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 81st Shanethegamer 🇺🇸 0 54 39ms 13 Dec 2024 81st error256 0 54 25ms 2 May 2025 81st albanian-laundromat 0 54 2,676ms 18 Feb 2026 81st emgordon154 0 54 33ms 27 hours ago 81st MeWhenI 🇻🇦 0 54 50ms 6 hours ago 81st ComradeSquirrel 0 54 41ms 31 mins ago 87th error256 0 55 2,813ms 15 Feb 2026 88th kg583 🇺🇸 0 56 562ms 1 Dec 2024 88th GolfingSuccess 🇬🇷 0 56 9ms 14 Jan 2026 88th kg583 🇺🇸 0 56 9ms 14 Jan 2026 88th GolfingSuccess 🇬🇷 0 56 488ms 22 Jan 2026 88th Steffan153 🇫🇮 0 56 447ms 19 Feb 2026 88th edsrzf 🇳🇿 0 56 9ms 14 hours ago 88th helbling 🇨🇭 0 56 40ms 13 hours ago 88th CaedenHarper 🇨🇦 0 56 14ms 10 hours ago 96th edsrzf 🇳🇿 0 57 13ms 10 May 2025 96th pardouin 🇫🇷 0 57 572ms 14 Feb 2026 96th GolfingSuccess 🇬🇷 0 57 213ms 15 days ago 96th rucin93 🇵🇱 0 57 211ms 15 days ago 96th MeWhenI 🇻🇦 0 57 37ms 6 hours ago 101st sean-niemann 🇺🇸 0 58 163ms 15 Jan 2026 102nd lifthrasiir 🇰🇷 0 59 572ms 11 Dec 2024 102nd ovs-code 🇩🇪 0 59 413ms 23 Feb 2025 102nd error256 0 59 68ms 13 Jan 2026 102nd madex 🇩🇪 0 59 2,743ms 4 days ago 106th khvdm 0 60 144ms 13 Jan 2025 106th emgordon154 0 60 379ms 9 May 2025 106th albanian-laundromat 0 60 369ms 22 Feb 2026 106th sean-niemann 🇺🇸 0 60 458ms 3 days ago 106th Seek64 🇩🇪 0 60 125ms 17 hours ago 106th HumanoidCPU 0 60 562ms 10 hours ago 112th DialFrost 🇸🇬 0 61 25ms 24 Feb 2025 112th voytxt 🇨🇿 0 61 62ms 1 Jan 2026 112th albanian-laundromat 0 61 26ms 21 days ago 112th aksyristos 0 61 11ms 6 days ago 116th Andrey-Plotnikov 0 62 36ms 12 Jan 2025 116th XenThe 🇬🇧 0 62 11ms 15 Jul 2025 116th pardouin 🇫🇷 0 62 192ms 14 Feb 2026 116th Steffan153 🇫🇮 0 62 200ms 21 Feb 2026 116th JOrE20 0 62 28ms 25 days ago 116th edsrzf 🇳🇿 0 62 111ms 48 mins ago 122nd kg583 🇺🇸 0 63 904ms 1 Dec 2024 122nd hallvabo 🇳🇴 0 63 150ms 30 Dec 2024 122nd Shanethegamer 🇺🇸 0 63 198ms 7 May 2025 122nd sean-niemann 🇺🇸 0 63 7ms 9 May 2025 122nd rucin93 🇵🇱 0 63 7ms 10 May 2025 122nd edsrzf 🇳🇿 0 63 6ms 10 May 2025 122nd targrik 0 63 7ms 8 Oct 2025 122nd GolfingSuccess 🇬🇷 0 63 7ms 12 Jan 2026 122nd fuzzylojik-golf 🇺🇸 0 63 142ms 33 hours ago 131st CornerMercury 🇬🇧 0 64 19ms 3 Dec 2024 131st ndren 0 64 18ms 3 Dec 2024 131st lifthrasiir 🇰🇷 0 64 182ms 11 Dec 2024 131st emgordon154 0 64 19ms 9 May 2025 131st error256 0 64 4,375ms 15 Jan 2026 131st anter69 🇭🇺 0 64 19ms 4 Feb 2026 131st albanian-laundromat 0 64 18ms 22 Feb 2026 131st albanian-laundromat 0 64 547ms 23 Feb 2026 131st HumanoidCPU 0 64 256ms 10 hours ago 140th Shanethegamer 🇺🇸 0 65 257ms 13 Dec 2024 140th GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 140th dokutan 0 65 359ms 14 Feb 2026 143rd dokutan 0 66 19ms 18 Aug 2025 143rd Yax42 🇫🇷 0 66 470ms 6 Jan 2026 143rd AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 143rd GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 143rd edsrzf 🇳🇿 0 66 11ms 3 hours ago 148th Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 148th Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 148th namelessiw 0 67 407ms 2 Nov 2025 148th error256 0 67 111ms 30 Jan 2026 148th CaedenHarper 🇨🇦 0 67 553ms 3 days ago 148th fuzzylojik-golf 🇺🇸 0 67 490ms 33 hours ago 154th Yax42 🇫🇷 0 68 12ms 17 hours ago 155th 4atj 0 69 1,159ms 21 May 2025 155th GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 155th error256 0 69 410ms 2 days ago 155th edsrzf 🇳🇿 0 69 394ms 2 hours ago 159th btnlq 0 70 193ms 4 Dec 2024 159th kg583 🇺🇸 0 70 128ms 3 Oct 2025 First Prev 81–160 of 321 Next Last