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 76th GolfingSuccess 🇬🇷 0 44 12ms 8 May 2025 76th Natanaelel 🇸🇪 0 44 10ms 8 May 2025 76th sean-niemann 🇺🇸 0 44 11ms 8 May 2025 76th edsrzf 🇳🇿 0 44 9ms 10 May 2025 76th 4atj 0 44 11ms 8 Jun 2025 76th lukegustafson 🇺🇸 0 44 12ms 16 Jun 2025 76th JOrE20 0 44 12ms 6 Dec 2025 76th voytxt 🇨🇿 0 44 41ms 6 Feb 2026 76th Steffan153 🇫🇮 0 44 28ms 19 Feb 2026 76th CaedenHarper 🇨🇦 0 44 12ms 2 days ago 76th fuzzylojik-golf 🇺🇸 0 44 13ms 24 hours ago 76th fuzzylojik-golf 🇺🇸 0 44 9ms 23 hours ago 76th Yax42 🇫🇷 0 44 12ms 8 hours ago 76th helbling 🇨🇭 0 44 12ms 6 hours ago 95th Andrey-Plotnikov 0 45 12ms 10 Jan 2025 95th saito-ta 🇯🇵 0 45 555ms 10 May 2025 95th GolfingSuccess 🇬🇷 0 45 79ms 14 May 2025 95th XenThe 🇬🇧 0 45 12ms 15 Jul 2025 95th smclaughlin-cf 0 45 12ms 14 Oct 2025 95th albanian-laundromat 0 45 13ms 3 days ago 101st Shanethegamer 🇺🇸 0 46 377ms 26 Nov 2024 101st kg583 🇺🇸 0 46 458ms 1 Dec 2024 101st Shanethegamer 🇺🇸 0 46 527ms 10 Dec 2024 101st GolfingSuccess 🇬🇷 0 46 458ms 30 Dec 2024 101st pardouin 🇫🇷 0 46 416ms 24 Feb 2025 101st Shanethegamer 🇺🇸 0 46 8ms 30 Apr 2025 101st GolfingSuccess 🇬🇷 0 46 7ms 8 May 2025 101st rucin93 🇵🇱 0 46 8ms 11 May 2025 101st Steffan153 🇫🇮 0 46 376ms 26 days ago 101st fuzzylojik-golf 🇺🇸 0 46 409ms 27 hours ago 101st edsrzf 🇳🇿 0 46 7ms 26 hours ago 112th lifthrasiir 🇰🇷 0 47 416ms 11 Dec 2024 112th emgordon154 0 47 404ms 9 May 2025 112th LukeBridges 🇬🇧 0 47 12ms 12 hours ago 115th antimon2 🇯🇵 0 50 288ms 16 Dec 2024 115th Shanethegamer 🇺🇸 0 50 315ms 1 Feb 2025 115th ovs-code 🇩🇪 0 50 448ms 23 Feb 2025 115th CaedenHarper 🇨🇦 0 50 733ms 3 days ago 115th Steffan153 🇫🇮 0 50 776ms 3 days ago 115th edsrzf 🇳🇿 0 50 872ms 3 days ago 115th GolfingSuccess 🇬🇷 0 50 765ms 2 days ago 122nd DialFrost 🇸🇬 0 51 269ms 24 Feb 2025 122nd Shanethegamer 🇺🇸 0 51 5ms 30 Apr 2025 122nd GolfingSuccess 🇬🇷 0 51 157ms 8 May 2025 122nd rucin93 🇵🇱 0 51 159ms 8 May 2025 122nd Shanethegamer 🇺🇸 0 51 150ms 8 May 2025 122nd sean-niemann 🇺🇸 0 51 150ms 9 May 2025 122nd DialFrost 🇸🇬 0 51 302ms 8 Sep 2025 122nd HumanoidCPU 0 51 394ms 4 hours ago 130th DialFrost 🇸🇬 0 52 474ms 17 Feb 2025 130th CaedenHarper 🇨🇦 0 52 530ms 3 days ago 130th albanian-laundromat 0 52 5ms 3 days ago 133rd dokutan 0 53 426ms 15 Aug 2025 133rd MeWhenI 🇻🇦 0 53 393ms 21 Nov 2025 133rd albanian-laundromat 0 53 467ms 15 Jan 2026 133rd AlephSquirrel 0 53 383ms 2 days ago 137th Shanethegamer 🇺🇸 0 54 69ms 12 Dec 2024 137th error256 0 54 66ms 12 Apr 2025 137th albanian-laundromat 0 54 779ms 15 Jan 2026 137th GolfingSuccess 🇬🇷 0 54 71ms 2 days ago 137th dokutan 0 54 800ms 7 hours ago 142nd albanian-laundromat 0 55 39ms 2 days ago 143rd hallvabo 🇳🇴 0 56 15ms 29 Nov 2024 143rd kg583 🇺🇸 0 56 16ms 1 Dec 2024 143rd CornerMercury 🇬🇧 0 56 15ms 3 Dec 2024 143rd ndren 0 56 16ms 3 Dec 2024 143rd lifthrasiir 🇰🇷 0 56 37ms 11 Dec 2024 143rd GolfingSuccess 🇬🇷 0 56 16ms 30 Dec 2024 143rd khvdm 0 56 16ms 12 Jan 2025 143rd pardouin 🇫🇷 0 56 16ms 24 Feb 2025 143rd Shanethegamer 🇺🇸 0 56 66ms 30 Apr 2025 143rd GolfingSuccess 🇬🇷 0 56 70ms 8 May 2025 143rd sean-niemann 🇺🇸 0 56 67ms 8 May 2025 143rd sean-niemann 🇺🇸 0 56 16ms 8 May 2025 143rd emgordon154 0 56 16ms 9 May 2025 143rd dokutan 0 56 16ms 18 Aug 2025 143rd albanian-laundromat 0 56 16ms 2 Dec 2025 143rd DialFrost 🇸🇬 0 56 2,628ms 16 Dec 2025 143rd Steffan153 🇫🇮 0 56 16ms 21 Feb 2026 143rd fuzzylojik-golf 🇺🇸 0 56 17ms 27 hours ago First Prev 81–160 of 345 Next Last