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 241st Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 241st edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 241st albanian-laundromat 0 85 92ms 6 Dec 2025 241st GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 241st edsrzf 🇳🇿 0 85 28ms 53 mins ago 246th kg583 🇺🇸 0 86 23ms 2 Oct 2025 246th GolfingSuccess 🇬🇷 0 86 2,109ms 16 days ago 248th sean-niemann 🇺🇸 0 87 42ms 9 May 2025 248th error256 0 87 2,931ms 14 Jan 2026 248th IanUtley 0 87 2,957ms 16 Jan 2026 248th CaedenHarper 🇨🇦 0 87 439ms 10 hours ago 252nd muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 252nd solisolu 0 88 3ms 11 Nov 2025 252nd albanian-laundromat 0 88 1,372ms 5 Jan 2026 255th Shanethegamer 🇺🇸 0 89 99ms 13 Dec 2024 255th GolfingSuccess 🇬🇷 0 89 64ms 12 Jan 2026 257th sean-niemann 🇺🇸 0 90 7ms 10 May 2025 258th ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 258th error256 0 91 62ms 12 Jan 2026 258th error256 0 91 293ms 14 Jan 2026 258th GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 258th Natanaelel 🇸🇪 0 91 333ms 18 hours ago 263rd Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 263rd Yax42 🇫🇷 0 92 68ms 15 hours ago 265th Yax42 🇫🇷 0 93 392ms 16 hours ago 266th Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 266th edsrzf 🇳🇿 0 94 459ms 20 May 2025 268th albanian-laundromat 0 95 114ms 6 Jan 2026 269th Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 269th albanian-laundromat 0 96 5ms 6 Dec 2025 269th MeWhenI 🇻🇦 0 96 399ms 9 days ago 269th CaedenHarper 🇨🇦 0 96 416ms 11 hours ago 269th edsrzf 🇳🇿 0 96 32ms 11 hours ago 274th albanian-laundromat 0 97 44ms 6 Dec 2025 274th tomh1012 0 97 396ms 21 hours ago 276th kumavale 0 98 155ms 26 Nov 2025 276th error256 0 98 156ms 16 Jan 2026 276th albanian-laundromat 0 98 135ms 23 Feb 2026 279th edsrzf 🇳🇿 0 99 468ms 9 May 2025 279th Shanethegamer 🇺🇸 0 99 352ms 24 Sep 2025 281st edsrzf 🇳🇿 0 100 145ms 9 May 2025 281st emgordon154 0 100 7ms 9 May 2025 281st JOrE20 0 100 42ms 15 Dec 2025 284th rucin93 🇵🇱 0 101 373ms 20 days ago 285th fantaize 0 102 148ms 14 days ago 285th emgordon154 0 102 4ms 6 hours ago 287th CLOStrophobic 🇮🇹 0 104 21ms 18 Jan 2025 288th kg583 🇺🇸 0 106 38ms 9 May 2025 289th Shanethegamer 🇺🇸 0 107 8ms 9 May 2025 289th AlephSquirrel 0 107 20ms 14 May 2025 291st CLOStrophobic 🇮🇹 0 108 47ms 17 Feb 2025 291st edsrzf 🇳🇿 0 108 1,839ms 21 May 2025 291st albanian-laundromat 0 108 31ms 5 Jan 2026 291st albanian-laundromat 0 108 83ms 15 days ago 295th kg583 🇺🇸 0 109 43ms 22 days ago 295th GolfingSuccess 🇬🇷 0 109 46ms 21 days ago 295th edsrzf 🇳🇿 0 109 43ms 4 hours ago 298th retrohun 0 111 41ms 19 hours ago 299th GolfingSuccess 🇬🇷 0 112 44ms 24 Jan 2026 300th Shanethegamer 🇺🇸 0 114 1,281ms 9 May 2025 300th error256 0 114 513ms 29 Jan 2026 302nd GolfingSuccess 🇬🇷 0 117 269ms 12 Jan 2026 302nd albanian-laundromat 0 117 43ms 14 days ago 304th edsrzf 🇳🇿 0 118 715ms 9 May 2025 305th CaedenHarper 🇨🇦 0 120 274ms 11 hours ago 305th emgordon154 0 120 65ms 6 hours ago 307th Shanethegamer 🇺🇸 0 121 148ms 13 Dec 2024 307th elgan65536 🇺🇸 0 121 178ms 9 Feb 2026 309th albanian-laundromat 0 122 264ms 5 Jan 2026 310th stefangimmillaro 0 124 298ms 10 May 2025 310th Shanethegamer 🇺🇸 0 124 150ms 3 Jun 2025 312th AstroOrbis 0 126 23ms 12 Aug 2025 312th btjones0 0 126 168ms 2 hours ago 314th HumanoidCPU 0 133 160ms 7 hours ago 315th edsrzf 🇳🇿 0 136 4,806ms 19 May 2025 316th Shanethegamer 🇺🇸 0 139 309ms 13 Dec 2024 317th GolfingSuccess 🇬🇷 0 140 93ms 2 hours ago 318th Shanethegamer 🇺🇸 0 146 31ms 9 May 2025 319th albanian-laundromat 0 207 1,444ms 6 Jan 2026 320th albanian-laundromat 0 221 194ms 43 hours ago First Prev 241–320 of 321 Next Last