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 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 81st ovs-code 🇩🇪 0 42 81ms 30 May 2025 81st anter69 🇭🇺 0 42 1,272ms 32 hours ago 83rd sean-niemann 🇺🇸 0 43 8ms 8 May 2025 83rd targrik 0 43 9ms 3 Sep 2025 85th Shanethegamer 🇺🇸 0 44 12ms 10 Dec 2024 85th DialFrost 🇸🇬 0 44 11ms 24 Feb 2025 85th rucin93 🇵🇱 0 44 12ms 24 Feb 2025 85th error256 0 44 14ms 12 Apr 2025 85th GolfingSuccess 🇬🇷 0 44 9ms 8 May 2025 85th GolfingSuccess 🇬🇷 0 44 13ms 8 May 2025 85th Natanaelel 🇸🇪 0 44 12ms 8 May 2025 85th sean-niemann 🇺🇸 0 44 12ms 8 May 2025 85th edsrzf 🇳🇿 0 44 9ms 10 May 2025 85th 4atj 0 44 15ms 8 Jun 2025 85th lukegustafson 🇺🇸 0 44 14ms 16 Jun 2025 85th JOrE20 0 44 12ms 6 Dec 2025 85th voytxt 🇨🇿 0 44 12ms 6 Feb 2026 85th Steffan153 🇫🇮 0 44 16ms 19 Feb 2026 85th CaedenHarper 🇨🇦 0 44 14ms 3 days ago 85th fuzzylojik-golf 🇺🇸 0 44 11ms 2 days ago 85th fuzzylojik-golf 🇺🇸 0 44 9ms 2 days ago 85th Yax42 🇫🇷 0 44 12ms 33 hours ago 85th helbling 🇨🇭 0 44 12ms 32 hours ago 85th HumanoidCPU 0 44 15ms 18 hours ago 85th emgordon154 0 44 12ms 13 hours ago 85th MeWhenI 🇻🇦 0 44 14ms 8 hours ago 85th edsrzf 🇳🇿 0 44 13ms 7 hours ago 108th Andrey-Plotnikov 0 45 12ms 10 Jan 2025 108th saito-ta 🇯🇵 0 45 555ms 10 May 2025 108th GolfingSuccess 🇬🇷 0 45 79ms 14 May 2025 108th XenThe 🇬🇧 0 45 14ms 15 Jul 2025 108th smclaughlin-cf 0 45 13ms 14 Oct 2025 108th albanian-laundromat 0 45 12ms 4 days ago 114th Shanethegamer 🇺🇸 0 46 377ms 26 Nov 2024 114th kg583 🇺🇸 0 46 458ms 1 Dec 2024 114th Shanethegamer 🇺🇸 0 46 527ms 10 Dec 2024 114th GolfingSuccess 🇬🇷 0 46 458ms 30 Dec 2024 114th pardouin 🇫🇷 0 46 416ms 24 Feb 2025 114th Shanethegamer 🇺🇸 0 46 8ms 30 Apr 2025 114th GolfingSuccess 🇬🇷 0 46 7ms 8 May 2025 114th rucin93 🇵🇱 0 46 8ms 11 May 2025 114th Steffan153 🇫🇮 0 46 376ms 27 days ago 114th fuzzylojik-golf 🇺🇸 0 46 409ms 2 days ago 114th edsrzf 🇳🇿 0 46 7ms 2 days ago 125th lifthrasiir 🇰🇷 0 47 416ms 11 Dec 2024 125th emgordon154 0 47 404ms 9 May 2025 125th LukeBridges 🇬🇧 0 47 11ms 37 hours ago 128th HumanoidCPU 0 48 1,424ms 16 hours ago 129th antimon2 🇯🇵 0 50 288ms 16 Dec 2024 129th Shanethegamer 🇺🇸 0 50 315ms 1 Feb 2025 129th ovs-code 🇩🇪 0 50 448ms 23 Feb 2025 129th CaedenHarper 🇨🇦 0 50 733ms 4 days ago 129th Steffan153 🇫🇮 0 50 776ms 4 days ago 129th edsrzf 🇳🇿 0 50 872ms 4 days ago 129th GolfingSuccess 🇬🇷 0 50 765ms 3 days ago 129th DialFrost 🇸🇬 0 50 330ms 6 hours ago 137th Shanethegamer 🇺🇸 0 51 5ms 30 Apr 2025 137th GolfingSuccess 🇬🇷 0 51 157ms 8 May 2025 137th rucin93 🇵🇱 0 51 159ms 8 May 2025 137th Shanethegamer 🇺🇸 0 51 150ms 8 May 2025 137th sean-niemann 🇺🇸 0 51 150ms 9 May 2025 137th DialFrost 🇸🇬 0 51 302ms 8 Sep 2025 137th HumanoidCPU 0 51 394ms 29 hours ago 137th albanian-laundromat 0 51 5ms 23 hours ago 145th DialFrost 🇸🇬 0 52 461ms 17 Feb 2025 145th CaedenHarper 🇨🇦 0 52 530ms 4 days ago 147th dokutan 0 53 426ms 15 Aug 2025 147th MeWhenI 🇻🇦 0 53 393ms 21 Nov 2025 147th albanian-laundromat 0 53 467ms 15 Jan 2026 147th AlephSquirrel 0 53 383ms 3 days ago 151st Shanethegamer 🇺🇸 0 54 69ms 12 Dec 2024 151st error256 0 54 66ms 12 Apr 2025 151st albanian-laundromat 0 54 779ms 15 Jan 2026 151st GolfingSuccess 🇬🇷 0 54 71ms 3 days ago 151st dokutan 0 54 778ms 33 hours ago 151st fuzzylojik-golf 🇺🇸 0 54 81ms 14 hours ago 157th albanian-laundromat 0 55 39ms 3 days ago 158th hallvabo 🇳🇴 0 56 15ms 29 Nov 2024 158th kg583 🇺🇸 0 56 16ms 1 Dec 2024 158th CornerMercury 🇬🇧 0 56 15ms 3 Dec 2024 First Prev 81–160 of 409 Next Last