The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 28 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 1st darrenks 🇺🇸 0 6 48ms 6 days ago 1st 2bular 0 6 45ms 5 days ago 1st Natanaelel 🇸🇪 0 6 48ms 5 days ago 1st plcc0 0 6 47ms 5 days ago 5th kg583 🇺🇸 0 10 927ms 8 May 2025 6th 2bular 0 13 4ms 9 Dec 2024 6th ovs-code 🇩🇪 0 13 4ms 5 Jan 2025 6th Natanaelel 🇸🇪 0 13 4ms 8 May 2025 6th SirBogman 🇺🇸 0 13 4ms 12 Oct 2025 6th GolfingSuccess 🇬🇷 0 13 4ms 12 Jan 2026 6th zacjl 0 13 4ms 4 days ago 6th Steffan153 🇫🇮 0 13 4ms 4 days ago 6th emgordon154 0 13 4ms 2 days ago 6th bstrat 0 13 5ms 12 hours ago 15th namelessiw 0 14 335ms 25 Oct 2025 16th saito-ta 🇯🇵 0 18 78ms 11 May 2025 16th GolfingSuccess 🇬🇷 0 18 85ms 12 Jan 2026 16th pardouin 🇫🇷 0 18 80ms 18 Feb 2026 16th MeWhenI 🇻🇦 0 18 79ms 4 days ago 16th emgordon154 0 18 75ms 3 days ago 16th plcc0 0 18 9ms 37 hours ago 22nd albanian-laundromat 0 19 4ms 13 Feb 2026 22nd plcc0 0 19 86ms 5 days ago 24th CaedenHarper 🇨🇦 0 22 94ms 4 days ago 25th albanian-laundromat 0 26 26ms 12 Feb 2026 26th GolfingSuccess 🇬🇷 0 27 27ms 26 Jan 2026 27th 2bular 0 28 36ms 9 Oct 2025 27th SirBogman 🇺🇸 0 28 37ms 9 Oct 2025 29th Natanaelel 🇸🇪 0 29 35ms 11 May 2025 29th ovs-code 🇩🇪 0 29 35ms 9 Oct 2025 29th Natanaelel 🇸🇪 0 29 121ms 6 days ago 29th Steffan153 🇫🇮 0 29 118ms 4 days ago 33rd error256 0 30 26ms 12 Jan 2026 34th AlephSquirrel 0 31 9ms 3 Dec 2025 34th ovs-code 🇩🇪 0 31 9ms 3 Dec 2025 36th MeWhenI 🇻🇦 0 33 28ms 4 days ago 37th 4atj 0 35 368ms 21 May 2025 37th error256 0 35 60ms 12 Jan 2026 39th 4atj 0 36 235ms 21 May 2025 39th saito-ta 🇯🇵 0 36 20ms 6 days ago 41st Natanaelel 🇸🇪 0 37 9ms 11 May 2025 42nd Natanaelel 🇸🇪 0 38 41ms 8 May 2025 42nd ovs-code 🇩🇪 0 38 38ms 13 Jan 2026 42nd Steffan153 🇫🇮 0 38 339ms 19 Feb 2026 42nd pardouin 🇫🇷 0 38 37ms 19 Feb 2026 46th Steffan153 🇫🇮 0 39 513ms 5 days ago 46th madex 🇩🇪 0 39 8ms 2 days ago 48th sean-niemann 🇺🇸 0 40 39ms 10 hours ago 49th stefangimmillaro 0 41 73ms 9 May 2025 49th aksyristos 0 41 104ms 12 days ago 49th MeWhenI 🇻🇦 0 41 42ms 5 days ago 49th lyphyser 0 41 53ms 4 days ago 53rd Shanethegamer 🇺🇸 0 42 41ms 13 Dec 2024 53rd saito-ta 🇯🇵 0 42 386ms 10 May 2025 53rd AlephSquirrel 0 42 5ms 3 Dec 2025 53rd ovs-code 🇩🇪 0 42 6ms 7 Dec 2025 53rd anter69 🇭🇺 0 42 193ms 4 Feb 2026 53rd madex 🇩🇪 0 42 41ms 3 days ago 59th bitsandbeyond 🇳🇱 0 43 3,231ms 10 days ago 59th Lv0Sys 🇵🇱 0 43 38ms 4 days ago 61st error256 0 44 1,261ms 15 Jan 2026 61st AdrienHache 🇫🇷 0 44 53ms 4 Feb 2026 61st emgordon154 0 44 41ms 6 days ago 64th pardouin 🇫🇷 0 45 1,189ms 15 Feb 2026 64th Andriamanitra 🇫🇮 0 45 37ms 5 days ago 64th stefangimmillaro 0 45 1,255ms 5 days ago 67th Steffan153 🇫🇮 0 46 4,649ms 19 Feb 2026 67th Matter1024 🇮🇳 0 46 38ms 6 days ago 67th Solathian 0 46 68ms 4 days ago 67th ovs-code 🇩🇪 0 46 12ms 2 days ago 67th emgordon154 0 46 11ms 42 hours ago 67th sean-niemann 🇺🇸 0 46 4,376ms 16 hours ago 67th Steffan153 🇫🇮 0 46 11ms 14 hours ago 74th albanian-laundromat 0 47 1,193ms 5 Jan 2026 74th anter69 🇭🇺 0 47 1,210ms 4 Feb 2026 76th DialFrost 🇸🇬 0 48 54ms 16 Dec 2025 76th edsrzf 🇳🇿 0 48 888ms 5 days ago 78th GolfingSuccess 🇬🇷 0 49 38ms 12 Jan 2026 78th error256 0 49 312ms 14 Jan 2026 78th albanian-laundromat 0 49 33ms 21 days ago 1–80 of 423 Next Last