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 239th KatieLG 🇬🇧 0 82 18ms 47 hours ago 239th madex 🇩🇪 0 82 4ms 40 hours ago 243rd GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 243rd GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 243rd error256 0 83 430ms 12 Jan 2026 243rd albanian-laundromat 0 83 9ms 26 Jan 2026 243rd edsrzf 🇳🇿 0 83 473ms 16 hours ago 243rd edsrzf 🇳🇿 0 83 1,251ms 15 hours ago 249th Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 249th edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 249th albanian-laundromat 0 85 92ms 6 Dec 2025 249th GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 249th edsrzf 🇳🇿 0 85 28ms 14 hours ago 254th kg583 🇺🇸 0 86 23ms 2 Oct 2025 254th GolfingSuccess 🇬🇷 0 86 2,109ms 16 days ago 256th sean-niemann 🇺🇸 0 87 42ms 9 May 2025 256th error256 0 87 2,931ms 14 Jan 2026 256th IanUtley 0 87 2,957ms 16 Jan 2026 256th CaedenHarper 🇨🇦 0 87 439ms 23 hours ago 260th muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 260th solisolu 0 88 3ms 11 Nov 2025 260th albanian-laundromat 0 88 1,372ms 5 Jan 2026 263rd Shanethegamer 🇺🇸 0 89 99ms 13 Dec 2024 263rd GolfingSuccess 🇬🇷 0 89 64ms 12 Jan 2026 265th sean-niemann 🇺🇸 0 90 7ms 10 May 2025 266th ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 266th error256 0 91 62ms 12 Jan 2026 266th error256 0 91 293ms 14 Jan 2026 266th GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 266th Natanaelel 🇸🇪 0 91 333ms 31 hours ago 271st Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 271st Yax42 🇫🇷 0 92 68ms 29 hours ago 273rd Yax42 🇫🇷 0 93 392ms 29 hours ago 274th Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 274th edsrzf 🇳🇿 0 94 459ms 20 May 2025 274th MeWhenI 🇻🇦 0 94 396ms 2 hours ago 277th albanian-laundromat 0 95 114ms 6 Jan 2026 278th Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 278th albanian-laundromat 0 96 5ms 6 Dec 2025 278th CaedenHarper 🇨🇦 0 96 416ms 25 hours ago 278th edsrzf 🇳🇿 0 96 32ms 24 hours ago 282nd albanian-laundromat 0 97 44ms 6 Dec 2025 282nd tomh1012 0 97 396ms 34 hours ago 284th kumavale 0 98 155ms 26 Nov 2025 284th error256 0 98 156ms 16 Jan 2026 284th albanian-laundromat 0 98 135ms 23 Feb 2026 287th edsrzf 🇳🇿 0 99 468ms 9 May 2025 287th Shanethegamer 🇺🇸 0 99 352ms 24 Sep 2025 289th edsrzf 🇳🇿 0 100 145ms 9 May 2025 289th emgordon154 0 100 7ms 9 May 2025 289th JOrE20 0 100 42ms 15 Dec 2025 292nd rucin93 🇵🇱 0 101 373ms 20 days ago 293rd fantaize 0 102 148ms 15 days ago 293rd emgordon154 0 102 4ms 19 hours ago 295th CLOStrophobic 🇮🇹 0 104 21ms 18 Jan 2025 295th kasarino 0 104 4ms 4 hours ago 297th kg583 🇺🇸 0 106 38ms 9 May 2025 298th Shanethegamer 🇺🇸 0 107 8ms 9 May 2025 298th AlephSquirrel 0 107 20ms 14 May 2025 300th CLOStrophobic 🇮🇹 0 108 47ms 17 Feb 2025 300th edsrzf 🇳🇿 0 108 1,839ms 21 May 2025 300th albanian-laundromat 0 108 31ms 5 Jan 2026 300th albanian-laundromat 0 108 83ms 16 days ago 304th kg583 🇺🇸 0 109 43ms 22 days ago 304th GolfingSuccess 🇬🇷 0 109 46ms 22 days ago 304th edsrzf 🇳🇿 0 109 43ms 17 hours ago 307th retrohun 0 111 41ms 32 hours ago 308th GolfingSuccess 🇬🇷 0 112 44ms 24 Jan 2026 309th Shanethegamer 🇺🇸 0 114 1,281ms 9 May 2025 309th error256 0 114 513ms 29 Jan 2026 311th GolfingSuccess 🇬🇷 0 117 269ms 12 Jan 2026 311th albanian-laundromat 0 117 43ms 14 days ago 311th edsrzf 🇳🇿 0 117 284ms 25 mins ago 314th CaedenHarper 🇨🇦 0 120 274ms 25 hours ago 314th emgordon154 0 120 65ms 19 hours ago 316th Shanethegamer 🇺🇸 0 121 148ms 13 Dec 2024 316th elgan65536 🇺🇸 0 121 178ms 9 Feb 2026 318th albanian-laundromat 0 122 264ms 5 Jan 2026 319th stefangimmillaro 0 124 298ms 10 May 2025 319th Shanethegamer 🇺🇸 0 124 150ms 3 Jun 2025 First Prev 241–320 of 333 Next Last