The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 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 319th error256 0 91 293ms 14 Jan 2026 319th GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 319th Natanaelel 🇸🇪 0 91 333ms 5 days ago 319th Steffan153 🇫🇮 0 91 57ms 3 days ago 325th Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 325th Yax42 🇫🇷 0 92 68ms 5 days ago 325th edsrzf 🇳🇿 0 92 18ms 3 days ago 328th Yax42 🇫🇷 0 93 392ms 5 days ago 329th Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 329th edsrzf 🇳🇿 0 94 459ms 20 May 2025 329th MeWhenI 🇻🇦 0 94 396ms 4 days ago 329th edsrzf 🇳🇿 0 94 6ms 3 days ago 329th albanian-laundromat 0 94 6ms 3 days ago 329th madex 🇩🇪 0 94 99ms 27 hours ago 335th albanian-laundromat 0 95 114ms 6 Jan 2026 336th Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 336th CaedenHarper 🇨🇦 0 96 416ms 5 days ago 336th edsrzf 🇳🇿 0 96 32ms 5 days ago 336th kumavale 0 96 160ms 3 days ago 340th albanian-laundromat 0 97 44ms 6 Dec 2025 340th tomh1012 0 97 396ms 5 days ago 342nd error256 0 98 155ms 16 Jan 2026 342nd albanian-laundromat 0 98 135ms 23 Feb 2026 342nd edsrzf 🇳🇿 0 98 157ms 3 days ago 345th Shanethegamer 🇺🇸 0 99 352ms 24 Sep 2025 345th madex 🇩🇪 0 99 19ms 27 hours ago 347th edsrzf 🇳🇿 0 100 145ms 9 May 2025 347th JOrE20 0 100 42ms 15 Dec 2025 347th madex 🇩🇪 0 100 113ms 27 hours ago 347th h3ra993huskp 🇯🇵 0 100 392ms 19 hours ago 351st rucin93 🇵🇱 0 101 373ms 24 days ago 351st madex 🇩🇪 0 101 141ms 28 hours ago 353rd fantaize 0 102 150ms 19 days ago 353rd emgordon154 0 102 4ms 4 days ago 353rd madex 🇩🇪 0 102 156ms 3 days ago 356th Jacob385 0 103 386ms 29 hours ago 357th CLOStrophobic 🇮🇹 0 104 21ms 18 Jan 2025 357th kasarino 0 104 4ms 4 days ago 359th kg583 🇺🇸 0 106 38ms 9 May 2025 360th Shanethegamer 🇺🇸 0 107 8ms 9 May 2025 360th AlephSquirrel 0 107 20ms 14 May 2025 362nd CLOStrophobic 🇮🇹 0 108 47ms 17 Feb 2025 362nd edsrzf 🇳🇿 0 108 1,839ms 21 May 2025 362nd albanian-laundromat 0 108 31ms 5 Jan 2026 362nd albanian-laundromat 0 108 83ms 20 days ago 366th kg583 🇺🇸 0 109 43ms 26 days ago 366th GolfingSuccess 🇬🇷 0 109 46ms 26 days ago 366th edsrzf 🇳🇿 0 109 43ms 4 days ago 366th edsrzf 🇳🇿 0 109 35ms 3 days ago 370th retrohun 0 111 41ms 5 days ago 371st GolfingSuccess 🇬🇷 0 112 44ms 24 Jan 2026 372nd Shanethegamer 🇺🇸 0 114 1,281ms 9 May 2025 372nd error256 0 114 513ms 29 Jan 2026 372nd edsrzf 🇳🇿 0 114 489ms 4 days ago 375th emgordon154 0 115 80ms 2 days ago 376th GolfingSuccess 🇬🇷 0 117 283ms 12 Jan 2026 376th albanian-laundromat 0 117 43ms 18 days ago 376th elgan65536 🇺🇸 0 117 156ms 40 mins ago 379th MeWhenI 🇻🇦 0 118 281ms 46 hours ago 380th madex 🇩🇪 0 119 1,373ms 27 hours ago 381st CaedenHarper 🇨🇦 0 120 274ms 5 days ago 381st emgordon154 0 120 65ms 4 days ago 383rd Shanethegamer 🇺🇸 0 121 148ms 13 Dec 2024 383rd madex 🇩🇪 0 121 8ms 27 hours ago 385th albanian-laundromat 0 122 264ms 5 Jan 2026 386th stefangimmillaro 0 124 298ms 10 May 2025 386th Shanethegamer 🇺🇸 0 124 147ms 3 Jun 2025 386th madex 🇩🇪 0 124 272ms 27 hours ago 389th AstroOrbis 0 126 23ms 12 Aug 2025 389th btjones0 0 126 168ms 4 days ago 391st madex 🇩🇪 0 129 366ms 2 days ago 392nd JDiLenarda 🇫🇷 0 131 1,330ms 4 days ago 393rd HumanoidCPU 0 133 165ms 4 days ago 394th edsrzf 🇳🇿 0 136 4,806ms 19 May 2025 395th GolfingSuccess 🇬🇷 0 137 93ms 3 days ago 396th Shanethegamer 🇺🇸 0 139 309ms 13 Dec 2024 396th UnderKoen 🇳🇱 0 139 1,178ms 4 days ago 398th canissimia 🇦🇶 0 145 14ms 2 days ago 399th Shanethegamer 🇺🇸 0 146 31ms 9 May 2025 400th michelebastione 🇮🇹 0 155 2,026ms 7 hours ago First Prev 321–400 of 407 Next Last