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 15 days ago 158th MeWhenI 🇻🇦 0 76 588ms 8 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 166th StefanHabel 🇨🇦 0 77 1,207ms 60 mins ago 186th jameswmccarty 0 78 20ms 29 Mar 2025 186th DialFrost 🇸🇬 0 78 940ms 10 May 2025 186th DialFrost 🇸🇬 0 78 3ms 10 May 2025 186th solisolu 0 78 20ms 10 Nov 2025 190th KasperKivimaeki 🇫🇮 0 79 3ms 1 Nov 2025 191st Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 191st error256 0 80 466ms 16 Jan 2026 193rd Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 194th bricknellj 0 82 17ms 30 Jan 2025 194th dokutan 0 82 17ms 15 Aug 2025 194th scpchicken 🇵🇼 0 82 402ms 7 hours ago 194th KatieLG 🇬🇧 0 82 18ms 7 hours ago 198th GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 198th GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 198th error256 0 83 430ms 12 Jan 2026 198th albanian-laundromat 0 83 9ms 26 Jan 2026 202nd Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 202nd edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 202nd albanian-laundromat 0 85 92ms 6 Dec 2025 202nd GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 206th kg583 🇺🇸 0 86 23ms 2 Oct 2025 206th GolfingSuccess 🇬🇷 0 86 2,109ms 14 days ago 208th sean-niemann 🇺🇸 0 87 42ms 9 May 2025 209th edsrzf 🇳🇿 0 88 2,094ms 15 May 2025 209th muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 209th solisolu 0 88 3ms 11 Nov 2025 209th albanian-laundromat 0 88 1,372ms 5 Jan 2026 209th error256 0 88 3,067ms 14 Jan 2026 209th IanUtley 0 88 2,941ms 16 Jan 2026 215th Shanethegamer 🇺🇸 0 89 99ms 13 Dec 2024 215th GolfingSuccess 🇬🇷 0 89 65ms 12 Jan 2026 217th sean-niemann 🇺🇸 0 90 7ms 10 May 2025 217th dokutan 0 90 65ms 8 Feb 2026 219th ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 219th error256 0 91 57ms 12 Jan 2026 219th error256 0 91 293ms 14 Jan 2026 219th GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 223rd Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 224th Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 224th edsrzf 🇳🇿 0 94 459ms 20 May 2025 226th albanian-laundromat 0 95 114ms 6 Jan 2026 227th Natanaelel 🇸🇪 0 96 266ms 8 May 2025 227th stefangimmillaro 0 96 20ms 10 May 2025 227th Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 227th albanian-laundromat 0 96 5ms 6 Dec 2025 227th MeWhenI 🇻🇦 0 96 399ms 8 days ago 232nd edsrzf 🇳🇿 0 97 512ms 24 Sep 2025 232nd albanian-laundromat 0 97 44ms 6 Dec 2025 234th kumavale 0 98 155ms 26 Nov 2025 234th error256 0 98 156ms 16 Jan 2026 234th albanian-laundromat 0 98 135ms 23 Feb 2026 237th edsrzf 🇳🇿 0 99 468ms 9 May 2025 237th Shanethegamer 🇺🇸 0 99 352ms 24 Sep 2025 239th edsrzf 🇳🇿 0 100 145ms 9 May 2025 239th edsrzf 🇳🇿 0 100 307ms 9 May 2025 First Prev 161–240 of 275 Next Last