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 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 159th error256 0 70 133ms 15 Jan 2026 159th error256 0 70 18ms 11 days ago 163rd GolfingSuccess 🇬🇷 0 71 4ms 12 Jan 2026 163rd GolfingSuccess 🇬🇷 0 71 24ms 12 Jan 2026 163rd GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 163rd ovs-code 🇩🇪 0 71 134ms 17 hours ago 163rd edsrzf 🇳🇿 0 71 18ms 10 hours ago 163rd kg583 🇺🇸 0 71 18ms 8 hours ago 163rd rhdqor213 0 71 4ms 4 hours ago 170th rucin93 🇵🇱 0 72 9ms 18 days ago 170th aksyristos 0 72 247ms 13 days ago 170th blaztoma 🇱🇹 0 72 123ms 21 hours ago 170th Emutis 🇱🇹 0 72 121ms 20 hours ago 170th KasperKivimaeki 🇫🇮 0 72 4ms 16 hours ago 170th edsrzf 🇳🇿 0 72 9ms 2 hours ago 176th IISResetMe 0 73 310ms 10 Jan 2026 177th saito-ta 🇯🇵 0 74 3ms 11 May 2025 177th error256 0 74 3ms 12 Jan 2026 177th dokutan 0 74 65ms 8 Feb 2026 177th lukegustafson 🇺🇸 0 74 189ms 16 days ago 177th albanian-laundromat 0 74 9ms 8 days ago 182nd Shanethegamer 🇺🇸 0 75 71ms 7 May 2025 182nd Natanaelel 🇸🇪 0 75 19ms 11 May 2025 182nd commandz0 🇺🇸 0 75 1,210ms 27 Aug 2025 182nd albanian-laundromat 0 75 108ms 5 Jan 2026 182nd albanian-laundromat 0 75 455ms 6 Jan 2026 182nd GolfingSuccess 🇬🇷 0 75 18ms 11 Jan 2026 182nd albanian-laundromat 0 75 238ms 22 days ago 182nd madex 🇩🇪 0 75 18ms 6 days ago 182nd CaedenHarper 🇨🇦 0 75 149ms 3 days ago 182nd Yax42 🇫🇷 0 75 4ms 17 hours ago 182nd edsrzf 🇳🇿 0 75 17ms 3 hours ago 193rd Shanethegamer 🇺🇸 0 76 129ms 13 Dec 2024 193rd ovs-code 🇩🇪 0 76 3ms 10 May 2025 193rd AlephSquirrel 0 76 43ms 3 Dec 2025 193rd AlephSquirrel 0 76 445ms 3 Dec 2025 193rd albanian-laundromat 0 76 18ms 22 days ago 193rd albanian-laundromat 0 76 188ms 16 days ago 193rd MeWhenI 🇻🇦 0 76 586ms 9 days ago 200th Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 200th DialFrost 🇸🇬 0 77 19ms 8 May 2025 200th Natanaelel 🇸🇪 0 77 3ms 11 May 2025 200th addmai 0 77 20ms 24 Jul 2025 200th hiichbindermax 0 77 19ms 17 Aug 2025 200th 5cw 🇺🇸 0 77 18ms 22 Aug 2025 200th davecame 0 77 150ms 25 Sep 2025 200th SirBogman 🇺🇸 0 77 240ms 13 Oct 2025 200th jtaxen 0 77 19ms 16 Oct 2025 200th albanian-laundromat 0 77 412ms 6 Dec 2025 200th Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 200th KasperKivimaeki 🇫🇮 0 77 564ms 9 days ago 200th StefanHabel 🇨🇦 0 77 1,207ms 30 hours ago 200th ahmetdemirag 🇨🇾 0 77 18ms 25 hours ago 200th tomh1012 0 77 17ms 23 hours ago 200th qpwoeirut 0 77 20ms 8 hours ago 200th btjones0 0 77 19ms 5 hours ago 200th ComradeSquirrel 0 77 18ms 4 hours ago 200th bzijlema 🇳🇱 0 77 18ms 2 hours ago 219th jameswmccarty 0 78 20ms 29 Mar 2025 219th DialFrost 🇸🇬 0 78 940ms 10 May 2025 219th DialFrost 🇸🇬 0 78 3ms 10 May 2025 219th solisolu 0 78 20ms 10 Nov 2025 223rd BREMAUCY 🇫🇷 0 79 18ms 26 hours ago 223rd Andrey2001 0 79 18ms 20 hours ago 223rd edsrzf 🇳🇿 0 79 30ms 2 hours ago 226th Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 226th error256 0 80 466ms 16 Jan 2026 226th madex 🇩🇪 0 80 378ms 29 hours ago 226th stefangimmillaro 0 80 19ms 7 hours ago 226th albanian-laundromat 0 80 28ms 6 hours ago 231st Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 232nd bricknellj 0 82 17ms 30 Jan 2025 232nd scpchicken 🇵🇼 0 82 402ms 36 hours ago 232nd KatieLG 🇬🇧 0 82 18ms 36 hours ago 232nd madex 🇩🇪 0 82 4ms 29 hours ago 236th GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 236th GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 236th error256 0 83 430ms 12 Jan 2026 236th albanian-laundromat 0 83 9ms 26 Jan 2026 236th edsrzf 🇳🇿 0 83 473ms 5 hours ago First Prev 161–240 of 323 Next Last