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 237th hiichbindermax 0 77 19ms 17 Aug 2025 237th 5cw 🇺🇸 0 77 18ms 22 Aug 2025 237th davecame 0 77 135ms 25 Sep 2025 237th SirBogman 🇺🇸 0 77 232ms 13 Oct 2025 237th jtaxen 0 77 19ms 16 Oct 2025 237th albanian-laundromat 0 77 412ms 6 Dec 2025 237th Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 237th KasperKivimaeki 🇫🇮 0 77 564ms 11 days ago 237th StefanHabel 🇨🇦 0 77 1,217ms 3 days ago 237th ahmetdemirag 🇨🇾 0 77 18ms 3 days ago 237th tomh1012 0 77 17ms 3 days ago 237th qpwoeirut 0 77 20ms 2 days ago 237th btjones0 0 77 19ms 2 days ago 237th ComradeSquirrel 0 77 18ms 2 days ago 237th bzijlema 🇳🇱 0 77 18ms 2 days ago 237th Lv0Sys 🇵🇱 0 77 18ms 34 hours ago 257th jameswmccarty 0 78 20ms 29 Mar 2025 257th DialFrost 🇸🇬 0 78 3ms 10 May 2025 257th solisolu 0 78 20ms 10 Nov 2025 257th madex 🇩🇪 0 78 3ms 13 hours ago 261st BREMAUCY 🇫🇷 0 79 18ms 3 days ago 261st Andrey2001 0 79 18ms 3 days ago 261st edsrzf 🇳🇿 0 79 30ms 2 days ago 261st mishak-sys 0 79 411ms 31 hours ago 265th Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 265th error256 0 80 466ms 16 Jan 2026 265th stefangimmillaro 0 80 19ms 2 days ago 265th albanian-laundromat 0 80 29ms 2 days ago 269th Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 269th Lv0Sys 🇵🇱 0 81 437ms 31 hours ago 269th Aquateraneal 🇺🇸 0 81 19ms 21 hours ago 269th luuumine 🇫🇷 0 81 16ms 7 hours ago 269th acollett89 0 81 14ms 4 hours ago 274th bricknellj 0 82 17ms 30 Jan 2025 274th scpchicken 🇵🇼 0 82 402ms 3 days ago 274th KatieLG 🇬🇧 0 82 18ms 3 days ago 274th MeWhenI 🇻🇦 0 82 105ms 46 hours ago 274th solisolu 0 82 4ms 32 hours ago 279th GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 279th GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 279th error256 0 83 430ms 12 Jan 2026 279th albanian-laundromat 0 83 9ms 26 Jan 2026 279th edsrzf 🇳🇿 0 83 473ms 2 days ago 279th edsrzf 🇳🇿 0 83 1,251ms 2 days ago 279th edsrzf 🇳🇿 0 83 106ms 35 hours ago 279th Steffan153 🇫🇮 0 83 416ms 29 hours ago 279th msbranicky 0 83 18ms 3 hours ago 288th Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 288th edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 288th albanian-laundromat 0 85 98ms 6 Dec 2025 288th GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 288th edsrzf 🇳🇿 0 85 28ms 2 days ago 293rd kg583 🇺🇸 0 86 23ms 2 Oct 2025 293rd GolfingSuccess 🇬🇷 0 86 2,109ms 18 days ago 295th sean-niemann 🇺🇸 0 87 42ms 9 May 2025 295th error256 0 87 2,931ms 14 Jan 2026 295th IanUtley 0 87 2,957ms 16 Jan 2026 295th CaedenHarper 🇨🇦 0 87 439ms 2 days ago 295th madex 🇩🇪 0 87 13ms 13 hours ago 300th muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 300th albanian-laundromat 0 88 1,372ms 5 Jan 2026 302nd Shanethegamer 🇺🇸 0 89 107ms 13 Dec 2024 302nd GolfingSuccess 🇬🇷 0 89 64ms 12 Jan 2026 304th sean-niemann 🇺🇸 0 90 7ms 10 May 2025 305th ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 305th error256 0 91 62ms 12 Jan 2026 305th error256 0 91 293ms 14 Jan 2026 305th GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 305th Natanaelel 🇸🇪 0 91 333ms 3 days ago 305th Steffan153 🇫🇮 0 91 59ms 29 hours ago 311th Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 311th Yax42 🇫🇷 0 92 68ms 3 days ago 311th edsrzf 🇳🇿 0 92 18ms 37 hours ago 314th Yax42 🇫🇷 0 93 392ms 3 days ago 315th Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 315th edsrzf 🇳🇿 0 94 459ms 20 May 2025 315th MeWhenI 🇻🇦 0 94 396ms 2 days ago 315th edsrzf 🇳🇿 0 94 6ms 43 hours ago 315th albanian-laundromat 0 94 6ms 42 hours ago 320th albanian-laundromat 0 95 114ms 6 Jan 2026 First Prev 241–320 of 382 Next Last