The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 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 316th Steffan153 🇫🇮 0 91 59ms 3 days ago 322nd Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 322nd Yax42 🇫🇷 0 92 68ms 5 days ago 322nd edsrzf 🇳🇿 0 92 18ms 3 days ago 325th Yax42 🇫🇷 0 93 392ms 5 days ago 326th Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 326th edsrzf 🇳🇿 0 94 459ms 20 May 2025 326th MeWhenI 🇻🇦 0 94 396ms 4 days ago 326th edsrzf 🇳🇿 0 94 6ms 3 days ago 326th albanian-laundromat 0 94 6ms 3 days ago 326th madex 🇩🇪 0 94 99ms 25 hours ago 332nd albanian-laundromat 0 95 114ms 6 Jan 2026 333rd Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 333rd CaedenHarper 🇨🇦 0 96 416ms 4 days ago 333rd edsrzf 🇳🇿 0 96 32ms 4 days ago 333rd kumavale 0 96 160ms 3 days ago 337th albanian-laundromat 0 97 44ms 6 Dec 2025 337th tomh1012 0 97 396ms 5 days ago 339th error256 0 98 155ms 16 Jan 2026 339th albanian-laundromat 0 98 135ms 23 Feb 2026 339th edsrzf 🇳🇿 0 98 157ms 3 days ago 342nd Shanethegamer 🇺🇸 0 99 352ms 24 Sep 2025 342nd madex 🇩🇪 0 99 19ms 26 hours ago 344th edsrzf 🇳🇿 0 100 145ms 9 May 2025 344th JOrE20 0 100 42ms 15 Dec 2025 344th madex 🇩🇪 0 100 113ms 25 hours ago 344th h3ra993huskp 🇯🇵 0 100 392ms 17 hours ago 348th rucin93 🇵🇱 0 101 373ms 24 days ago 348th madex 🇩🇪 0 101 141ms 27 hours ago 350th fantaize 0 102 150ms 19 days ago 350th emgordon154 0 102 4ms 4 days ago 350th madex 🇩🇪 0 102 156ms 2 days ago 353rd Jacob385 0 103 386ms 27 hours ago 354th CLOStrophobic 🇮🇹 0 104 21ms 18 Jan 2025 354th kasarino 0 104 4ms 4 days ago 356th kg583 🇺🇸 0 106 38ms 9 May 2025 357th Shanethegamer 🇺🇸 0 107 8ms 9 May 2025 357th AlephSquirrel 0 107 20ms 14 May 2025 359th CLOStrophobic 🇮🇹 0 108 47ms 17 Feb 2025 359th edsrzf 🇳🇿 0 108 1,839ms 21 May 2025 359th albanian-laundromat 0 108 31ms 5 Jan 2026 359th albanian-laundromat 0 108 83ms 20 days ago 363rd kg583 🇺🇸 0 109 43ms 26 days ago 363rd GolfingSuccess 🇬🇷 0 109 46ms 26 days ago 363rd edsrzf 🇳🇿 0 109 43ms 4 days ago 363rd edsrzf 🇳🇿 0 109 35ms 3 days ago 367th retrohun 0 111 41ms 5 days ago 368th GolfingSuccess 🇬🇷 0 112 44ms 24 Jan 2026 369th Shanethegamer 🇺🇸 0 114 1,281ms 9 May 2025 369th error256 0 114 513ms 29 Jan 2026 369th edsrzf 🇳🇿 0 114 489ms 3 days ago 372nd emgordon154 0 115 80ms 2 days ago 373rd GolfingSuccess 🇬🇷 0 117 283ms 12 Jan 2026 373rd albanian-laundromat 0 117 43ms 18 days ago 375th MeWhenI 🇻🇦 0 118 281ms 44 hours ago 375th elgan65536 🇺🇸 0 118 162ms 3 hours ago 377th madex 🇩🇪 0 119 1,373ms 25 hours ago 378th CaedenHarper 🇨🇦 0 120 274ms 4 days ago 378th emgordon154 0 120 65ms 4 days ago 380th Shanethegamer 🇺🇸 0 121 148ms 13 Dec 2024 380th madex 🇩🇪 0 121 8ms 25 hours ago 382nd albanian-laundromat 0 122 264ms 5 Jan 2026 383rd stefangimmillaro 0 124 298ms 10 May 2025 383rd Shanethegamer 🇺🇸 0 124 147ms 3 Jun 2025 383rd madex 🇩🇪 0 124 272ms 26 hours ago 386th AstroOrbis 0 126 23ms 12 Aug 2025 386th btjones0 0 126 168ms 4 days ago 388th madex 🇩🇪 0 129 366ms 2 days ago 389th JDiLenarda 🇫🇷 0 131 1,330ms 4 days ago 390th HumanoidCPU 0 133 165ms 4 days ago 391st edsrzf 🇳🇿 0 136 4,806ms 19 May 2025 392nd GolfingSuccess 🇬🇷 0 137 93ms 3 days ago 393rd Shanethegamer 🇺🇸 0 139 309ms 13 Dec 2024 393rd UnderKoen 🇳🇱 0 139 1,178ms 4 days ago 395th canissimia 🇦🇶 0 145 14ms 2 days ago 396th Shanethegamer 🇺🇸 0 146 31ms 9 May 2025 397th michelebastione 🇮🇹 0 155 2,026ms 5 hours ago 398th madex 🇩🇪 0 170 36ms 25 hours ago 399th emgordon154 0 185 1,780ms 3 days ago 400th albanian-laundromat 0 192 201ms 2 days ago First Prev 321–400 of 404 Next Last