The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 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 78th error256 0 44 11ms 12 Apr 2025 78th GolfingSuccess 🇬🇷 0 44 9ms 8 May 2025 78th GolfingSuccess 🇬🇷 0 44 12ms 8 May 2025 78th Natanaelel 🇸🇪 0 44 10ms 8 May 2025 78th sean-niemann 🇺🇸 0 44 11ms 8 May 2025 78th edsrzf 🇳🇿 0 44 9ms 10 May 2025 78th 4atj 0 44 11ms 8 Jun 2025 78th lukegustafson 🇺🇸 0 44 12ms 16 Jun 2025 78th JOrE20 0 44 12ms 6 Dec 2025 78th voytxt 🇨🇿 0 44 41ms 6 Feb 2026 78th Steffan153 🇫🇮 0 44 28ms 19 Feb 2026 78th CaedenHarper 🇨🇦 0 44 12ms 2 days ago 78th fuzzylojik-golf 🇺🇸 0 44 12ms 31 hours ago 78th fuzzylojik-golf 🇺🇸 0 44 9ms 31 hours ago 78th Yax42 🇫🇷 0 44 12ms 15 hours ago 78th helbling 🇨🇭 0 44 12ms 14 hours ago 78th HumanoidCPU 0 44 12ms 28 mins ago 98th Andrey-Plotnikov 0 45 12ms 10 Jan 2025 98th saito-ta 🇯🇵 0 45 555ms 10 May 2025 98th GolfingSuccess 🇬🇷 0 45 79ms 14 May 2025 98th XenThe 🇬🇧 0 45 12ms 15 Jul 2025 98th smclaughlin-cf 0 45 12ms 14 Oct 2025 98th albanian-laundromat 0 45 13ms 3 days ago 104th Shanethegamer 🇺🇸 0 46 377ms 26 Nov 2024 104th kg583 🇺🇸 0 46 458ms 1 Dec 2024 104th Shanethegamer 🇺🇸 0 46 527ms 10 Dec 2024 104th GolfingSuccess 🇬🇷 0 46 458ms 30 Dec 2024 104th pardouin 🇫🇷 0 46 416ms 24 Feb 2025 104th Shanethegamer 🇺🇸 0 46 8ms 30 Apr 2025 104th GolfingSuccess 🇬🇷 0 46 7ms 8 May 2025 104th rucin93 🇵🇱 0 46 8ms 11 May 2025 104th Steffan153 🇫🇮 0 46 376ms 26 days ago 104th fuzzylojik-golf 🇺🇸 0 46 409ms 34 hours ago 104th edsrzf 🇳🇿 0 46 7ms 34 hours ago 115th lifthrasiir 🇰🇷 0 47 416ms 11 Dec 2024 115th emgordon154 0 47 404ms 9 May 2025 115th LukeBridges 🇬🇧 0 47 12ms 20 hours ago 118th antimon2 🇯🇵 0 50 288ms 16 Dec 2024 118th Shanethegamer 🇺🇸 0 50 315ms 1 Feb 2025 118th ovs-code 🇩🇪 0 50 448ms 23 Feb 2025 118th CaedenHarper 🇨🇦 0 50 733ms 3 days ago 118th Steffan153 🇫🇮 0 50 776ms 3 days ago 118th edsrzf 🇳🇿 0 50 872ms 3 days ago 118th GolfingSuccess 🇬🇷 0 50 765ms 2 days ago 125th DialFrost 🇸🇬 0 51 269ms 24 Feb 2025 125th Shanethegamer 🇺🇸 0 51 5ms 30 Apr 2025 125th GolfingSuccess 🇬🇷 0 51 157ms 8 May 2025 125th rucin93 🇵🇱 0 51 159ms 8 May 2025 125th Shanethegamer 🇺🇸 0 51 150ms 8 May 2025 125th sean-niemann 🇺🇸 0 51 150ms 9 May 2025 125th DialFrost 🇸🇬 0 51 302ms 8 Sep 2025 125th HumanoidCPU 0 51 394ms 11 hours ago 125th albanian-laundromat 0 51 5ms 5 hours ago 134th DialFrost 🇸🇬 0 52 474ms 17 Feb 2025 134th CaedenHarper 🇨🇦 0 52 530ms 3 days ago 136th dokutan 0 53 426ms 15 Aug 2025 136th MeWhenI 🇻🇦 0 53 393ms 21 Nov 2025 136th albanian-laundromat 0 53 467ms 15 Jan 2026 136th AlephSquirrel 0 53 383ms 2 days ago 140th Shanethegamer 🇺🇸 0 54 69ms 12 Dec 2024 140th error256 0 54 66ms 12 Apr 2025 140th albanian-laundromat 0 54 779ms 15 Jan 2026 140th GolfingSuccess 🇬🇷 0 54 71ms 2 days ago 140th dokutan 0 54 800ms 15 hours ago 140th HumanoidCPU 0 54 36ms a min ago 146th albanian-laundromat 0 55 39ms 3 days ago 147th hallvabo 🇳🇴 0 56 15ms 29 Nov 2024 147th kg583 🇺🇸 0 56 16ms 1 Dec 2024 147th CornerMercury 🇬🇧 0 56 15ms 3 Dec 2024 147th ndren 0 56 16ms 3 Dec 2024 147th lifthrasiir 🇰🇷 0 56 37ms 11 Dec 2024 147th GolfingSuccess 🇬🇷 0 56 16ms 30 Dec 2024 147th khvdm 0 56 16ms 12 Jan 2025 147th pardouin 🇫🇷 0 56 16ms 24 Feb 2025 147th Shanethegamer 🇺🇸 0 56 66ms 30 Apr 2025 147th GolfingSuccess 🇬🇷 0 56 70ms 8 May 2025 147th sean-niemann 🇺🇸 0 56 67ms 8 May 2025 147th sean-niemann 🇺🇸 0 56 16ms 8 May 2025 147th emgordon154 0 56 16ms 9 May 2025 147th dokutan 0 56 16ms 18 Aug 2025 First Prev 81–160 of 363 Next Last