The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Gray Code Decoder 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 235th davecame 0 77 135ms 25 Sep 2025 235th SirBogman 🇺🇸 0 77 232ms 13 Oct 2025 235th jtaxen 0 77 19ms 16 Oct 2025 235th albanian-laundromat 0 77 412ms 6 Dec 2025 235th Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 235th KasperKivimaeki 🇫🇮 0 77 564ms 11 days ago 235th StefanHabel 🇨🇦 0 77 1,217ms 3 days ago 235th ahmetdemirag 🇨🇾 0 77 18ms 3 days ago 235th tomh1012 0 77 17ms 3 days ago 235th qpwoeirut 0 77 20ms 2 days ago 235th btjones0 0 77 19ms 2 days ago 235th ComradeSquirrel 0 77 18ms 2 days ago 235th bzijlema 🇳🇱 0 77 18ms 2 days ago 235th Lv0Sys 🇵🇱 0 77 18ms 29 hours ago 255th jameswmccarty 0 78 20ms 29 Mar 2025 255th DialFrost 🇸🇬 0 78 3ms 10 May 2025 255th solisolu 0 78 20ms 10 Nov 2025 255th madex 🇩🇪 0 78 3ms 9 hours ago 259th BREMAUCY 🇫🇷 0 79 18ms 3 days ago 259th Andrey2001 0 79 18ms 3 days ago 259th edsrzf 🇳🇿 0 79 30ms 2 days ago 259th mishak-sys 0 79 411ms 26 hours ago 263rd Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 263rd error256 0 80 466ms 16 Jan 2026 263rd stefangimmillaro 0 80 19ms 2 days ago 263rd albanian-laundromat 0 80 29ms 2 days ago 267th Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 267th Lv0Sys 🇵🇱 0 81 437ms 26 hours ago 267th Aquateraneal 🇺🇸 0 81 19ms 17 hours ago 267th luuumine 🇫🇷 0 81 16ms 2 hours ago 267th acollett89 0 81 14ms 8 mins ago 272nd bricknellj 0 82 17ms 30 Jan 2025 272nd scpchicken 🇵🇼 0 82 402ms 3 days ago 272nd KatieLG 🇬🇧 0 82 18ms 3 days ago 272nd MeWhenI 🇻🇦 0 82 105ms 41 hours ago 272nd solisolu 0 82 4ms 28 hours ago 277th GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 277th GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 277th error256 0 83 430ms 12 Jan 2026 277th albanian-laundromat 0 83 9ms 26 Jan 2026 277th edsrzf 🇳🇿 0 83 473ms 2 days ago 277th edsrzf 🇳🇿 0 83 1,251ms 2 days ago 277th edsrzf 🇳🇿 0 83 106ms 30 hours ago 277th Steffan153 🇫🇮 0 83 416ms 25 hours ago 285th Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 285th edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 285th albanian-laundromat 0 85 98ms 6 Dec 2025 285th GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 285th edsrzf 🇳🇿 0 85 28ms 2 days ago 290th kg583 🇺🇸 0 86 23ms 2 Oct 2025 290th GolfingSuccess 🇬🇷 0 86 2,109ms 18 days ago 292nd sean-niemann 🇺🇸 0 87 42ms 9 May 2025 292nd error256 0 87 2,931ms 14 Jan 2026 292nd IanUtley 0 87 2,957ms 16 Jan 2026 292nd CaedenHarper 🇨🇦 0 87 439ms 2 days ago 292nd madex 🇩🇪 0 87 13ms 8 hours ago 297th muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 297th albanian-laundromat 0 88 1,372ms 5 Jan 2026 299th Shanethegamer 🇺🇸 0 89 107ms 13 Dec 2024 299th GolfingSuccess 🇬🇷 0 89 64ms 12 Jan 2026 301st sean-niemann 🇺🇸 0 90 7ms 10 May 2025 302nd ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 302nd error256 0 91 62ms 12 Jan 2026 302nd error256 0 91 293ms 14 Jan 2026 302nd GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 302nd Natanaelel 🇸🇪 0 91 333ms 3 days ago 302nd Steffan153 🇫🇮 0 91 59ms 25 hours ago 308th Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 308th Yax42 🇫🇷 0 92 68ms 2 days ago 308th edsrzf 🇳🇿 0 92 18ms 33 hours ago 311th Yax42 🇫🇷 0 93 392ms 2 days ago 312th Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 312th edsrzf 🇳🇿 0 94 459ms 20 May 2025 312th MeWhenI 🇻🇦 0 94 396ms 44 hours ago 312th edsrzf 🇳🇿 0 94 6ms 38 hours ago 312th albanian-laundromat 0 94 6ms 38 hours ago 317th albanian-laundromat 0 95 114ms 6 Jan 2026 318th Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 318th CaedenHarper 🇨🇦 0 96 416ms 2 days ago 318th edsrzf 🇳🇿 0 96 32ms 2 days ago First Prev 241–320 of 379 Next Last