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 239th Shanethegamer 🇺🇸 0 77 146ms 12 Nov 2025 242nd saito-ta 🇯🇵 0 78 4ms 10 May 2025 242nd rhdqor213 0 78 4ms 10 May 2025 242nd albanian-laundromat 0 78 100ms 2 days ago 245th GolfingSuccess 🇬🇷 0 79 79ms 14 May 2025 246th sean-niemann 🇺🇸 0 80 455ms 8 May 2025 247th kumavale 0 81 156ms 26 Nov 2025 247th Matter1024 🇮🇳 0 81 45ms 14 Feb 2026 247th albanian-laundromat 0 81 46ms 2 days ago 250th GolfingSuccess 🇬🇷 0 82 502ms 8 May 2025 250th emgordon154 0 82 162ms 14 Feb 2026 252nd Shanethegamer 🇺🇸 0 83 484ms 26 Nov 2024 252nd edsrzf 🇳🇿 0 83 414ms 9 Jul 2025 252nd Shanethegamer 🇺🇸 0 83 403ms 9 Jul 2025 252nd fantaize 0 83 156ms 13 days ago 256th Shanethegamer 🇺🇸 0 84 416ms 26 Nov 2024 256th ovs-code 🇩🇪 0 84 12ms 10 May 2025 256th fuzzylojik-golf 🇺🇸 0 84 444ms 18 hours ago 259th GolfingSuccess 🇬🇷 0 85 46ms 8 May 2025 259th edsrzf 🇳🇿 0 85 42ms 8 May 2025 259th edsrzf 🇳🇿 0 85 18ms 9 May 2025 259th error256 0 85 18ms 10 May 2025 259th GolfingSuccess 🇬🇷 0 85 3ms 14 Jan 2026 264th Shanethegamer 🇺🇸 0 86 147ms 17 Dec 2024 264th kg583 🇺🇸 0 86 39ms 16 Feb 2025 264th GolfingSuccess 🇬🇷 0 86 44ms 7 May 2025 264th GolfingSuccess 🇬🇷 0 86 2,431ms 8 May 2025 264th edsrzf 🇳🇿 0 86 155ms 9 May 2025 264th sean-niemann 🇺🇸 0 86 496ms 25 Sep 2025 264th GolfingSuccess 🇬🇷 0 86 8ms 12 Nov 2025 264th MeWhenI 🇻🇦 0 86 381ms 21 Nov 2025 264th GolfingSuccess 🇬🇷 0 86 399ms 12 Jan 2026 264th elgan65536 🇺🇸 0 86 168ms 23 days ago 264th CaedenHarper 🇨🇦 0 86 399ms 2 days ago 264th CaedenHarper 🇨🇦 0 86 153ms 42 hours ago 276th Shanethegamer 🇺🇸 0 87 42ms 15 Apr 2025 276th GolfingSuccess 🇬🇷 0 87 18ms 8 May 2025 276th Shanethegamer 🇺🇸 0 87 20ms 8 May 2025 276th albanian-laundromat 0 87 1,424ms 2 days ago 276th Yax42 🇫🇷 0 87 2,511ms 70 mins ago 281st GolfingSuccess 🇬🇷 0 88 6ms 12 Nov 2025 281st kg583 🇺🇸 0 88 23ms 12 Feb 2026 281st fuzzylojik-golf 🇺🇸 0 88 152ms 16 hours ago 284th Shanethegamer 🇺🇸 0 89 341ms 6 May 2025 284th Shanethegamer 🇺🇸 0 89 511ms 24 Sep 2025 284th DialFrost 🇸🇬 0 89 367ms 21 Nov 2025 284th CaedenHarper 🇨🇦 0 89 103ms 42 hours ago 288th Yax42 🇫🇷 0 90 13ms 68 mins ago 289th KasperKivimaeki 🇫🇮 0 91 13ms 8 May 2025 289th GolfingSuccess 🇬🇷 0 91 14ms 13 Dec 2025 291st namelessiw 0 92 504ms 10 Oct 2025 291st fuzzylojik-golf 🇺🇸 0 92 390ms 17 hours ago 293rd CaedenHarper 🇨🇦 0 93 13ms 2 days ago 294th DialFrost 🇸🇬 0 94 13ms 10 May 2025 294th edsrzf 🇳🇿 0 94 187ms 17 May 2025 296th Yax42 🇫🇷 0 95 389ms 51 mins ago 297th GolfingSuccess 🇬🇷 0 96 182ms 7 May 2025 298th Shanethegamer 🇺🇸 0 98 7ms 6 May 2025 299th snydej 0 99 43ms 22 Nov 2024 299th albanian-laundromat 0 99 343ms 2 days ago 301st dokutan 0 100 370ms 45 mins ago 302nd sean-niemann 🇺🇸 0 102 286ms 8 May 2025 302nd Shanethegamer 🇺🇸 0 102 307ms 8 May 2025 302nd edsrzf 🇳🇿 0 102 295ms 9 May 2025 302nd GolfingSuccess 🇬🇷 0 102 306ms 9 May 2025 302nd ovs-code 🇩🇪 0 102 311ms 13 Dec 2025 302nd CaedenHarper 🇨🇦 0 102 301ms 2 days ago 302nd fuzzylojik-golf 🇺🇸 0 102 292ms 17 hours ago 309th lukechampine 0 103 301ms 7 Jun 2025 309th chris124567 0 103 294ms 8 Jun 2025 309th albanian-laundromat 0 103 270ms 16 Dec 2025 309th GolfingSuccess 🇬🇷 0 103 336ms 14 Jan 2026 313th edsrzf 🇳🇿 0 104 17ms 39 mins ago 314th kg583 🇺🇸 0 110 14ms 12 Jan 2026 315th retrohun 0 112 16ms 5 hours ago 316th prestosilver 🇺🇸 0 115 418ms 3 hours ago 317th GolfingSuccess 🇬🇷 0 117 34ms 25 Dec 2025 318th saito-ta 🇯🇵 0 128 1,990ms 8 May 2025 319th CaedenHarper 🇨🇦 0 129 455ms 2 days ago 320th Natanaelel 🇸🇪 0 130 360ms 2 May 2025 First Prev 241–320 of 335 Next Last