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 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 224th ComradeSquirrel 0 77 18ms 37 hours ago 224th bzijlema 🇳🇱 0 77 18ms 35 hours ago 224th Lv0Sys 🇵🇱 0 77 18ms 10 hours ago 244th jameswmccarty 0 78 20ms 29 Mar 2025 244th DialFrost 🇸🇬 0 78 3ms 10 May 2025 244th solisolu 0 78 20ms 10 Nov 2025 247th BREMAUCY 🇫🇷 0 79 18ms 2 days ago 247th Andrey2001 0 79 18ms 2 days ago 247th edsrzf 🇳🇿 0 79 30ms 35 hours ago 247th madex 🇩🇪 0 79 416ms 23 hours ago 247th mishak-sys 0 79 411ms 7 hours ago 252nd Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 252nd error256 0 80 466ms 16 Jan 2026 252nd stefangimmillaro 0 80 19ms 40 hours ago 252nd albanian-laundromat 0 80 29ms 40 hours ago 256th Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 256th Lv0Sys 🇵🇱 0 81 437ms 7 hours ago 258th bricknellj 0 82 17ms 30 Jan 2025 258th scpchicken 🇵🇼 0 82 402ms 2 days ago 258th KatieLG 🇬🇧 0 82 18ms 2 days ago 258th madex 🇩🇪 0 82 4ms 2 days ago 258th MeWhenI 🇻🇦 0 82 114ms 22 hours ago 258th solisolu 0 82 4ms 8 hours ago 264th GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 264th GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 264th error256 0 83 430ms 12 Jan 2026 264th albanian-laundromat 0 83 9ms 26 Jan 2026 264th edsrzf 🇳🇿 0 83 473ms 39 hours ago 264th edsrzf 🇳🇿 0 83 1,251ms 37 hours ago 264th edsrzf 🇳🇿 0 83 106ms 11 hours ago 264th Steffan153 🇫🇮 0 83 416ms 5 hours ago 272nd Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 272nd edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 272nd albanian-laundromat 0 85 92ms 6 Dec 2025 272nd GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 272nd edsrzf 🇳🇿 0 85 28ms 36 hours ago 277th kg583 🇺🇸 0 86 23ms 2 Oct 2025 277th GolfingSuccess 🇬🇷 0 86 2,109ms 17 days ago 279th sean-niemann 🇺🇸 0 87 42ms 9 May 2025 279th error256 0 87 2,931ms 14 Jan 2026 279th IanUtley 0 87 2,957ms 16 Jan 2026 279th CaedenHarper 🇨🇦 0 87 439ms 45 hours ago 283rd muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 283rd albanian-laundromat 0 88 1,372ms 5 Jan 2026 285th Shanethegamer 🇺🇸 0 89 99ms 13 Dec 2024 285th GolfingSuccess 🇬🇷 0 89 64ms 12 Jan 2026 287th sean-niemann 🇺🇸 0 90 7ms 10 May 2025 288th ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 288th error256 0 91 62ms 12 Jan 2026 288th error256 0 91 293ms 14 Jan 2026 288th GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 288th Natanaelel 🇸🇪 0 91 333ms 2 days ago 288th Steffan153 🇫🇮 0 91 59ms 5 hours ago 294th Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 294th Yax42 🇫🇷 0 92 68ms 2 days ago 294th edsrzf 🇳🇿 0 92 18ms 13 hours ago 297th Yax42 🇫🇷 0 93 392ms 2 days ago 298th Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 298th edsrzf 🇳🇿 0 94 459ms 20 May 2025 298th MeWhenI 🇻🇦 0 94 396ms 25 hours ago 298th edsrzf 🇳🇿 0 94 6ms 19 hours ago 298th albanian-laundromat 0 94 6ms 19 hours ago 303rd albanian-laundromat 0 95 114ms 6 Jan 2026 304th Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 304th CaedenHarper 🇨🇦 0 96 416ms 47 hours ago 304th edsrzf 🇳🇿 0 96 32ms 47 hours ago 304th kumavale 0 96 155ms 17 hours ago 308th albanian-laundromat 0 97 44ms 6 Dec 2025 308th tomh1012 0 97 396ms 2 days ago 310th error256 0 98 156ms 16 Jan 2026 310th albanian-laundromat 0 98 135ms 23 Feb 2026 310th edsrzf 🇳🇿 0 98 163ms 19 hours ago 313th Shanethegamer 🇺🇸 0 99 352ms 24 Sep 2025 314th edsrzf 🇳🇿 0 100 145ms 9 May 2025 314th emgordon154 0 100 7ms 9 May 2025 314th JOrE20 0 100 42ms 15 Dec 2025 317th rucin93 🇵🇱 0 101 373ms 21 days ago 318th fantaize 0 102 148ms 16 days ago 318th emgordon154 0 102 4ms 41 hours ago 320th CLOStrophobic 🇮🇹 0 104 21ms 18 Jan 2025 First Prev 241–320 of 361 Next Last