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 214th blaztoma 🇱🇹 0 62 15ms 2 days ago 214th Emutis 🇱🇹 0 62 16ms 2 days ago 214th Andrey2001 0 62 16ms 2 days ago 214th anter69 🇭🇺 0 62 15ms 2 days ago 214th qpwoeirut 0 62 17ms 42 hours ago 214th stefangimmillaro 0 62 16ms 41 hours ago 214th btjones0 0 62 15ms 40 hours ago 214th bzijlema 🇳🇱 0 62 16ms 36 hours ago 214th ahmetdemirag 🇨🇾 0 62 15ms 33 hours ago 214th Pyroan 0 62 19ms 27 hours ago 214th edsrzf 🇳🇿 0 62 15ms 25 hours ago 214th zacjl 0 62 17ms 18 hours ago 214th MeWhenI 🇻🇦 0 62 86ms 17 hours ago 214th ComradeSquirrel 0 62 14ms 15 hours ago 214th duckyluuk 🇳🇱 0 62 15ms 9 hours ago 256th sean-niemann 🇺🇸 0 63 43ms 8 May 2025 256th albanian-laundromat 0 63 44ms 14 Jan 2026 256th tomh1012 0 63 15ms 2 days ago 256th MeWhenI 🇻🇦 0 63 204ms 26 hours ago 256th mishak-sys 0 63 15ms 8 hours ago 261st jameswmccarty 0 64 15ms 29 Mar 2025 261st dokutan 0 64 63ms 8 Feb 2026 261st albanian-laundromat 0 64 188ms 4 days ago 261st zgialor-lab 0 64 16ms 29 hours ago 265th JDiLenarda 🇫🇷 0 65 1,347ms 32 hours ago 266th Shanethegamer 🇺🇸 0 66 1,317ms 26 Nov 2024 266th rucin93 🇵🇱 0 66 6ms 8 May 2025 266th sean-niemann 🇺🇸 0 66 7ms 8 May 2025 266th AdrienHache 🇫🇷 0 66 421ms 2 Nov 2025 266th namelessiw 0 66 474ms 2 Nov 2025 266th GolfingSuccess 🇬🇷 0 66 430ms 4 Feb 2026 266th albanian-laundromat 0 66 1,345ms 4 days ago 266th Yax42 🇫🇷 0 66 484ms 3 days ago 266th fuzzylojik-golf 🇺🇸 0 66 456ms 2 days ago 266th edsrzf 🇳🇿 0 66 7ms 41 hours ago 266th edsrzf 🇳🇿 0 66 1,345ms 25 hours ago 266th edsrzf 🇳🇿 0 66 451ms 13 hours ago 266th Steffan153 🇫🇮 0 66 480ms 6 hours ago 266th Steffan153 🇫🇮 0 66 7ms 111 mins ago 280th GolfingSuccess 🇬🇷 0 67 12ms 8 May 2025 280th tomh1012 0 67 429ms 2 days ago 282nd Shanethegamer 🇺🇸 0 68 145ms 26 Nov 2024 282nd sean-niemann 🇺🇸 0 68 131ms 8 May 2025 282nd edsrzf 🇳🇿 0 68 113ms 25 May 2025 282nd GolfingSuccess 🇬🇷 0 68 110ms 3 days ago 282nd fuzzylojik-golf 🇺🇸 0 68 1,320ms 30 hours ago 282nd Steffan153 🇫🇮 0 68 104ms 6 hours ago 288th GolfingSuccess 🇬🇷 0 69 10ms 8 May 2025 288th CaedenHarper 🇨🇦 0 69 486ms 4 days ago 290th JOrE20 0 70 41ms 13 Feb 2026 291st kg583 🇺🇸 0 71 27ms 1 Dec 2024 291st CLOStrophobic 🇮🇹 0 71 13ms 18 Jan 2025 291st GolfingSuccess 🇬🇷 0 71 14ms 7 May 2025 291st edsrzf 🇳🇿 0 71 14ms 8 May 2025 291st AlephSquirrel 0 71 13ms 9 May 2025 296th Shanethegamer 🇺🇸 0 72 27ms 9 Dec 2024 297th GolfingSuccess 🇬🇷 0 73 16ms 8 May 2025 297th GolfingSuccess 🇬🇷 0 73 8ms 24 hours ago 299th not-a-pokemon 0 74 15ms 30 hours ago 300th Shanethegamer 🇺🇸 0 75 99ms 26 Nov 2024 300th sean-niemann 🇺🇸 0 75 103ms 8 May 2025 300th HumanoidCPU 0 75 112ms 34 hours ago 303rd GolfingSuccess 🇬🇷 0 76 133ms 28 Nov 2025 303rd fuzzylojik-golf 🇺🇸 0 76 99ms 2 days ago 303rd edsrzf 🇳🇿 0 76 131ms 2 days ago 303rd emgordon154 0 76 115ms 41 hours ago 303rd MeWhenI 🇻🇦 0 76 98ms 26 hours ago 308th rucin93 🇵🇱 0 77 130ms 8 May 2025 308th Shanethegamer 🇺🇸 0 77 146ms 12 Nov 2025 308th edsrzf 🇳🇿 0 77 7ms 26 hours ago 308th GolfingSuccess 🇬🇷 0 77 8ms 24 hours ago 308th Steffan153 🇫🇮 0 77 7ms 100 mins ago 313th saito-ta 🇯🇵 0 78 4ms 10 May 2025 313th rhdqor213 0 78 4ms 10 May 2025 313th albanian-laundromat 0 78 93ms 4 days ago 313th fuzzylojik-golf 🇺🇸 0 78 8ms 31 hours ago 313th edsrzf 🇳🇿 0 78 425ms 25 hours ago 318th sean-niemann 🇺🇸 0 80 455ms 8 May 2025 319th kumavale 0 81 156ms 26 Nov 2025 319th Matter1024 🇮🇳 0 81 45ms 14 Feb 2026 First Prev 241–320 of 446 Next Last