The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 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 80th GolfingSuccess 🇬🇷 0 51 35ms 12 Jan 2026 80th sean-niemann 🇺🇸 0 51 34ms 15 Jan 2026 80th Steffan153 🇫🇮 0 51 33ms 19 Feb 2026 80th rucin93 🇵🇱 0 51 33ms 19 days ago 80th Natanaelel 🇸🇪 0 51 34ms 44 hours ago 80th CaedenHarper 🇨🇦 0 51 882ms 35 hours ago 87th Shanethegamer 🇺🇸 0 52 1,314ms 13 Dec 2024 88th albanian-laundromat 0 53 840ms 6 Dec 2025 88th pardouin 🇫🇷 0 53 2,732ms 19 Feb 2026 88th edsrzf 🇳🇿 0 53 2,777ms 28 hours ago 91st Shanethegamer 🇺🇸 0 54 41ms 13 Dec 2024 91st error256 0 54 28ms 2 May 2025 91st albanian-laundromat 0 54 2,676ms 18 Feb 2026 91st emgordon154 0 54 41ms 2 days ago 91st MeWhenI 🇻🇦 0 54 50ms 31 hours ago 91st ComradeSquirrel 0 54 40ms 25 hours ago 91st helbling 🇨🇭 0 54 33ms 15 hours ago 98th error256 0 55 2,813ms 15 Feb 2026 99th kg583 🇺🇸 0 56 562ms 1 Dec 2024 99th GolfingSuccess 🇬🇷 0 56 9ms 14 Jan 2026 99th kg583 🇺🇸 0 56 9ms 14 Jan 2026 99th GolfingSuccess 🇬🇷 0 56 488ms 22 Jan 2026 99th Steffan153 🇫🇮 0 56 447ms 19 Feb 2026 99th edsrzf 🇳🇿 0 56 9ms 39 hours ago 99th CaedenHarper 🇨🇦 0 56 12ms 35 hours ago 99th MeWhenI 🇻🇦 0 56 13ms 5 hours ago 107th edsrzf 🇳🇿 0 57 14ms 10 May 2025 107th pardouin 🇫🇷 0 57 572ms 14 Feb 2026 107th GolfingSuccess 🇬🇷 0 57 213ms 17 days ago 107th rucin93 🇵🇱 0 57 211ms 16 days ago 111th sean-niemann 🇺🇸 0 58 163ms 15 Jan 2026 112th lifthrasiir 🇰🇷 0 59 572ms 11 Dec 2024 112th ovs-code 🇩🇪 0 59 413ms 23 Feb 2025 112th error256 0 59 68ms 13 Jan 2026 112th madex 🇩🇪 0 59 2,743ms 5 days ago 116th khvdm 0 60 144ms 13 Jan 2025 116th emgordon154 0 60 379ms 9 May 2025 116th albanian-laundromat 0 60 369ms 22 Feb 2026 116th sean-niemann 🇺🇸 0 60 458ms 4 days ago 116th Seek64 🇩🇪 0 60 125ms 43 hours ago 116th HumanoidCPU 0 60 562ms 35 hours ago 122nd DialFrost 🇸🇬 0 61 34ms 24 Feb 2025 122nd voytxt 🇨🇿 0 61 28ms 1 Jan 2026 122nd albanian-laundromat 0 61 13ms 22 days ago 122nd aksyristos 0 61 13ms 7 days ago 126th Andrey-Plotnikov 0 62 36ms 12 Jan 2025 126th XenThe 🇬🇧 0 62 16ms 15 Jul 2025 126th pardouin 🇫🇷 0 62 192ms 14 Feb 2026 126th Steffan153 🇫🇮 0 62 200ms 21 Feb 2026 126th JOrE20 0 62 29ms 26 days ago 126th edsrzf 🇳🇿 0 62 111ms 26 hours ago 132nd kg583 🇺🇸 0 63 904ms 1 Dec 2024 132nd hallvabo 🇳🇴 0 63 150ms 30 Dec 2024 132nd Shanethegamer 🇺🇸 0 63 198ms 7 May 2025 132nd sean-niemann 🇺🇸 0 63 7ms 9 May 2025 132nd rucin93 🇵🇱 0 63 7ms 10 May 2025 132nd edsrzf 🇳🇿 0 63 6ms 10 May 2025 132nd targrik 0 63 7ms 8 Oct 2025 132nd GolfingSuccess 🇬🇷 0 63 7ms 12 Jan 2026 132nd fuzzylojik-golf 🇺🇸 0 63 142ms 2 days ago 132nd plcc0 0 63 20ms 19 hours ago 132nd plcc0 0 63 382ms 83 mins ago 143rd CornerMercury 🇬🇧 0 64 19ms 3 Dec 2024 143rd ndren 0 64 18ms 3 Dec 2024 143rd lifthrasiir 🇰🇷 0 64 182ms 11 Dec 2024 143rd emgordon154 0 64 19ms 9 May 2025 143rd error256 0 64 4,375ms 15 Jan 2026 143rd anter69 🇭🇺 0 64 19ms 4 Feb 2026 143rd albanian-laundromat 0 64 18ms 22 Feb 2026 143rd albanian-laundromat 0 64 547ms 23 Feb 2026 143rd HumanoidCPU 0 64 256ms 35 hours ago 152nd Shanethegamer 🇺🇸 0 65 257ms 13 Dec 2024 152nd GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 152nd dokutan 0 65 359ms 14 Feb 2026 155th dokutan 0 66 19ms 18 Aug 2025 155th Yax42 🇫🇷 0 66 470ms 6 Jan 2026 155th AdrienHache 🇫🇷 0 66 430ms 6 Jan 2026 155th GolfingSuccess 🇬🇷 0 66 10ms 12 Jan 2026 155th edsrzf 🇳🇿 0 66 11ms 28 hours ago 155th Steffan153 🇫🇮 0 66 10ms 4 hours ago First Prev 81–160 of 349 Next Last