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 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 26 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 43 hours ago 7th plcc0 0 7 55ms 6 hours ago 12th ovs-code 🇩🇪 0 8 61ms 12 Oct 2025 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 4ms 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 15th fuzzylojik-golf 🇺🇸 0 17 87ms 21 hours ago 15th zacjl 0 17 4ms 8 hours ago 22nd GolfingSuccess 🇬🇷 0 18 6ms 13 Dec 2025 23rd pardouin 🇫🇷 0 19 91ms 25 Feb 2025 23rd MeWhenI 🇻🇦 0 19 79ms 8 May 2025 23rd emgordon154 0 19 84ms 22 Nov 2025 23rd CaedenHarper 🇨🇦 0 19 80ms 4 days ago 23rd plcc0 0 19 82ms 22 hours ago 28th Pyroan 0 22 92ms 16 hours ago 29th JOrE20 0 24 91ms 13 Feb 2026 30th Shanethegamer 🇺🇸 0 25 10ms 1 Jun 2025 31st plcc0 0 26 6ms 7 hours ago 32nd Shanethegamer 🇺🇸 0 27 4ms 26 Nov 2024 32nd Natanaelel 🇸🇪 0 27 6ms 8 May 2025 32nd saito-ta 🇯🇵 0 27 4ms 8 May 2025 32nd Natanaelel 🇸🇪 0 27 4ms 11 May 2025 32nd GolfingSuccess 🇬🇷 0 27 4ms 3 days ago 32nd fuzzylojik-golf 🇺🇸 0 27 4ms 2 days ago 38th emgordon154 0 28 7ms 9 hours ago 39th bitsandbeyond 🇳🇱 0 30 383ms 20 Oct 2025 39th 2bular 0 30 40ms 16 Nov 2025 39th ovs-code 🇩🇪 0 30 37ms 16 Nov 2025 39th IISResetMe 0 30 401ms 10 Jan 2026 39th GolfingSuccess 🇬🇷 0 30 493ms 4 Feb 2026 39th Natanaelel 🇸🇪 0 30 100ms 2 days ago 39th Solathian 0 30 5ms 3 mins ago 46th Shanethegamer 🇺🇸 0 32 102ms 26 Nov 2024 46th DialFrost 🇸🇬 0 32 166ms 24 Feb 2025 46th fuzzylojik-golf 🇺🇸 0 32 98ms 2 days ago 46th Natanaelel 🇸🇪 0 32 37ms 2 days ago 46th Steffan153 🇫🇮 0 32 176ms 32 hours ago 51st Shanethegamer 🇺🇸 0 33 43ms 9 Dec 2024 51st stefangimmillaro 0 33 36ms 24 Jan 2025 51st radarek 🇵🇱 0 33 38ms 17 Feb 2025 51st DialFrost 🇸🇬 0 33 37ms 24 Feb 2025 51st error256 0 33 38ms 12 Apr 2025 51st MeWhenI 🇻🇦 0 33 35ms 15 Apr 2025 51st Natanaelel 🇸🇪 0 33 37ms 2 May 2025 51st sean-niemann 🇺🇸 0 33 37ms 8 May 2025 51st GolfingSuccess 🇬🇷 0 33 40ms 8 May 2025 51st pardouin 🇫🇷 0 33 41ms 15 Feb 2026 51st Steffan153 🇫🇮 0 33 37ms 19 Feb 2026 51st CaedenHarper 🇨🇦 0 33 41ms 3 days ago 51st emgordon154 0 33 39ms 2 days ago 51st Andriamanitra 🇫🇮 0 33 42ms 40 hours ago 51st fuzzylojik-golf 🇺🇸 0 33 37ms 18 hours ago 66th SirBogman 🇺🇸 0 34 37ms 9 Oct 2025 66th Matter1024 🇮🇳 0 34 38ms 2 days ago 66th anter69 🇭🇺 0 34 38ms 41 hours ago 66th fuzzylojik-golf 🇺🇸 0 34 36ms 21 hours ago 66th edsrzf 🇳🇿 0 34 37ms 9 hours ago 71st BREMAUCY 🇫🇷 0 35 36ms 46 hours ago 72nd JOrE20 0 37 252ms 9 Dec 2025 73rd HumanoidCPU 0 38 36ms 27 hours ago 74th error256 0 40 1,440ms 12 Apr 2025 74th Shanethegamer 🇺🇸 0 40 1,476ms 30 Apr 2025 74th sean-niemann 🇺🇸 0 40 1,463ms 8 May 2025 74th GolfingSuccess 🇬🇷 0 40 1,433ms 8 May 2025 74th pardouin 🇫🇷 0 40 1,420ms 15 Feb 2026 74th emgordon154 0 40 1,438ms 2 days ago 74th stefangimmillaro 0 40 1,401ms 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