The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 46 hours. 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 240th Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 240th emgordon154 0 77 161ms 9 May 2025 240th Natanaelel 🇸🇪 0 77 3ms 11 May 2025 240th addmai 0 77 20ms 24 Jul 2025 240th hiichbindermax 0 77 17ms 17 Aug 2025 240th 5cw 🇺🇸 0 77 18ms 22 Aug 2025 240th davecame 0 77 135ms 25 Sep 2025 240th SirBogman 🇺🇸 0 77 232ms 13 Oct 2025 240th jtaxen 0 77 19ms 16 Oct 2025 240th albanian-laundromat 0 77 19ms 25 Nov 2025 240th albanian-laundromat 0 77 412ms 6 Dec 2025 240th anter69 🇭🇺 0 77 139ms 4 Feb 2026 240th Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 240th KasperKivimaeki 🇫🇮 0 77 564ms 14 days ago 240th StefanHabel 🇨🇦 0 77 1,217ms 5 days ago 240th ahmetdemirag 🇨🇾 0 77 18ms 5 days ago 240th tomh1012 0 77 17ms 5 days ago 240th HumanoidCPU 0 77 230ms 5 days ago 240th qpwoeirut 0 77 20ms 4 days ago 240th btjones0 0 77 19ms 4 days ago 240th ComradeSquirrel 0 77 18ms 4 days ago 240th bzijlema 🇳🇱 0 77 18ms 4 days ago 240th Lv0Sys 🇵🇱 0 77 18ms 3 days ago 240th stefangimmillaro 0 77 136ms 21 hours ago 240th LostSyntax21 🇬🇧 0 77 18ms 12 hours ago 266th jameswmccarty 0 78 19ms 29 Mar 2025 266th DialFrost 🇸🇬 0 78 3ms 10 May 2025 266th solisolu 0 78 20ms 10 Nov 2025 266th madex 🇩🇪 0 78 3ms 2 days ago 266th madex 🇩🇪 0 78 91ms 30 hours ago 271st BREMAUCY 🇫🇷 0 79 18ms 5 days ago 271st Andrey2001 0 79 18ms 5 days ago 271st edsrzf 🇳🇿 0 79 30ms 4 days ago 271st mishak-sys 0 79 411ms 3 days ago 271st madex 🇩🇪 0 79 29ms 30 hours ago 276th Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 276th error256 0 80 466ms 16 Jan 2026 276th albanian-laundromat 0 80 29ms 4 days ago 279th Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 279th Lv0Sys 🇵🇱 0 81 437ms 3 days ago 279th Aquateraneal 🇺🇸 0 81 19ms 3 days ago 279th luuumine 🇫🇷 0 81 16ms 2 days ago 279th acollett89 0 81 14ms 2 days ago 279th KatieLG 🇬🇧 0 81 67ms 12 hours ago 285th bricknellj 0 82 17ms 30 Jan 2025 285th dokutan 0 82 17ms 15 Aug 2025 285th scpchicken 🇵🇼 0 82 402ms 6 days ago 285th KatieLG 🇬🇧 0 82 18ms 6 days ago 285th MeWhenI 🇻🇦 0 82 105ms 4 days ago 285th solisolu 0 82 4ms 3 days ago 285th MeWhenI 🇻🇦 0 82 391ms 2 days ago 292nd GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 292nd GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 292nd error256 0 83 430ms 12 Jan 2026 292nd albanian-laundromat 0 83 9ms 26 Jan 2026 292nd edsrzf 🇳🇿 0 83 473ms 4 days ago 292nd edsrzf 🇳🇿 0 83 1,251ms 4 days ago 292nd edsrzf 🇳🇿 0 83 106ms 3 days ago 292nd Steffan153 🇫🇮 0 83 416ms 3 days ago 292nd msbranicky 0 83 18ms 2 days ago 301st madex 🇩🇪 0 84 373ms 27 hours ago 302nd Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 302nd edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 302nd albanian-laundromat 0 85 98ms 6 Dec 2025 302nd GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 302nd edsrzf 🇳🇿 0 85 28ms 4 days ago 307th kg583 🇺🇸 0 86 23ms 2 Oct 2025 307th GolfingSuccess 🇬🇷 0 86 2,109ms 20 days ago 309th sean-niemann 🇺🇸 0 87 42ms 9 May 2025 309th CaedenHarper 🇨🇦 0 87 439ms 5 days ago 309th madex 🇩🇪 0 87 13ms 2 days ago 312th muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 312th albanian-laundromat 0 88 1,372ms 5 Jan 2026 312th error256 0 88 3,067ms 14 Jan 2026 312th IanUtley 0 88 2,941ms 16 Jan 2026 316th Shanethegamer 🇺🇸 0 89 107ms 13 Dec 2024 316th GolfingSuccess 🇬🇷 0 89 64ms 12 Jan 2026 318th sean-niemann 🇺🇸 0 90 7ms 10 May 2025 318th dokutan 0 90 65ms 8 Feb 2026 320th ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 First Prev 241–320 of 408 Next Last