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 78th emgordon154 0 50 1,258ms 2 days ago 78th MeWhenI 🇻🇦 0 50 7ms 18 hours ago 78th edsrzf 🇳🇿 0 50 1,364ms 9 hours ago 84th lukegustafson 🇺🇸 0 51 42ms 16 Jun 2025 84th GolfingSuccess 🇬🇷 0 51 35ms 12 Jan 2026 84th sean-niemann 🇺🇸 0 51 34ms 15 Jan 2026 84th Steffan153 🇫🇮 0 51 33ms 19 Feb 2026 84th rucin93 🇵🇱 0 51 33ms 19 days ago 84th Natanaelel 🇸🇪 0 51 34ms 2 days ago 84th CaedenHarper 🇨🇦 0 51 882ms 42 hours ago 91st Shanethegamer 🇺🇸 0 52 1,314ms 13 Dec 2024 91st Lv0Sys 🇵🇱 0 52 13ms 6 hours ago 93rd albanian-laundromat 0 53 840ms 6 Dec 2025 93rd pardouin 🇫🇷 0 53 2,732ms 19 Feb 2026 93rd edsrzf 🇳🇿 0 53 2,777ms 36 hours ago 96th Shanethegamer 🇺🇸 0 54 41ms 13 Dec 2024 96th error256 0 54 28ms 2 May 2025 96th albanian-laundromat 0 54 2,676ms 18 Feb 2026 96th emgordon154 0 54 41ms 2 days ago 96th MeWhenI 🇻🇦 0 54 50ms 38 hours ago 96th ComradeSquirrel 0 54 40ms 33 hours ago 96th helbling 🇨🇭 0 54 33ms 22 hours ago 103rd error256 0 55 2,813ms 15 Feb 2026 103rd DialFrost 🇸🇬 0 55 13ms 109 mins ago 105th kg583 🇺🇸 0 56 562ms 1 Dec 2024 105th GolfingSuccess 🇬🇷 0 56 9ms 14 Jan 2026 105th kg583 🇺🇸 0 56 9ms 14 Jan 2026 105th GolfingSuccess 🇬🇷 0 56 488ms 22 Jan 2026 105th Steffan153 🇫🇮 0 56 447ms 19 Feb 2026 105th edsrzf 🇳🇿 0 56 9ms 46 hours ago 105th CaedenHarper 🇨🇦 0 56 12ms 43 hours ago 105th MeWhenI 🇻🇦 0 56 13ms 13 hours ago 113th edsrzf 🇳🇿 0 57 14ms 10 May 2025 113th pardouin 🇫🇷 0 57 572ms 14 Feb 2026 113th GolfingSuccess 🇬🇷 0 57 213ms 17 days ago 113th rucin93 🇵🇱 0 57 211ms 17 days ago 117th sean-niemann 🇺🇸 0 58 163ms 15 Jan 2026 118th lifthrasiir 🇰🇷 0 59 572ms 11 Dec 2024 118th ovs-code 🇩🇪 0 59 413ms 23 Feb 2025 118th error256 0 59 68ms 13 Jan 2026 118th madex 🇩🇪 0 59 2,743ms 5 days ago 122nd khvdm 0 60 144ms 13 Jan 2025 122nd emgordon154 0 60 379ms 9 May 2025 122nd albanian-laundromat 0 60 369ms 22 Feb 2026 122nd sean-niemann 🇺🇸 0 60 458ms 4 days ago 122nd Seek64 🇩🇪 0 60 125ms 2 days ago 122nd HumanoidCPU 0 60 562ms 42 hours ago 128th voytxt 🇨🇿 0 61 28ms 1 Jan 2026 128th albanian-laundromat 0 61 13ms 22 days ago 128th aksyristos 0 61 13ms 8 days ago 131st Andrey-Plotnikov 0 62 36ms 12 Jan 2025 131st XenThe 🇬🇧 0 62 16ms 15 Jul 2025 131st pardouin 🇫🇷 0 62 192ms 14 Feb 2026 131st Steffan153 🇫🇮 0 62 200ms 21 Feb 2026 131st JOrE20 0 62 29ms 27 days ago 131st edsrzf 🇳🇿 0 62 111ms 33 hours ago 137th kg583 🇺🇸 0 63 904ms 1 Dec 2024 137th hallvabo 🇳🇴 0 63 150ms 30 Dec 2024 137th Shanethegamer 🇺🇸 0 63 198ms 7 May 2025 137th sean-niemann 🇺🇸 0 63 7ms 9 May 2025 137th rucin93 🇵🇱 0 63 7ms 10 May 2025 137th edsrzf 🇳🇿 0 63 6ms 10 May 2025 137th targrik 0 63 7ms 8 Oct 2025 137th GolfingSuccess 🇬🇷 0 63 7ms 12 Jan 2026 137th fuzzylojik-golf 🇺🇸 0 63 142ms 2 days ago 137th plcc0 0 63 20ms 27 hours ago 137th plcc0 0 63 382ms 8 hours ago 148th CornerMercury 🇬🇧 0 64 19ms 3 Dec 2024 148th ndren 0 64 18ms 3 Dec 2024 148th lifthrasiir 🇰🇷 0 64 182ms 11 Dec 2024 148th emgordon154 0 64 19ms 9 May 2025 148th error256 0 64 4,375ms 15 Jan 2026 148th anter69 🇭🇺 0 64 19ms 4 Feb 2026 148th albanian-laundromat 0 64 18ms 22 Feb 2026 148th albanian-laundromat 0 64 547ms 23 Feb 2026 148th HumanoidCPU 0 64 256ms 42 hours ago 157th Shanethegamer 🇺🇸 0 65 257ms 13 Dec 2024 157th GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 157th dokutan 0 65 359ms 14 Feb 2026 160th dokutan 0 66 19ms 18 Aug 2025 First Prev 81–160 of 361 Next Last