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 83 386ms 12 Jan 2026 240th error256 0 83 430ms 12 Jan 2026 240th albanian-laundromat 0 83 9ms 26 Jan 2026 240th edsrzf 🇳🇿 0 83 473ms 9 hours ago 240th edsrzf 🇳🇿 0 83 1,251ms 7 hours ago 246th Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 246th edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 246th albanian-laundromat 0 85 92ms 6 Dec 2025 246th GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 246th edsrzf 🇳🇿 0 85 28ms 7 hours ago 251st kg583 🇺🇸 0 86 23ms 2 Oct 2025 251st GolfingSuccess 🇬🇷 0 86 2,109ms 16 days ago 253rd sean-niemann 🇺🇸 0 87 42ms 9 May 2025 253rd error256 0 87 2,931ms 14 Jan 2026 253rd IanUtley 0 87 2,957ms 16 Jan 2026 253rd CaedenHarper 🇨🇦 0 87 439ms 16 hours ago 257th muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 257th solisolu 0 88 3ms 11 Nov 2025 257th albanian-laundromat 0 88 1,372ms 5 Jan 2026 260th Shanethegamer 🇺🇸 0 89 99ms 13 Dec 2024 260th GolfingSuccess 🇬🇷 0 89 64ms 12 Jan 2026 262nd sean-niemann 🇺🇸 0 90 7ms 10 May 2025 263rd ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 263rd error256 0 91 62ms 12 Jan 2026 263rd error256 0 91 293ms 14 Jan 2026 263rd GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 263rd Natanaelel 🇸🇪 0 91 333ms 24 hours ago 268th Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 268th Yax42 🇫🇷 0 92 68ms 21 hours ago 270th Yax42 🇫🇷 0 93 392ms 22 hours ago 271st Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 271st edsrzf 🇳🇿 0 94 459ms 20 May 2025 273rd albanian-laundromat 0 95 114ms 6 Jan 2026 274th Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 274th albanian-laundromat 0 96 5ms 6 Dec 2025 274th MeWhenI 🇻🇦 0 96 421ms 9 days ago 274th CaedenHarper 🇨🇦 0 96 416ms 17 hours ago 274th edsrzf 🇳🇿 0 96 32ms 17 hours ago 279th albanian-laundromat 0 97 44ms 6 Dec 2025 279th tomh1012 0 97 396ms 27 hours ago 281st kumavale 0 98 155ms 26 Nov 2025 281st error256 0 98 156ms 16 Jan 2026 281st albanian-laundromat 0 98 135ms 23 Feb 2026 284th edsrzf 🇳🇿 0 99 468ms 9 May 2025 284th Shanethegamer 🇺🇸 0 99 352ms 24 Sep 2025 286th edsrzf 🇳🇿 0 100 145ms 9 May 2025 286th emgordon154 0 100 7ms 9 May 2025 286th JOrE20 0 100 42ms 15 Dec 2025 289th rucin93 🇵🇱 0 101 373ms 20 days ago 290th fantaize 0 102 148ms 14 days ago 290th emgordon154 0 102 4ms 12 hours ago 292nd CLOStrophobic 🇮🇹 0 104 21ms 18 Jan 2025 293rd kg583 🇺🇸 0 106 38ms 9 May 2025 294th Shanethegamer 🇺🇸 0 107 8ms 9 May 2025 294th AlephSquirrel 0 107 20ms 14 May 2025 296th CLOStrophobic 🇮🇹 0 108 47ms 17 Feb 2025 296th edsrzf 🇳🇿 0 108 1,839ms 21 May 2025 296th albanian-laundromat 0 108 31ms 5 Jan 2026 296th albanian-laundromat 0 108 83ms 16 days ago 300th kg583 🇺🇸 0 109 43ms 22 days ago 300th GolfingSuccess 🇬🇷 0 109 46ms 21 days ago 300th edsrzf 🇳🇿 0 109 43ms 10 hours ago 303rd retrohun 0 111 41ms 25 hours ago 304th GolfingSuccess 🇬🇷 0 112 44ms 24 Jan 2026 305th Shanethegamer 🇺🇸 0 114 1,281ms 9 May 2025 305th error256 0 114 513ms 29 Jan 2026 307th GolfingSuccess 🇬🇷 0 117 269ms 12 Jan 2026 307th albanian-laundromat 0 117 43ms 14 days ago 309th edsrzf 🇳🇿 0 118 715ms 9 May 2025 310th CaedenHarper 🇨🇦 0 120 274ms 17 hours ago 310th emgordon154 0 120 65ms 12 hours ago 312th Shanethegamer 🇺🇸 0 121 148ms 13 Dec 2024 312th elgan65536 🇺🇸 0 121 178ms 9 Feb 2026 314th albanian-laundromat 0 122 264ms 5 Jan 2026 315th stefangimmillaro 0 124 298ms 10 May 2025 315th Shanethegamer 🇺🇸 0 124 150ms 3 Jun 2025 317th AstroOrbis 0 126 23ms 12 Aug 2025 317th btjones0 0 126 168ms 9 hours ago 319th JDiLenarda 🇫🇷 0 131 1,330ms 64 mins ago 320th HumanoidCPU 0 133 160ms 14 hours ago First Prev 241–320 of 328 Next Last