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 Encoder 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 1st namelessiw 0 5 160ms 13 Oct 2025 1st Shanethegamer 🇺🇸 0 5 210ms 20 Oct 2025 1st GolfingSuccess 🇬🇷 0 5 156ms 13 Dec 2025 4th GolfingSuccess 🇬🇷 0 6 269ms 14 May 2025 4th kg583 🇺🇸 0 6 262ms 14 May 2025 4th JOrE20 0 6 277ms 25 days ago 7th Natanaelel 🇸🇪 0 7 56ms 2 May 2025 7th 2bular 0 7 62ms 2 May 2025 7th Shanethegamer 🇺🇸 0 7 56ms 30 May 2025 7th darrenks 🇺🇸 0 7 53ms 19 hours ago 11th ovs-code 🇩🇪 0 8 61ms 12 Oct 2025 12th plcc0 0 10 58ms 13 mins ago 13th GolfingSuccess 🇬🇷 0 13 158ms 8 May 2025 13th Shanethegamer 🇺🇸 0 13 148ms 30 May 2025 15th saito-ta 🇯🇵 0 17 94ms 9 May 2025 15th ovs-code 🇩🇪 0 17 3ms 12 Oct 2025 15th 2bular 0 17 4ms 12 Oct 2025 15th SirBogman 🇺🇸 0 17 4ms 12 Oct 2025 15th GolfingSuccess 🇬🇷 0 17 80ms 13 Dec 2025 20th GolfingSuccess 🇬🇷 0 18 6ms 13 Dec 2025 21st pardouin 🇫🇷 0 19 91ms 25 Feb 2025 21st MeWhenI 🇻🇦 0 19 79ms 8 May 2025 21st emgordon154 0 19 84ms 22 Nov 2025 21st CaedenHarper 🇨🇦 0 19 80ms 3 days ago 25th fuzzylojik-golf 🇺🇸 0 20 79ms 33 hours ago 26th JOrE20 0 24 91ms 13 Feb 2026 27th Shanethegamer 🇺🇸 0 25 10ms 1 Jun 2025 28th Shanethegamer 🇺🇸 0 27 4ms 26 Nov 2024 28th Natanaelel 🇸🇪 0 27 6ms 8 May 2025 28th saito-ta 🇯🇵 0 27 4ms 8 May 2025 28th Natanaelel 🇸🇪 0 27 4ms 11 May 2025 28th GolfingSuccess 🇬🇷 0 27 4ms 2 days ago 28th fuzzylojik-golf 🇺🇸 0 27 4ms 34 hours ago 34th bitsandbeyond 🇳🇱 0 30 383ms 20 Oct 2025 34th 2bular 0 30 40ms 16 Nov 2025 34th ovs-code 🇩🇪 0 30 37ms 16 Nov 2025 34th IISResetMe 0 30 401ms 10 Jan 2026 34th GolfingSuccess 🇬🇷 0 30 493ms 4 Feb 2026 34th Natanaelel 🇸🇪 0 30 100ms 27 hours ago 40th Shanethegamer 🇺🇸 0 32 102ms 26 Nov 2024 40th DialFrost 🇸🇬 0 32 166ms 24 Feb 2025 40th fuzzylojik-golf 🇺🇸 0 32 98ms 32 hours ago 40th Natanaelel 🇸🇪 0 32 37ms 25 hours ago 40th Steffan153 🇫🇮 0 32 176ms 8 hours ago 45th Shanethegamer 🇺🇸 0 33 43ms 9 Dec 2024 45th stefangimmillaro 0 33 36ms 24 Jan 2025 45th radarek 🇵🇱 0 33 38ms 17 Feb 2025 45th DialFrost 🇸🇬 0 33 37ms 24 Feb 2025 45th error256 0 33 38ms 12 Apr 2025 45th MeWhenI 🇻🇦 0 33 36ms 15 Apr 2025 45th Natanaelel 🇸🇪 0 33 37ms 2 May 2025 45th sean-niemann 🇺🇸 0 33 37ms 8 May 2025 45th GolfingSuccess 🇬🇷 0 33 40ms 8 May 2025 45th pardouin 🇫🇷 0 33 41ms 15 Feb 2026 45th Steffan153 🇫🇮 0 33 37ms 19 Feb 2026 45th CaedenHarper 🇨🇦 0 33 41ms 2 days ago 45th emgordon154 0 33 39ms 31 hours ago 45th Andriamanitra 🇫🇮 0 33 42ms 16 hours ago 59th SirBogman 🇺🇸 0 34 37ms 9 Oct 2025 59th fuzzylojik-golf 🇺🇸 0 34 35ms 34 hours ago 59th Matter1024 🇮🇳 0 34 38ms 24 hours ago 59th anter69 🇭🇺 0 34 38ms 17 hours ago 63rd BREMAUCY 🇫🇷 0 35 36ms 22 hours ago 64th fuzzylojik-golf 🇺🇸 0 36 35ms 33 hours ago 65th JOrE20 0 37 252ms 9 Dec 2025 66th HumanoidCPU 0 38 36ms 2 hours ago 67th error256 0 40 1,440ms 12 Apr 2025 67th Shanethegamer 🇺🇸 0 40 1,476ms 30 Apr 2025 67th sean-niemann 🇺🇸 0 40 1,463ms 8 May 2025 67th GolfingSuccess 🇬🇷 0 40 1,433ms 8 May 2025 67th pardouin 🇫🇷 0 40 1,420ms 15 Feb 2026 67th emgordon154 0 40 1,438ms 31 hours ago 67th stefangimmillaro 0 40 1,401ms 10 hours ago 74th GolfingSuccess 🇬🇷 0 41 16ms 8 Aug 2025 74th fuzzylojik-golf 🇺🇸 0 41 1,376ms 36 hours ago 76th ovs-code 🇩🇪 0 42 81ms 30 May 2025 76th anter69 🇭🇺 0 42 1,272ms 17 hours ago 78th sean-niemann 🇺🇸 0 43 8ms 8 May 2025 78th targrik 0 43 9ms 3 Sep 2025 80th Shanethegamer 🇺🇸 0 44 12ms 10 Dec 2024 1–80 of 376 Next Last