The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Gray Code Decoder in all languages in chars. 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 Chars Time Submitted 228th ahmetdemirag 🇨🇾 0 77 18ms 2 days ago 228th tomh1012 0 77 17ms 2 days ago 228th qpwoeirut 0 77 20ms 45 hours ago 228th btjones0 0 77 19ms 42 hours ago 228th ComradeSquirrel 0 77 18ms 40 hours ago 228th bzijlema 🇳🇱 0 77 18ms 39 hours ago 228th Lv0Sys 🇵🇱 0 77 18ms 13 hours ago 248th jameswmccarty 0 78 20ms 29 Mar 2025 248th DialFrost 🇸🇬 0 78 3ms 10 May 2025 248th solisolu 0 78 20ms 10 Nov 2025 251st BREMAUCY 🇫🇷 0 79 18ms 2 days ago 251st Andrey2001 0 79 18ms 2 days ago 251st edsrzf 🇳🇿 0 79 30ms 39 hours ago 251st madex 🇩🇪 0 79 416ms 26 hours ago 251st mishak-sys 0 79 411ms 10 hours ago 256th Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 256th error256 0 80 466ms 16 Jan 2026 256th stefangimmillaro 0 80 19ms 44 hours ago 256th albanian-laundromat 0 80 29ms 43 hours ago 260th Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 260th Lv0Sys 🇵🇱 0 81 437ms 10 hours ago 260th Aquateraneal 🇺🇸 0 81 19ms 66 mins ago 263rd bricknellj 0 82 17ms 30 Jan 2025 263rd scpchicken 🇵🇼 0 82 402ms 3 days ago 263rd KatieLG 🇬🇧 0 82 18ms 3 days ago 263rd madex 🇩🇪 0 82 4ms 2 days ago 263rd MeWhenI 🇻🇦 0 82 114ms 25 hours ago 263rd solisolu 0 82 4ms 12 hours ago 269th GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 269th GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 269th error256 0 83 430ms 12 Jan 2026 269th albanian-laundromat 0 83 9ms 26 Jan 2026 269th edsrzf 🇳🇿 0 83 473ms 42 hours ago 269th edsrzf 🇳🇿 0 83 1,251ms 41 hours ago 269th edsrzf 🇳🇿 0 83 106ms 14 hours ago 269th Steffan153 🇫🇮 0 83 416ms 9 hours ago 277th Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 277th edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 277th albanian-laundromat 0 85 92ms 6 Dec 2025 277th GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 277th edsrzf 🇳🇿 0 85 28ms 40 hours ago 282nd kg583 🇺🇸 0 86 23ms 2 Oct 2025 282nd GolfingSuccess 🇬🇷 0 86 2,109ms 17 days ago 284th sean-niemann 🇺🇸 0 87 42ms 9 May 2025 284th error256 0 87 2,931ms 14 Jan 2026 284th IanUtley 0 87 2,957ms 16 Jan 2026 284th CaedenHarper 🇨🇦 0 87 439ms 2 days ago 288th muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 288th albanian-laundromat 0 88 1,372ms 5 Jan 2026 290th Shanethegamer 🇺🇸 0 89 99ms 13 Dec 2024 290th GolfingSuccess 🇬🇷 0 89 64ms 12 Jan 2026 292nd sean-niemann 🇺🇸 0 90 7ms 10 May 2025 293rd ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 293rd error256 0 91 62ms 12 Jan 2026 293rd error256 0 91 293ms 14 Jan 2026 293rd GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 293rd Natanaelel 🇸🇪 0 91 333ms 2 days ago 293rd Steffan153 🇫🇮 0 91 59ms 9 hours ago 299th Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 299th Yax42 🇫🇷 0 92 68ms 2 days ago 299th edsrzf 🇳🇿 0 92 18ms 17 hours ago 302nd Yax42 🇫🇷 0 93 392ms 2 days ago 303rd Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 303rd edsrzf 🇳🇿 0 94 459ms 20 May 2025 303rd MeWhenI 🇻🇦 0 94 396ms 28 hours ago 303rd edsrzf 🇳🇿 0 94 6ms 22 hours ago 303rd albanian-laundromat 0 94 6ms 22 hours ago 308th albanian-laundromat 0 95 114ms 6 Jan 2026 309th Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 309th CaedenHarper 🇨🇦 0 96 416ms 2 days ago 309th edsrzf 🇳🇿 0 96 32ms 2 days ago 309th kumavale 0 96 155ms 20 hours ago 313th albanian-laundromat 0 97 44ms 6 Dec 2025 313th tomh1012 0 97 396ms 2 days ago 315th error256 0 98 156ms 16 Jan 2026 315th albanian-laundromat 0 98 135ms 23 Feb 2026 315th edsrzf 🇳🇿 0 98 163ms 22 hours ago 318th Shanethegamer 🇺🇸 0 99 352ms 24 Sep 2025 319th edsrzf 🇳🇿 0 100 145ms 9 May 2025 319th emgordon154 0 100 7ms 9 May 2025 First Prev 241–320 of 368 Next Last