 Feb 2026 140th albanian-laundromat 0 57 296ms 28 hours ago 146th GolfingSuccess 🇬🇷 0 58 4,218ms 8 May 2025 147th GolfingSuccess 🇬🇷 0 59 17ms 8 May 2025 147th IanUtley 0 59 18ms 8 May 2025 147th GolfingSuccess 🇬🇷 0 59 63ms 8 May 2025 150th pardouin 🇫🇷 0 60 2,725ms 15 Feb 2026 150th fuzzylojik-golf 🇺🇸 0 60 16ms 16 hours ago 152nd GolfingSuccess 🇬🇷 0 61 2,468ms 8 May 2025 152nd madex 🇩🇪 0 61 2,598ms 3 days ago 154th lifthrasiir 🇰🇷 0 62 37ms 22 Nov 2024 154th GolfingSuccess 🇬🇷 0 62 15ms 25 Nov 2024 154th AlephSquirrel 0 62 15ms 25 Nov 2024 154th hallvabo 🇳🇴 0 62 38ms 26 Nov 2024 154th kg583 🇺🇸 0 62 36ms 1 Dec 2024 154th CornerMercury 🇬🇧 0 62 15ms 3 Dec 2024 154th ndren 0 62 15ms 3 Dec 2024 First Prev 81–160 of 330 Next Last