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 234th SirBogman 🇺🇸 0 77 232ms 13 Oct 2025 234th jtaxen 0 77 19ms 16 Oct 2025 234th albanian-laundromat 0 77 412ms 6 Dec 2025 234th Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 234th KasperKivimaeki 🇫🇮 0 77 564ms 11 days ago 234th StefanHabel 🇨🇦 0 77 1,217ms 3 days ago 234th ahmetdemirag 🇨🇾 0 77 18ms 3 days ago 234th tomh1012 0 77 17ms 3 days ago 234th qpwoeirut 0 77 20ms 2 days ago 234th btjones0 0 77 19ms 2 days ago 234th ComradeSquirrel 0 77 18ms 2 days ago 234th bzijlema 🇳🇱 0 77 18ms 2 days ago 234th Lv0Sys 🇵🇱 0 77 18ms 27 hours ago 254th jameswmccarty 0 78 20ms 29 Mar 2025 254th DialFrost 🇸🇬 0 78 3ms 10 May 2025 254th solisolu 0 78 20ms 10 Nov 2025 254th madex 🇩🇪 0 78 3ms 7 hours ago 258th BREMAUCY 🇫🇷 0 79 18ms 3 days ago 258th Andrey2001 0 79 18ms 2 days ago 258th edsrzf 🇳🇿 0 79 30ms 2 days ago 258th mishak-sys 0 79 411ms 25 hours ago 262nd Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 262nd error256 0 80 466ms 16 Jan 2026 262nd stefangimmillaro 0 80 19ms 2 days ago 262nd albanian-laundromat 0 80 29ms 2 days ago 266th Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 266th Lv0Sys 🇵🇱 0 81 437ms 25 hours ago 266th Aquateraneal 🇺🇸 0 81 19ms 15 hours ago 266th luuumine 🇫🇷 0 81 16ms 76 mins ago 270th bricknellj 0 82 17ms 30 Jan 2025 270th scpchicken 🇵🇼 0 82 402ms 3 days ago 270th KatieLG 🇬🇧 0 82 18ms 3 days ago 270th MeWhenI 🇻🇦 0 82 105ms 39 hours ago 270th solisolu 0 82 4ms 26 hours ago 275th GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 275th GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 275th error256 0 83 430ms 12 Jan 2026 275th albanian-laundromat 0 83 9ms 26 Jan 2026 275th edsrzf 🇳🇿 0 83 473ms 2 days ago 275th edsrzf 🇳🇿 0 83 1,251ms 2 days ago 275th edsrzf 🇳🇿 0 83 106ms 28 hours ago 275th Steffan153 🇫🇮 0 83 416ms 23 hours ago 283rd Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 283rd edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 283rd albanian-laundromat 0 85 98ms 6 Dec 2025 283rd GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 283rd edsrzf 🇳🇿 0 85 28ms 2 days ago 288th kg583 🇺🇸 0 86 23ms 2 Oct 2025 288th GolfingSuccess 🇬🇷 0 86 2,109ms 18 days ago 290th sean-niemann 🇺🇸 0 87 42ms 9 May 2025 290th error256 0 87 2,931ms 14 Jan 2026 290th IanUtley 0 87 2,957ms 16 Jan 2026 290th CaedenHarper 🇨🇦 0 87 439ms 2 days ago 290th madex 🇩🇪 0 87 13ms 7 hours ago 295th muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 295th albanian-laundromat 0 88 1,372ms 5 Jan 2026 297th Shanethegamer 🇺🇸 0 89 107ms 13 Dec 2024 297th GolfingSuccess 🇬🇷 0 89 64ms 12 Jan 2026 299th sean-niemann 🇺🇸 0 90 7ms 10 May 2025 300th ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 300th error256 0 91 62ms 12 Jan 2026 300th error256 0 91 293ms 14 Jan 2026 300th GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 300th Natanaelel 🇸🇪 0 91 333ms 3 days ago 300th Steffan153 🇫🇮 0 91 59ms 23 hours ago 306th Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 306th Yax42 🇫🇷 0 92 68ms 2 days ago 306th edsrzf 🇳🇿 0 92 18ms 31 hours ago 309th Yax42 🇫🇷 0 93 392ms 2 days ago 310th Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 310th edsrzf 🇳🇿 0 94 459ms 20 May 2025 310th MeWhenI 🇻🇦 0 94 396ms 43 hours ago 310th edsrzf 🇳🇿 0 94 6ms 36 hours ago 310th albanian-laundromat 0 94 6ms 36 hours ago 315th albanian-laundromat 0 95 114ms 6 Jan 2026 316th Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 316th CaedenHarper 🇨🇦 0 96 416ms 2 days ago 316th edsrzf 🇳🇿 0 96 32ms 2 days ago 316th kumavale 0 96 160ms 35 hours ago 320th albanian-laundromat 0 97 44ms 6 Dec 2025 First Prev 241–320 of 377 Next Last