The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Gray Code Encoder in all languages in bytes. 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 Bytes Time Submitted 69th AdrienHache 🇫🇷 0 44 60ms 5 Feb 2026 69th voytxt 🇨🇿 0 44 41ms 6 Feb 2026 69th Steffan153 🇫🇮 0 44 28ms 19 Feb 2026 69th CaedenHarper 🇨🇦 0 44 12ms 32 hours ago 69th fuzzylojik-golf 🇺🇸 0 44 13ms 7 hours ago 69th fuzzylojik-golf 🇺🇸 0 44 9ms 7 hours ago 87th Andrey-Plotnikov 0 45 12ms 10 Jan 2025 87th saito-ta 🇯🇵 0 45 555ms 10 May 2025 87th XenThe 🇬🇧 0 45 12ms 15 Jul 2025 87th smclaughlin-cf 0 45 12ms 14 Oct 2025 87th albanian-laundromat 0 45 13ms 2 days ago 92nd Shanethegamer 🇺🇸 0 46 377ms 26 Nov 2024 92nd lyphyser 0 46 51ms 11 Feb 2025 92nd Shanethegamer 🇺🇸 0 46 8ms 30 Apr 2025 92nd GolfingSuccess 🇬🇷 0 46 7ms 8 May 2025 92nd rucin93 🇵🇱 0 46 8ms 11 May 2025 92nd edsrzf 🇳🇿 0 46 7ms 10 hours ago 98th kg583 🇺🇸 0 50 470ms 1 Dec 2024 98th Shanethegamer 🇺🇸 0 50 471ms 10 Dec 2024 98th GolfingSuccess 🇬🇷 0 50 460ms 30 Dec 2024 98th ovs-code 🇩🇪 0 50 448ms 23 Feb 2025 98th pardouin 🇫🇷 0 50 433ms 24 Feb 2025 98th emgordon154 0 50 424ms 9 May 2025 98th Steffan153 🇫🇮 0 50 378ms 25 days ago 98th CaedenHarper 🇨🇦 0 50 733ms 2 days ago 98th Steffan153 🇫🇮 0 50 776ms 2 days ago 98th edsrzf 🇳🇿 0 50 872ms 2 days ago 98th GolfingSuccess 🇬🇷 0 50 854ms 33 hours ago 98th fuzzylojik-golf 🇺🇸 0 50 420ms 10 hours ago 110th lifthrasiir 🇰🇷 0 51 433ms 11 Dec 2024 110th Shanethegamer 🇺🇸 0 51 5ms 30 Apr 2025 110th GolfingSuccess 🇬🇷 0 51 157ms 8 May 2025 110th rucin93 🇵🇱 0 51 159ms 8 May 2025 110th Shanethegamer 🇺🇸 0 51 150ms 8 May 2025 110th sean-niemann 🇺🇸 0 51 150ms 9 May 2025 110th DialFrost 🇸🇬 0 51 324ms 8 Sep 2025 117th DialFrost 🇸🇬 0 52 474ms 17 Feb 2025 117th CaedenHarper 🇨🇦 0 52 530ms 2 days ago 117th albanian-laundromat 0 52 5ms 2 days ago 120th antimon2 🇯🇵 0 53 288ms 16 Dec 2024 120th Shanethegamer 🇺🇸 0 53 315ms 1 Feb 2025 120th dokutan 0 53 426ms 15 Aug 2025 120th MeWhenI 🇻🇦 0 53 393ms 21 Nov 2025 120th albanian-laundromat 0 53 467ms 15 Jan 2026 120th AlephSquirrel 0 53 383ms 39 hours ago 126th Shanethegamer 🇺🇸 0 54 69ms 12 Dec 2024 126th DialFrost 🇸🇬 0 54 269ms 17 Feb 2025 126th error256 0 54 66ms 12 Apr 2025 126th albanian-laundromat 0 54 779ms 15 Jan 2026 126th GolfingSuccess 🇬🇷 0 54 71ms 33 hours ago 131st albanian-laundromat 0 55 39ms 2 days ago 132nd Shanethegamer 🇺🇸 0 56 66ms 30 Apr 2025 132nd GolfingSuccess 🇬🇷 0 56 70ms 8 May 2025 132nd sean-niemann 🇺🇸 0 56 67ms 8 May 2025 132nd DialFrost 🇸🇬 0 56 2,628ms 16 Dec 2025 136th Shanethegamer 🇺🇸 0 57 326ms 25 May 2025 136th sean-niemann 🇺🇸 0 57 176ms 25 May 2025 136th edsrzf 🇳🇿 0 57 167ms 25 May 2025 136th GolfingSuccess 🇬🇷 0 57 171ms 13 Dec 2025 136th Matter1024 🇮🇳 0 57 68ms 13 Feb 2026 136th albanian-laundromat 0 57 296ms 20 hours ago 142nd GolfingSuccess 🇬🇷 0 58 4,218ms 8 May 2025 143rd GolfingSuccess 🇬🇷 0 59 17ms 8 May 2025 143rd IanUtley 0 59 18ms 8 May 2025 143rd GolfingSuccess 🇬🇷 0 59 63ms 8 May 2025 143rd Natanaelel 🇸🇪 0 59 36ms 16 Nov 2025 147th pardouin 🇫🇷 0 60 2,725ms 15 Feb 2026 147th fuzzylojik-golf 🇺🇸 0 60 16ms 8 hours ago 149th GolfingSuccess 🇬🇷 0 61 2,468ms 8 May 2025 149th madex 🇩🇪 0 61 2,598ms 3 days ago 151st lifthrasiir 🇰🇷 0 62 37ms 22 Nov 2024 151st GolfingSuccess 🇬🇷 0 62 15ms 25 Nov 2024 151st AlephSquirrel 0 62 15ms 25 Nov 2024 151st hallvabo 🇳🇴 0 62 38ms 26 Nov 2024 151st kg583 🇺🇸 0 62 36ms 1 Dec 2024 151st CornerMercury 🇬🇧 0 62 15ms 3 Dec 2024 151st ndren 0 62 15ms 3 Dec 2024 151st btnlq 0 62 15ms 4 Dec 2024 151st Shanethegamer 🇺🇸 0 62 16ms 10 Dec 2024 151st Artemis21 🇬🇧 0 62 16ms 24 Dec 2024 First Prev 81–160 of 320 Next Last