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 211th anter69 🇭🇺 0 62 15ms 45 hours ago 211th qpwoeirut 0 62 17ms 37 hours ago 211th stefangimmillaro 0 62 16ms 36 hours ago 211th btjones0 0 62 15ms 34 hours ago 211th bzijlema 🇳🇱 0 62 16ms 31 hours ago 211th ahmetdemirag 🇨🇾 0 62 15ms 28 hours ago 211th Pyroan 0 62 19ms 21 hours ago 211th edsrzf 🇳🇿 0 62 15ms 20 hours ago 211th zacjl 0 62 17ms 13 hours ago 211th MeWhenI 🇻🇦 0 62 86ms 11 hours ago 211th ComradeSquirrel 0 62 14ms 10 hours ago 211th duckyluuk 🇳🇱 0 62 15ms 4 hours ago 253rd sean-niemann 🇺🇸 0 63 43ms 8 May 2025 253rd albanian-laundromat 0 63 44ms 14 Jan 2026 253rd tomh1012 0 63 15ms 2 days ago 253rd MeWhenI 🇻🇦 0 63 204ms 21 hours ago 253rd mishak-sys 0 63 15ms 3 hours ago 258th jameswmccarty 0 64 15ms 29 Mar 2025 258th dokutan 0 64 63ms 8 Feb 2026 258th albanian-laundromat 0 64 188ms 4 days ago 258th zgialor-lab 0 64 16ms 23 hours ago 262nd JDiLenarda 🇫🇷 0 65 1,347ms 26 hours ago 263rd Shanethegamer 🇺🇸 0 66 1,317ms 26 Nov 2024 263rd rucin93 🇵🇱 0 66 6ms 8 May 2025 263rd sean-niemann 🇺🇸 0 66 7ms 8 May 2025 263rd AdrienHache 🇫🇷 0 66 421ms 2 Nov 2025 263rd namelessiw 0 66 474ms 2 Nov 2025 263rd GolfingSuccess 🇬🇷 0 66 430ms 4 Feb 2026 263rd albanian-laundromat 0 66 1,391ms 4 days ago 263rd Yax42 🇫🇷 0 66 484ms 3 days ago 263rd fuzzylojik-golf 🇺🇸 0 66 456ms 2 days ago 263rd edsrzf 🇳🇿 0 66 7ms 36 hours ago 263rd edsrzf 🇳🇿 0 66 1,345ms 19 hours ago 263rd edsrzf 🇳🇿 0 66 451ms 7 hours ago 263rd Steffan153 🇫🇮 0 66 480ms 73 mins ago 276th GolfingSuccess 🇬🇷 0 67 12ms 8 May 2025 276th tomh1012 0 67 429ms 2 days ago 278th Shanethegamer 🇺🇸 0 68 145ms 26 Nov 2024 278th sean-niemann 🇺🇸 0 68 131ms 8 May 2025 278th edsrzf 🇳🇿 0 68 113ms 25 May 2025 278th GolfingSuccess 🇬🇷 0 68 110ms 3 days ago 278th fuzzylojik-golf 🇺🇸 0 68 1,320ms 25 hours ago 278th Steffan153 🇫🇮 0 68 104ms 68 mins ago 284th GolfingSuccess 🇬🇷 0 69 10ms 8 May 2025 284th CaedenHarper 🇨🇦 0 69 486ms 3 days ago 286th JOrE20 0 70 41ms 13 Feb 2026 287th kg583 🇺🇸 0 71 27ms 1 Dec 2024 287th CLOStrophobic 🇮🇹 0 71 13ms 18 Jan 2025 287th GolfingSuccess 🇬🇷 0 71 14ms 7 May 2025 287th edsrzf 🇳🇿 0 71 14ms 8 May 2025 287th AlephSquirrel 0 71 13ms 9 May 2025 292nd Shanethegamer 🇺🇸 0 72 27ms 9 Dec 2024 293rd GolfingSuccess 🇬🇷 0 73 16ms 8 May 2025 293rd GolfingSuccess 🇬🇷 0 73 8ms 19 hours ago 295th not-a-pokemon 0 74 15ms 24 hours ago 296th Shanethegamer 🇺🇸 0 75 99ms 26 Nov 2024 296th sean-niemann 🇺🇸 0 75 103ms 8 May 2025 296th HumanoidCPU 0 75 112ms 29 hours ago 299th GolfingSuccess 🇬🇷 0 76 133ms 28 Nov 2025 299th fuzzylojik-golf 🇺🇸 0 76 99ms 2 days ago 299th edsrzf 🇳🇿 0 76 131ms 2 days ago 299th emgordon154 0 76 115ms 36 hours ago 299th MeWhenI 🇻🇦 0 76 98ms 21 hours ago 304th rucin93 🇵🇱 0 77 130ms 8 May 2025 304th Shanethegamer 🇺🇸 0 77 146ms 12 Nov 2025 304th edsrzf 🇳🇿 0 77 7ms 21 hours ago 304th GolfingSuccess 🇬🇷 0 77 8ms 19 hours ago 308th saito-ta 🇯🇵 0 78 4ms 10 May 2025 308th rhdqor213 0 78 4ms 10 May 2025 308th albanian-laundromat 0 78 93ms 4 days ago 308th fuzzylojik-golf 🇺🇸 0 78 8ms 26 hours ago 308th edsrzf 🇳🇿 0 78 425ms 19 hours ago 313th sean-niemann 🇺🇸 0 80 455ms 8 May 2025 314th kumavale 0 81 156ms 26 Nov 2025 314th Matter1024 🇮🇳 0 81 45ms 14 Feb 2026 314th albanian-laundromat 0 81 45ms 4 days ago 314th fuzzylojik-golf 🇺🇸 0 81 9ms 26 hours ago 314th stefangimmillaro 0 81 46ms 13 hours ago 319th GolfingSuccess 🇬🇷 0 82 502ms 8 May 2025 319th emgordon154 0 82 159ms 14 Feb 2026 First Prev 241–320 of 435 Next Last