The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 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 27 Feb 2026 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 5 days ago 7th plcc0 0 7 55ms 3 days 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 3ms 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 4 days ago 15th zacjl 0 17 4ms 3 days ago 15th emgordon154 0 17 4ms 6 hours ago 23rd GolfingSuccess 🇬🇷 0 18 6ms 13 Dec 2025 23rd Steffan153 🇫🇮 0 18 7ms 3 days ago 23rd bstrat 0 18 8ms 2 days ago 26th pardouin 🇫🇷 0 19 91ms 25 Feb 2025 26th MeWhenI 🇻🇦 0 19 79ms 8 May 2025 26th emgordon154 0 19 77ms 22 Nov 2025 26th CaedenHarper 🇨🇦 0 19 80ms 7 days ago 26th plcc0 0 19 82ms 4 days ago 26th CornerMercury 🇬🇧 0 19 80ms 2 days ago 32nd fuzzylojik-golf 🇺🇸 0 20 5ms 92 mins ago 33rd Pyroan 0 22 92ms 4 days ago 34th JOrE20 0 24 91ms 13 Feb 2026 35th Shanethegamer 🇺🇸 0 25 10ms 1 Jun 2025 36th plcc0 0 26 6ms 3 days ago 37th Shanethegamer 🇺🇸 0 27 4ms 26 Nov 2024 37th Natanaelel 🇸🇪 0 27 6ms 8 May 2025 37th saito-ta 🇯🇵 0 27 4ms 8 May 2025 37th Natanaelel 🇸🇪 0 27 4ms 11 May 2025 37th GolfingSuccess 🇬🇷 0 27 4ms 6 days ago 37th fuzzylojik-golf 🇺🇸 0 27 4ms 5 days ago 37th Solathian 0 27 4ms 3 days ago 37th Steffan153 🇫🇮 0 27 4ms 3 days ago 37th madex 🇩🇪 0 27 4ms 2 days ago 46th bitsandbeyond 🇳🇱 0 30 383ms 20 Oct 2025 46th 2bular 0 30 40ms 16 Nov 2025 46th ovs-code 🇩🇪 0 30 37ms 16 Nov 2025 46th IISResetMe 0 30 401ms 10 Jan 2026 46th GolfingSuccess 🇬🇷 0 30 493ms 4 Feb 2026 46th Natanaelel 🇸🇪 0 30 100ms 5 days ago 52nd KatieLG 🇬🇧 0 31 17ms 2 days ago 53rd Shanethegamer 🇺🇸 0 32 102ms 26 Nov 2024 53rd DialFrost 🇸🇬 0 32 166ms 24 Feb 2025 53rd fuzzylojik-golf 🇺🇸 0 32 98ms 5 days ago 53rd Natanaelel 🇸🇪 0 32 37ms 5 days ago 53rd Steffan153 🇫🇮 0 32 176ms 4 days ago 53rd madex 🇩🇪 0 32 100ms 2 days ago 59th Shanethegamer 🇺🇸 0 33 43ms 9 Dec 2024 59th stefangimmillaro 0 33 36ms 24 Jan 2025 59th radarek 🇵🇱 0 33 38ms 17 Feb 2025 59th DialFrost 🇸🇬 0 33 37ms 24 Feb 2025 59th error256 0 33 38ms 12 Apr 2025 59th MeWhenI 🇻🇦 0 33 35ms 15 Apr 2025 59th Natanaelel 🇸🇪 0 33 37ms 2 May 2025 59th sean-niemann 🇺🇸 0 33 37ms 8 May 2025 59th GolfingSuccess 🇬🇷 0 33 40ms 8 May 2025 59th pardouin 🇫🇷 0 33 41ms 15 Feb 2026 59th Steffan153 🇫🇮 0 33 37ms 19 Feb 2026 59th CaedenHarper 🇨🇦 0 33 41ms 6 days ago 59th emgordon154 0 33 39ms 5 days ago 59th Andriamanitra 🇫🇮 0 33 42ms 5 days ago 59th fuzzylojik-golf 🇺🇸 0 33 37ms 4 days ago 74th SirBogman 🇺🇸 0 34 37ms 9 Oct 2025 74th Matter1024 🇮🇳 0 34 38ms 5 days ago 74th anter69 🇭🇺 0 34 38ms 5 days ago 74th fuzzylojik-golf 🇺🇸 0 34 36ms 4 days ago 74th edsrzf 🇳🇿 0 34 37ms 3 days ago 74th madex 🇩🇪 0 34 36ms 2 days ago 80th BREMAUCY 🇫🇷 0 35 36ms 5 days ago 1–80 of 503 Next Last