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 240th GolfingSuccess 🇬🇷 0 86 2,109ms 15 days ago 242nd sean-niemann 🇺🇸 0 87 42ms 9 May 2025 242nd error256 0 87 2,931ms 14 Jan 2026 242nd IanUtley 0 87 2,957ms 16 Jan 2026 242nd CaedenHarper 🇨🇦 0 87 439ms 8 hours ago 246th edsrzf 🇳🇿 0 88 2,094ms 15 May 2025 246th muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 246th solisolu 0 88 3ms 11 Nov 2025 246th albanian-laundromat 0 88 1,372ms 5 Jan 2026 246th edsrzf 🇳🇿 0 88 26ms 11 hours ago 251st Shanethegamer 🇺🇸 0 89 99ms 13 Dec 2024 251st GolfingSuccess 🇬🇷 0 89 64ms 12 Jan 2026 253rd sean-niemann 🇺🇸 0 90 7ms 10 May 2025 254th ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 254th error256 0 91 62ms 12 Jan 2026 254th error256 0 91 293ms 14 Jan 2026 254th GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 254th Natanaelel 🇸🇪 0 91 333ms 16 hours ago 259th Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 259th Yax42 🇫🇷 0 92 68ms 13 hours ago 261st Yax42 🇫🇷 0 93 392ms 14 hours ago 262nd Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 262nd edsrzf 🇳🇿 0 94 459ms 20 May 2025 264th albanian-laundromat 0 95 114ms 6 Jan 2026 265th Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 265th albanian-laundromat 0 96 5ms 6 Dec 2025 265th MeWhenI 🇻🇦 0 96 399ms 9 days ago 265th CaedenHarper 🇨🇦 0 96 416ms 9 hours ago 265th edsrzf 🇳🇿 0 96 32ms 9 hours ago 270th albanian-laundromat 0 97 44ms 6 Dec 2025 270th tomh1012 0 97 396ms 19 hours ago 272nd kumavale 0 98 155ms 26 Nov 2025 272nd error256 0 98 156ms 16 Jan 2026 272nd albanian-laundromat 0 98 135ms 23 Feb 2026 275th edsrzf 🇳🇿 0 99 468ms 9 May 2025 275th Shanethegamer 🇺🇸 0 99 352ms 24 Sep 2025 277th edsrzf 🇳🇿 0 100 145ms 9 May 2025 277th emgordon154 0 100 7ms 9 May 2025 277th JOrE20 0 100 42ms 15 Dec 2025 280th rucin93 🇵🇱 0 101 373ms 19 days ago 281st fantaize 0 102 148ms 14 days ago 281st emgordon154 0 102 4ms 4 hours ago 283rd CLOStrophobic 🇮🇹 0 104 21ms 18 Jan 2025 284th kg583 🇺🇸 0 106 38ms 9 May 2025 285th Shanethegamer 🇺🇸 0 107 8ms 9 May 2025 285th AlephSquirrel 0 107 20ms 14 May 2025 287th CLOStrophobic 🇮🇹 0 108 47ms 17 Feb 2025 287th edsrzf 🇳🇿 0 108 1,839ms 21 May 2025 287th albanian-laundromat 0 108 31ms 5 Jan 2026 287th albanian-laundromat 0 108 83ms 15 days ago 291st kg583 🇺🇸 0 109 43ms 22 days ago 291st GolfingSuccess 🇬🇷 0 109 46ms 21 days ago 291st edsrzf 🇳🇿 0 109 43ms 2 hours ago 294th retrohun 0 111 41ms 17 hours ago 295th GolfingSuccess 🇬🇷 0 112 44ms 24 Jan 2026 296th Shanethegamer 🇺🇸 0 114 1,281ms 9 May 2025 296th error256 0 114 513ms 29 Jan 2026 298th GolfingSuccess 🇬🇷 0 117 269ms 12 Jan 2026 298th albanian-laundromat 0 117 43ms 14 days ago 300th edsrzf 🇳🇿 0 118 715ms 9 May 2025 301st CaedenHarper 🇨🇦 0 120 274ms 9 hours ago 301st emgordon154 0 120 65ms 4 hours ago 303rd Shanethegamer 🇺🇸 0 121 148ms 13 Dec 2024 303rd elgan65536 🇺🇸 0 121 178ms 9 Feb 2026 305th albanian-laundromat 0 122 264ms 5 Jan 2026 306th stefangimmillaro 0 124 298ms 10 May 2025 306th Shanethegamer 🇺🇸 0 124 150ms 3 Jun 2025 308th AstroOrbis 0 126 23ms 12 Aug 2025 308th btjones0 0 126 168ms 57 mins ago 310th HumanoidCPU 0 133 160ms 6 hours ago 311th edsrzf 🇳🇿 0 136 4,806ms 19 May 2025 312th Shanethegamer 🇺🇸 0 139 309ms 13 Dec 2024 313th GolfingSuccess 🇬🇷 0 140 93ms 46 mins ago 314th Shanethegamer 🇺🇸 0 146 31ms 9 May 2025 315th albanian-laundromat 0 207 1,444ms 6 Jan 2026 316th albanian-laundromat 0 221 194ms 41 hours ago 317th albanian-laundromat 0 265 68ms 8 Dec 2025 First Prev 241–317 of 317
