The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Gray Code Decoder 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 222nd tomh1012 0 77 17ms 2 days ago 222nd HumanoidCPU 0 77 230ms 2 days ago 222nd qpwoeirut 0 77 20ms 2 days ago 222nd btjones0 0 77 19ms 45 hours ago 222nd ComradeSquirrel 0 77 18ms 44 hours ago 222nd bzijlema 🇳🇱 0 77 18ms 42 hours ago 222nd Lv0Sys 🇵🇱 0 77 18ms 17 hours ago 248th jameswmccarty 0 78 20ms 29 Mar 2025 248th DialFrost 🇸🇬 0 78 3ms 10 May 2025 248th solisolu 0 78 20ms 10 Nov 2025 251st BREMAUCY 🇫🇷 0 79 18ms 2 days ago 251st Andrey2001 0 79 18ms 2 days ago 251st edsrzf 🇳🇿 0 79 30ms 42 hours ago 251st madex 🇩🇪 0 79 416ms 30 hours ago 251st mishak-sys 0 79 411ms 14 hours ago 256th Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 256th error256 0 80 466ms 16 Jan 2026 256th stefangimmillaro 0 80 19ms 47 hours ago 256th albanian-laundromat 0 80 29ms 47 hours ago 260th Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 260th Lv0Sys 🇵🇱 0 81 437ms 14 hours ago 260th Aquateraneal 🇺🇸 0 81 19ms 4 hours ago 263rd bricknellj 0 82 17ms 30 Jan 2025 263rd dokutan 0 82 17ms 15 Aug 2025 263rd scpchicken 🇵🇼 0 82 402ms 3 days ago 263rd KatieLG 🇬🇧 0 82 18ms 3 days ago 263rd madex 🇩🇪 0 82 4ms 2 days ago 263rd MeWhenI 🇻🇦 0 82 114ms 29 hours ago 263rd solisolu 0 82 4ms 15 hours ago 270th GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 270th GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 270th error256 0 83 430ms 12 Jan 2026 270th albanian-laundromat 0 83 9ms 26 Jan 2026 270th edsrzf 🇳🇿 0 83 473ms 45 hours ago 270th edsrzf 🇳🇿 0 83 1,251ms 44 hours ago 270th edsrzf 🇳🇿 0 83 106ms 18 hours ago 270th Steffan153 🇫🇮 0 83 416ms 12 hours ago 278th Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 278th edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 278th albanian-laundromat 0 85 92ms 6 Dec 2025 278th GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 278th edsrzf 🇳🇿 0 85 28ms 43 hours ago 283rd kg583 🇺🇸 0 86 23ms 2 Oct 2025 283rd GolfingSuccess 🇬🇷 0 86 2,109ms 17 days ago 285th sean-niemann 🇺🇸 0 87 42ms 9 May 2025 285th CaedenHarper 🇨🇦 0 87 439ms 2 days ago 287th muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 287th albanian-laundromat 0 88 1,372ms 5 Jan 2026 287th error256 0 88 3,067ms 14 Jan 2026 287th IanUtley 0 88 2,941ms 16 Jan 2026 291st Shanethegamer 🇺🇸 0 89 99ms 13 Dec 2024 291st GolfingSuccess 🇬🇷 0 89 64ms 12 Jan 2026 293rd sean-niemann 🇺🇸 0 90 7ms 10 May 2025 293rd dokutan 0 90 65ms 8 Feb 2026 295th ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 295th error256 0 91 62ms 12 Jan 2026 295th error256 0 91 293ms 14 Jan 2026 295th GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 295th Natanaelel 🇸🇪 0 91 333ms 2 days ago 295th Steffan153 🇫🇮 0 91 59ms 12 hours ago 301st Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 301st Yax42 🇫🇷 0 92 68ms 2 days ago 301st edsrzf 🇳🇿 0 92 18ms 20 hours ago 304th Yax42 🇫🇷 0 93 392ms 2 days ago 305th Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 305th edsrzf 🇳🇿 0 94 459ms 20 May 2025 305th MeWhenI 🇻🇦 0 94 396ms 32 hours ago 305th edsrzf 🇳🇿 0 94 6ms 26 hours ago 305th albanian-laundromat 0 94 6ms 26 hours ago 310th albanian-laundromat 0 95 114ms 6 Jan 2026 311th Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 311th CaedenHarper 🇨🇦 0 96 416ms 2 days ago 311th edsrzf 🇳🇿 0 96 32ms 2 days ago 311th kumavale 0 96 155ms 24 hours ago 315th albanian-laundromat 0 97 44ms 6 Dec 2025 315th tomh1012 0 97 396ms 2 days ago 317th error256 0 98 156ms 16 Jan 2026 317th albanian-laundromat 0 98 135ms 23 Feb 2026 317th edsrzf 🇳🇿 0 98 163ms 26 hours ago 320th Shanethegamer 🇺🇸 0 99 352ms 24 Sep 2025 First Prev 241–320 of 370 Next Last