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 77th MeWhenI 🇻🇦 0 50 7ms 17 hours ago 77th edsrzf 🇳🇿 0 50 1,364ms 8 hours ago 83rd lukegustafson 🇺🇸 0 51 42ms 16 Jun 2025 83rd GolfingSuccess 🇬🇷 0 51 35ms 12 Jan 2026 83rd sean-niemann 🇺🇸 0 51 34ms 15 Jan 2026 83rd Steffan153 🇫🇮 0 51 33ms 19 Feb 2026 83rd rucin93 🇵🇱 0 51 33ms 19 days ago 83rd Natanaelel 🇸🇪 0 51 34ms 2 days ago 83rd CaedenHarper 🇨🇦 0 51 882ms 41 hours ago 90th Shanethegamer 🇺🇸 0 52 1,314ms 13 Dec 2024 90th Lv0Sys 🇵🇱 0 52 13ms 5 hours ago 92nd albanian-laundromat 0 53 840ms 6 Dec 2025 92nd pardouin 🇫🇷 0 53 2,732ms 19 Feb 2026 92nd edsrzf 🇳🇿 0 53 2,777ms 35 hours ago 95th Shanethegamer 🇺🇸 0 54 41ms 13 Dec 2024 95th error256 0 54 28ms 2 May 2025 95th albanian-laundromat 0 54 2,676ms 18 Feb 2026 95th emgordon154 0 54 41ms 2 days ago 95th MeWhenI 🇻🇦 0 54 50ms 37 hours ago 95th ComradeSquirrel 0 54 40ms 32 hours ago 95th helbling 🇨🇭 0 54 33ms 21 hours ago 102nd error256 0 55 2,813ms 15 Feb 2026 102nd DialFrost 🇸🇬 0 55 13ms 52 mins ago 104th kg583 🇺🇸 0 56 562ms 1 Dec 2024 104th GolfingSuccess 🇬🇷 0 56 9ms 14 Jan 2026 104th kg583 🇺🇸 0 56 9ms 14 Jan 2026 104th GolfingSuccess 🇬🇷 0 56 488ms 22 Jan 2026 104th Steffan153 🇫🇮 0 56 447ms 19 Feb 2026 104th edsrzf 🇳🇿 0 56 9ms 45 hours ago 104th CaedenHarper 🇨🇦 0 56 12ms 42 hours ago 104th MeWhenI 🇻🇦 0 56 13ms 12 hours ago 112th edsrzf 🇳🇿 0 57 14ms 10 May 2025 112th pardouin 🇫🇷 0 57 572ms 14 Feb 2026 112th GolfingSuccess 🇬🇷 0 57 213ms 17 days ago 112th rucin93 🇵🇱 0 57 211ms 17 days ago 116th sean-niemann 🇺🇸 0 58 163ms 15 Jan 2026 117th lifthrasiir 🇰🇷 0 59 572ms 11 Dec 2024 117th ovs-code 🇩🇪 0 59 413ms 23 Feb 2025 117th error256 0 59 68ms 13 Jan 2026 117th madex 🇩🇪 0 59 2,743ms 5 days ago 121st khvdm 0 60 144ms 13 Jan 2025 121st emgordon154 0 60 379ms 9 May 2025 121st albanian-laundromat 0 60 369ms 22 Feb 2026 121st sean-niemann 🇺🇸 0 60 458ms 4 days ago 121st Seek64 🇩🇪 0 60 125ms 2 days ago 121st HumanoidCPU 0 60 562ms 41 hours ago 127th voytxt 🇨🇿 0 61 28ms 1 Jan 2026 127th albanian-laundromat 0 61 13ms 22 days ago 127th aksyristos 0 61 13ms 8 days ago 130th Andrey-Plotnikov 0 62 36ms 12 Jan 2025 130th XenThe 🇬🇧 0 62 16ms 15 Jul 2025 130th pardouin 🇫🇷 0 62 192ms 14 Feb 2026 130th Steffan153 🇫🇮 0 62 200ms 21 Feb 2026 130th JOrE20 0 62 29ms 27 days ago 130th edsrzf 🇳🇿 0 62 111ms 32 hours ago 136th kg583 🇺🇸 0 63 904ms 1 Dec 2024 136th hallvabo 🇳🇴 0 63 150ms 30 Dec 2024 136th Shanethegamer 🇺🇸 0 63 198ms 7 May 2025 136th sean-niemann 🇺🇸 0 63 7ms 9 May 2025 136th rucin93 🇵🇱 0 63 7ms 10 May 2025 136th edsrzf 🇳🇿 0 63 6ms 10 May 2025 136th targrik 0 63 7ms 8 Oct 2025 136th GolfingSuccess 🇬🇷 0 63 7ms 12 Jan 2026 136th fuzzylojik-golf 🇺🇸 0 63 142ms 2 days ago 136th plcc0 0 63 20ms 26 hours ago 136th plcc0 0 63 382ms 7 hours ago 147th CornerMercury 🇬🇧 0 64 19ms 3 Dec 2024 147th ndren 0 64 18ms 3 Dec 2024 147th lifthrasiir 🇰🇷 0 64 182ms 11 Dec 2024 147th emgordon154 0 64 19ms 9 May 2025 147th error256 0 64 4,375ms 15 Jan 2026 147th anter69 🇭🇺 0 64 19ms 4 Feb 2026 147th albanian-laundromat 0 64 18ms 22 Feb 2026 147th albanian-laundromat 0 64 547ms 23 Feb 2026 147th HumanoidCPU 0 64 256ms 41 hours ago 156th Shanethegamer 🇺🇸 0 65 257ms 13 Dec 2024 156th GolfingSuccess 🇬🇷 0 65 92ms 12 Jan 2026 156th dokutan 0 65 359ms 14 Feb 2026 159th dokutan 0 66 19ms 18 Aug 2025 159th Yax42 🇫🇷 0 66 470ms 6 Jan 2026 First Prev 81–160 of 360 Next Last