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 157th edsrzf 🇳🇿 0 66 11ms 32 hours ago 157th Steffan153 🇫🇮 0 66 10ms 8 hours ago 163rd Shanethegamer 🇺🇸 0 67 92ms 7 May 2025 163rd Shanethegamer 🇺🇸 0 67 436ms 7 May 2025 163rd namelessiw 0 67 407ms 2 Nov 2025 163rd error256 0 67 111ms 30 Jan 2026 163rd CaedenHarper 🇨🇦 0 67 553ms 4 days ago 163rd fuzzylojik-golf 🇺🇸 0 67 490ms 2 days ago 169th Yax42 🇫🇷 0 68 16ms 45 hours ago 170th 4atj 0 69 1,159ms 21 May 2025 170th GolfingSuccess 🇬🇷 0 69 447ms 14 Jan 2026 170th error256 0 69 410ms 3 days ago 170th edsrzf 🇳🇿 0 69 394ms 31 hours ago 174th btnlq 0 70 193ms 4 Dec 2024 174th kg583 🇺🇸 0 70 128ms 3 Oct 2025 174th error256 0 70 133ms 15 Jan 2026 174th error256 0 70 18ms 12 days ago 178th GolfingSuccess 🇬🇷 0 71 4ms 12 Jan 2026 178th GolfingSuccess 🇬🇷 0 71 24ms 12 Jan 2026 178th GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 178th ovs-code 🇩🇪 0 71 134ms 44 hours ago 178th edsrzf 🇳🇿 0 71 18ms 36 hours ago 178th kg583 🇺🇸 0 71 18ms 35 hours ago 178th rhdqor213 0 71 4ms 30 hours ago 185th rucin93 🇵🇱 0 72 9ms 19 days ago 185th aksyristos 0 72 247ms 14 days ago 185th blaztoma 🇱🇹 0 72 123ms 2 days ago 185th Emutis 🇱🇹 0 72 121ms 47 hours ago 185th KasperKivimaeki 🇫🇮 0 72 4ms 42 hours ago 185th edsrzf 🇳🇿 0 72 9ms 29 hours ago 185th zacjl 0 72 131ms 10 hours ago 192nd IISResetMe 0 73 310ms 10 Jan 2026 193rd saito-ta 🇯🇵 0 74 3ms 11 May 2025 193rd error256 0 74 3ms 12 Jan 2026 193rd dokutan 0 74 65ms 8 Feb 2026 193rd lukegustafson 🇺🇸 0 74 189ms 17 days ago 193rd albanian-laundromat 0 74 9ms 9 days ago 198th Shanethegamer 🇺🇸 0 75 71ms 7 May 2025 198th Natanaelel 🇸🇪 0 75 19ms 11 May 2025 198th commandz0 🇺🇸 0 75 1,210ms 27 Aug 2025 198th albanian-laundromat 0 75 108ms 5 Jan 2026 198th albanian-laundromat 0 75 455ms 6 Jan 2026 198th GolfingSuccess 🇬🇷 0 75 18ms 11 Jan 2026 198th albanian-laundromat 0 75 238ms 23 days ago 198th madex 🇩🇪 0 75 18ms 7 days ago 198th CaedenHarper 🇨🇦 0 75 149ms 4 days ago 198th Yax42 🇫🇷 0 75 4ms 44 hours ago 198th edsrzf 🇳🇿 0 75 17ms 29 hours ago 198th zgialor-lab 0 75 25ms 21 hours ago 210th Shanethegamer 🇺🇸 0 76 129ms 13 Dec 2024 210th ovs-code 🇩🇪 0 76 3ms 10 May 2025 210th AlephSquirrel 0 76 43ms 3 Dec 2025 210th AlephSquirrel 0 76 445ms 3 Dec 2025 210th albanian-laundromat 0 76 18ms 23 days ago 210th albanian-laundromat 0 76 188ms 17 days ago 210th MeWhenI 🇻🇦 0 76 586ms 10 days ago 210th MeWhenI 🇻🇦 0 76 184ms 15 hours ago 218th Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 218th DialFrost 🇸🇬 0 77 19ms 8 May 2025 218th Natanaelel 🇸🇪 0 77 3ms 11 May 2025 218th addmai 0 77 20ms 24 Jul 2025 218th hiichbindermax 0 77 19ms 17 Aug 2025 218th 5cw 🇺🇸 0 77 18ms 22 Aug 2025 218th davecame 0 77 135ms 25 Sep 2025 218th SirBogman 🇺🇸 0 77 240ms 13 Oct 2025 218th jtaxen 0 77 19ms 16 Oct 2025 218th albanian-laundromat 0 77 412ms 6 Dec 2025 218th Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 218th KasperKivimaeki 🇫🇮 0 77 564ms 10 days ago 218th StefanHabel 🇨🇦 0 77 1,217ms 2 days ago 218th ahmetdemirag 🇨🇾 0 77 18ms 2 days ago 218th tomh1012 0 77 17ms 2 days ago 218th qpwoeirut 0 77 20ms 34 hours ago 218th btjones0 0 77 19ms 32 hours ago 218th ComradeSquirrel 0 77 18ms 30 hours ago 218th bzijlema 🇳🇱 0 77 18ms 29 hours ago 218th Lv0Sys 🇵🇱 0 77 18ms 3 hours ago 218th duckyluuk 🇳🇱 0 77 20ms 98 mins ago 239th jameswmccarty 0 78 20ms 29 Mar 2025 239th DialFrost 🇸🇬 0 78 940ms 10 May 2025 First Prev 161–240 of 355 Next Last