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 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 158th AlephSquirrel 0 76 43ms 3 Dec 2025 158th AlephSquirrel 0 76 445ms 3 Dec 2025 158th albanian-laundromat 0 76 18ms 21 days ago 158th albanian-laundromat 0 76 188ms 14 days ago 158th MeWhenI 🇻🇦 0 76 588ms 7 days ago 166th CornerMercury 🇬🇧 0 77 18ms 3 Dec 2024 166th ndren 0 77 20ms 3 Dec 2024 166th lifthrasiir 🇰🇷 0 77 192ms 11 Dec 2024 166th Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 166th DialFrost 🇸🇬 0 77 19ms 8 May 2025 166th emgordon154 0 77 38ms 9 May 2025 166th edsrzf 🇳🇿 0 77 1,938ms 9 May 2025 166th Natanaelel 🇸🇪 0 77 3ms 11 May 2025 166th addmai 0 77 20ms 24 Jul 2025 166th hiichbindermax 0 77 19ms 17 Aug 2025 166th 5cw 🇺🇸 0 77 18ms 22 Aug 2025 166th davecame 0 77 150ms 25 Sep 2025 166th SirBogman 🇺🇸 0 77 240ms 13 Oct 2025 166th jtaxen 0 77 19ms 16 Oct 2025 166th albanian-laundromat 0 77 19ms 25 Nov 2025 166th albanian-laundromat 0 77 412ms 6 Dec 2025 166th anter69 🇭🇺 0 77 18ms 4 Feb 2026 166th Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 166th KasperKivimaeki 🇫🇮 0 77 564ms 8 days ago 185th jameswmccarty 0 78 20ms 29 Mar 2025 185th DialFrost 🇸🇬 0 78 940ms 10 May 2025 185th DialFrost 🇸🇬 0 78 3ms 10 May 2025 185th solisolu 0 78 20ms 10 Nov 2025 189th KasperKivimaeki 🇫🇮 0 79 3ms 1 Nov 2025 190th Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 190th error256 0 80 466ms 16 Jan 2026 192nd Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 193rd bricknellj 0 82 17ms 30 Jan 2025 193rd dokutan 0 82 17ms 15 Aug 2025 193rd scpchicken 🇵🇼 0 82 402ms 2 hours ago 193rd KatieLG 🇬🇧 0 82 18ms 119 mins ago 197th GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 197th GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 197th error256 0 83 430ms 12 Jan 2026 197th albanian-laundromat 0 83 9ms 26 Jan 2026 201st Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 201st edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 201st albanian-laundromat 0 85 92ms 6 Dec 2025 201st GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 205th kg583 🇺🇸 0 86 23ms 2 Oct 2025 205th GolfingSuccess 🇬🇷 0 86 2,109ms 14 days ago 207th sean-niemann 🇺🇸 0 87 42ms 9 May 2025 208th edsrzf 🇳🇿 0 88 2,094ms 15 May 2025 208th muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 208th solisolu 0 88 3ms 11 Nov 2025 208th albanian-laundromat 0 88 1,372ms 5 Jan 2026 208th error256 0 88 3,067ms 14 Jan 2026 208th IanUtley 0 88 2,941ms 16 Jan 2026 214th Shanethegamer 🇺🇸 0 89 99ms 13 Dec 2024 214th GolfingSuccess 🇬🇷 0 89 65ms 12 Jan 2026 216th sean-niemann 🇺🇸 0 90 7ms 10 May 2025 216th dokutan 0 90 65ms 8 Feb 2026 218th ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 218th error256 0 91 57ms 12 Jan 2026 218th error256 0 91 293ms 14 Jan 2026 218th GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 222nd Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 223rd Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 223rd edsrzf 🇳🇿 0 94 459ms 20 May 2025 225th albanian-laundromat 0 95 114ms 6 Jan 2026 226th Natanaelel 🇸🇪 0 96 266ms 8 May 2025 226th stefangimmillaro 0 96 20ms 10 May 2025 226th Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 226th albanian-laundromat 0 96 5ms 6 Dec 2025 226th MeWhenI 🇻🇦 0 96 399ms 7 days ago 231st edsrzf 🇳🇿 0 97 512ms 24 Sep 2025 231st albanian-laundromat 0 97 44ms 6 Dec 2025 233rd kumavale 0 98 155ms 26 Nov 2025 233rd error256 0 98 156ms 16 Jan 2026 233rd albanian-laundromat 0 98 135ms 23 Feb 2026 236th edsrzf 🇳🇿 0 99 468ms 9 May 2025 236th Shanethegamer 🇺🇸 0 99 352ms 24 Sep 2025 238th edsrzf 🇳🇿 0 100 145ms 9 May 2025 238th edsrzf 🇳🇿 0 100 307ms 9 May 2025 238th edsrzf 🇳🇿 0 100 16ms 9 May 2025 First Prev 161–240 of 274 Next Last