The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 161st btnlq 0 70 193ms 4 Dec 2024 161st kg583 🇺🇸 0 70 128ms 3 Oct 2025 161st error256 0 70 133ms 15 Jan 2026 161st error256 0 70 18ms 12 days ago 165th GolfingSuccess 🇬🇷 0 71 4ms 12 Jan 2026 165th GolfingSuccess 🇬🇷 0 71 24ms 12 Jan 2026 165th GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 165th ovs-code 🇩🇪 0 71 134ms 20 hours ago 165th edsrzf 🇳🇿 0 71 18ms 13 hours ago 165th kg583 🇺🇸 0 71 18ms 11 hours ago 165th rhdqor213 0 71 4ms 6 hours ago 172nd rucin93 🇵🇱 0 72 9ms 18 days ago 172nd aksyristos 0 72 247ms 13 days ago 172nd blaztoma 🇱🇹 0 72 123ms 24 hours ago 172nd Emutis 🇱🇹 0 72 121ms 23 hours ago 172nd KasperKivimaeki 🇫🇮 0 72 4ms 19 hours ago 172nd edsrzf 🇳🇿 0 72 9ms 5 hours ago 178th IISResetMe 0 73 310ms 10 Jan 2026 179th saito-ta 🇯🇵 0 74 3ms 11 May 2025 179th error256 0 74 3ms 12 Jan 2026 179th dokutan 0 74 65ms 8 Feb 2026 179th lukegustafson 🇺🇸 0 74 189ms 16 days ago 179th albanian-laundromat 0 74 9ms 8 days ago 184th Shanethegamer 🇺🇸 0 75 71ms 7 May 2025 184th Natanaelel 🇸🇪 0 75 19ms 11 May 2025 184th commandz0 🇺🇸 0 75 1,210ms 27 Aug 2025 184th albanian-laundromat 0 75 108ms 5 Jan 2026 184th albanian-laundromat 0 75 455ms 6 Jan 2026 184th GolfingSuccess 🇬🇷 0 75 18ms 11 Jan 2026 184th albanian-laundromat 0 75 238ms 22 days ago 184th madex 🇩🇪 0 75 18ms 6 days ago 184th CaedenHarper 🇨🇦 0 75 149ms 3 days ago 184th Yax42 🇫🇷 0 75 4ms 20 hours ago 184th edsrzf 🇳🇿 0 75 17ms 6 hours ago 195th Shanethegamer 🇺🇸 0 76 129ms 13 Dec 2024 195th ovs-code 🇩🇪 0 76 3ms 10 May 2025 195th AlephSquirrel 0 76 43ms 3 Dec 2025 195th AlephSquirrel 0 76 445ms 3 Dec 2025 195th albanian-laundromat 0 76 18ms 22 days ago 195th albanian-laundromat 0 76 188ms 16 days ago 195th MeWhenI 🇻🇦 0 76 586ms 9 days ago 202nd Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 202nd DialFrost 🇸🇬 0 77 19ms 8 May 2025 202nd Natanaelel 🇸🇪 0 77 3ms 11 May 2025 202nd addmai 0 77 20ms 24 Jul 2025 202nd hiichbindermax 0 77 19ms 17 Aug 2025 202nd 5cw 🇺🇸 0 77 18ms 22 Aug 2025 202nd davecame 0 77 150ms 25 Sep 2025 202nd SirBogman 🇺🇸 0 77 240ms 13 Oct 2025 202nd jtaxen 0 77 19ms 16 Oct 2025 202nd albanian-laundromat 0 77 412ms 6 Dec 2025 202nd Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 202nd KasperKivimaeki 🇫🇮 0 77 564ms 9 days ago 202nd StefanHabel 🇨🇦 0 77 1,207ms 33 hours ago 202nd ahmetdemirag 🇨🇾 0 77 18ms 27 hours ago 202nd tomh1012 0 77 17ms 26 hours ago 202nd qpwoeirut 0 77 20ms 11 hours ago 202nd btjones0 0 77 19ms 8 hours ago 202nd ComradeSquirrel 0 77 18ms 7 hours ago 202nd bzijlema 🇳🇱 0 77 18ms 5 hours ago 221st jameswmccarty 0 78 20ms 29 Mar 2025 221st DialFrost 🇸🇬 0 78 940ms 10 May 2025 221st DialFrost 🇸🇬 0 78 3ms 10 May 2025 221st solisolu 0 78 20ms 10 Nov 2025 225th BREMAUCY 🇫🇷 0 79 18ms 29 hours ago 225th Andrey2001 0 79 18ms 23 hours ago 225th edsrzf 🇳🇿 0 79 30ms 5 hours ago 228th Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 228th error256 0 80 466ms 16 Jan 2026 228th madex 🇩🇪 0 80 378ms 32 hours ago 228th stefangimmillaro 0 80 19ms 10 hours ago 228th albanian-laundromat 0 80 28ms 9 hours ago 233rd Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 234th bricknellj 0 82 17ms 30 Jan 2025 234th scpchicken 🇵🇼 0 82 402ms 39 hours ago 234th KatieLG 🇬🇧 0 82 18ms 39 hours ago 234th madex 🇩🇪 0 82 4ms 32 hours ago 238th GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 238th GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 238th error256 0 83 430ms 12 Jan 2026 First Prev 161–240 of 326 Next Last