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 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 80th targrik 0 43 9ms 3 Sep 2025 80th lyphyser 0 43 53ms 2 hours ago 83rd Shanethegamer 🇺🇸 0 44 12ms 10 Dec 2024 83rd DialFrost 🇸🇬 0 44 11ms 24 Feb 2025 83rd rucin93 🇵🇱 0 44 12ms 24 Feb 2025 83rd error256 0 44 14ms 12 Apr 2025 83rd GolfingSuccess 🇬🇷 0 44 9ms 8 May 2025 83rd GolfingSuccess 🇬🇷 0 44 13ms 8 May 2025 83rd Natanaelel 🇸🇪 0 44 12ms 8 May 2025 83rd sean-niemann 🇺🇸 0 44 12ms 8 May 2025 83rd edsrzf 🇳🇿 0 44 9ms 10 May 2025 83rd 4atj 0 44 15ms 8 Jun 2025 83rd lukegustafson 🇺🇸 0 44 14ms 16 Jun 2025 83rd JOrE20 0 44 12ms 6 Dec 2025 83rd AdrienHache 🇫🇷 0 44 60ms 5 Feb 2026 83rd voytxt 🇨🇿 0 44 12ms 6 Feb 2026 83rd Steffan153 🇫🇮 0 44 16ms 19 Feb 2026 83rd CaedenHarper 🇨🇦 0 44 14ms 3 days ago 83rd fuzzylojik-golf 🇺🇸 0 44 11ms 2 days ago 83rd fuzzylojik-golf 🇺🇸 0 44 9ms 2 days ago 83rd Yax42 🇫🇷 0 44 12ms 32 hours ago 83rd helbling 🇨🇭 0 44 12ms 31 hours ago 83rd HumanoidCPU 0 44 15ms 17 hours ago 83rd emgordon154 0 44 12ms 12 hours ago 83rd MeWhenI 🇻🇦 0 44 14ms 7 hours ago 83rd edsrzf 🇳🇿 0 44 13ms 6 hours ago 107th Andrey-Plotnikov 0 45 12ms 10 Jan 2025 107th saito-ta 🇯🇵 0 45 555ms 10 May 2025 107th XenThe 🇬🇧 0 45 14ms 15 Jul 2025 107th smclaughlin-cf 0 45 13ms 14 Oct 2025 107th albanian-laundromat 0 45 12ms 4 days ago 112th Shanethegamer 🇺🇸 0 46 377ms 26 Nov 2024 112th Shanethegamer 🇺🇸 0 46 8ms 30 Apr 2025 112th GolfingSuccess 🇬🇷 0 46 7ms 8 May 2025 112th rucin93 🇵🇱 0 46 8ms 11 May 2025 112th edsrzf 🇳🇿 0 46 7ms 2 days ago 117th LukeBridges 🇬🇧 0 47 11ms 37 hours ago 118th HumanoidCPU 0 48 1,424ms 16 hours ago 119th kg583 🇺🇸 0 50 470ms 1 Dec 2024 119th Shanethegamer 🇺🇸 0 50 471ms 10 Dec 2024 119th GolfingSuccess 🇬🇷 0 50 460ms 30 Dec 2024 119th ovs-code 🇩🇪 0 50 448ms 23 Feb 2025 119th pardouin 🇫🇷 0 50 433ms 24 Feb 2025 119th emgordon154 0 50 424ms 9 May 2025 119th Steffan153 🇫🇮 0 50 378ms 27 days ago 119th CaedenHarper 🇨🇦 0 50 733ms 4 days ago 119th Steffan153 🇫🇮 0 50 776ms 4 days ago 119th edsrzf 🇳🇿 0 50 872ms 4 days ago 119th GolfingSuccess 🇬🇷 0 50 765ms 3 days ago 119th fuzzylojik-golf 🇺🇸 0 50 420ms 2 days ago 131st lifthrasiir 🇰🇷 0 51 433ms 11 Dec 2024 131st Shanethegamer 🇺🇸 0 51 5ms 30 Apr 2025 131st GolfingSuccess 🇬🇷 0 51 157ms 8 May 2025 131st rucin93 🇵🇱 0 51 159ms 8 May 2025 131st Shanethegamer 🇺🇸 0 51 150ms 8 May 2025 131st sean-niemann 🇺🇸 0 51 150ms 9 May 2025 131st DialFrost 🇸🇬 0 51 302ms 8 Sep 2025 131st albanian-laundromat 0 51 5ms 22 hours ago 139th DialFrost 🇸🇬 0 52 461ms 17 Feb 2025 139th CaedenHarper 🇨🇦 0 52 530ms 4 days ago 139th HumanoidCPU 0 52 394ms 28 hours ago 142nd antimon2 🇯🇵 0 53 288ms 16 Dec 2024 142nd Shanethegamer 🇺🇸 0 53 315ms 1 Feb 2025 142nd dokutan 0 53 426ms 15 Aug 2025 142nd MeWhenI 🇻🇦 0 53 393ms 21 Nov 2025 142nd albanian-laundromat 0 53 467ms 15 Jan 2026 142nd AlephSquirrel 0 53 383ms 3 days ago 142nd DialFrost 🇸🇬 0 53 330ms 5 hours ago 149th Shanethegamer 🇺🇸 0 54 69ms 12 Dec 2024 149th error256 0 54 66ms 12 Apr 2025 149th albanian-laundromat 0 54 779ms 15 Jan 2026 149th GolfingSuccess 🇬🇷 0 54 71ms 3 days ago 149th dokutan 0 54 778ms 32 hours ago 149th fuzzylojik-golf 🇺🇸 0 54 81ms 13 hours ago 155th albanian-laundromat 0 55 39ms 3 days ago 156th Shanethegamer 🇺🇸 0 56 66ms 30 Apr 2025 156th GolfingSuccess 🇬🇷 0 56 70ms 8 May 2025 156th sean-niemann 🇺🇸 0 56 67ms 8 May 2025 156th DialFrost 🇸🇬 0 56 2,628ms 16 Dec 2025 160th Shanethegamer 🇺🇸 0 57 326ms 25 May 2025 First Prev 81–160 of 408 Next Last