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 69 410ms 2 days ago 159th edsrzf 🇳🇿 0 69 394ms 10 hours ago 163rd btnlq 0 70 193ms 4 Dec 2024 163rd kg583 🇺🇸 0 70 128ms 3 Oct 2025 163rd error256 0 70 133ms 15 Jan 2026 163rd error256 0 70 18ms 12 days ago 167th GolfingSuccess 🇬🇷 0 71 4ms 12 Jan 2026 167th GolfingSuccess 🇬🇷 0 71 24ms 12 Jan 2026 167th GolfingSuccess 🇬🇷 0 71 18ms 14 Jan 2026 167th ovs-code 🇩🇪 0 71 134ms 23 hours ago 167th edsrzf 🇳🇿 0 71 18ms 15 hours ago 167th kg583 🇺🇸 0 71 18ms 14 hours ago 167th rhdqor213 0 71 4ms 9 hours ago 174th rucin93 🇵🇱 0 72 9ms 18 days ago 174th aksyristos 0 72 247ms 13 days ago 174th blaztoma 🇱🇹 0 72 123ms 27 hours ago 174th Emutis 🇱🇹 0 72 121ms 26 hours ago 174th KasperKivimaeki 🇫🇮 0 72 4ms 21 hours ago 174th edsrzf 🇳🇿 0 72 9ms 8 hours ago 180th IISResetMe 0 73 310ms 10 Jan 2026 181st saito-ta 🇯🇵 0 74 3ms 11 May 2025 181st error256 0 74 3ms 12 Jan 2026 181st dokutan 0 74 65ms 8 Feb 2026 181st lukegustafson 🇺🇸 0 74 189ms 16 days ago 181st albanian-laundromat 0 74 9ms 8 days ago 186th Shanethegamer 🇺🇸 0 75 71ms 7 May 2025 186th Natanaelel 🇸🇪 0 75 19ms 11 May 2025 186th commandz0 🇺🇸 0 75 1,210ms 27 Aug 2025 186th albanian-laundromat 0 75 108ms 5 Jan 2026 186th albanian-laundromat 0 75 455ms 6 Jan 2026 186th GolfingSuccess 🇬🇷 0 75 18ms 11 Jan 2026 186th albanian-laundromat 0 75 238ms 22 days ago 186th madex 🇩🇪 0 75 18ms 6 days ago 186th CaedenHarper 🇨🇦 0 75 149ms 3 days ago 186th Yax42 🇫🇷 0 75 4ms 23 hours ago 186th edsrzf 🇳🇿 0 75 17ms 8 hours ago 186th zgialor-lab 0 75 25ms 13 mins ago 198th Shanethegamer 🇺🇸 0 76 129ms 13 Dec 2024 198th ovs-code 🇩🇪 0 76 3ms 10 May 2025 198th AlephSquirrel 0 76 43ms 3 Dec 2025 198th AlephSquirrel 0 76 445ms 3 Dec 2025 198th albanian-laundromat 0 76 18ms 22 days ago 198th albanian-laundromat 0 76 188ms 16 days ago 198th MeWhenI 🇻🇦 0 76 586ms 9 days ago 205th Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 205th DialFrost 🇸🇬 0 77 19ms 8 May 2025 205th Natanaelel 🇸🇪 0 77 3ms 11 May 2025 205th addmai 0 77 20ms 24 Jul 2025 205th hiichbindermax 0 77 19ms 17 Aug 2025 205th 5cw 🇺🇸 0 77 18ms 22 Aug 2025 205th davecame 0 77 135ms 25 Sep 2025 205th SirBogman 🇺🇸 0 77 240ms 13 Oct 2025 205th jtaxen 0 77 19ms 16 Oct 2025 205th albanian-laundromat 0 77 412ms 6 Dec 2025 205th Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 205th KasperKivimaeki 🇫🇮 0 77 564ms 9 days ago 205th StefanHabel 🇨🇦 0 77 1,207ms 35 hours ago 205th ahmetdemirag 🇨🇾 0 77 18ms 30 hours ago 205th tomh1012 0 77 17ms 28 hours ago 205th qpwoeirut 0 77 20ms 13 hours ago 205th btjones0 0 77 19ms 11 hours ago 205th ComradeSquirrel 0 77 18ms 9 hours ago 205th bzijlema 🇳🇱 0 77 18ms 8 hours ago 224th jameswmccarty 0 78 20ms 29 Mar 2025 224th DialFrost 🇸🇬 0 78 940ms 10 May 2025 224th DialFrost 🇸🇬 0 78 3ms 10 May 2025 224th solisolu 0 78 20ms 10 Nov 2025 228th BREMAUCY 🇫🇷 0 79 18ms 31 hours ago 228th Andrey2001 0 79 18ms 25 hours ago 228th edsrzf 🇳🇿 0 79 30ms 7 hours ago 231st Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 231st error256 0 80 466ms 16 Jan 2026 231st madex 🇩🇪 0 80 378ms 34 hours ago 231st stefangimmillaro 0 80 19ms 12 hours ago 231st albanian-laundromat 0 80 28ms 12 hours ago 236th Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 237th bricknellj 0 82 17ms 30 Jan 2025 237th scpchicken 🇵🇼 0 82 402ms 42 hours ago 237th KatieLG 🇬🇧 0 82 18ms 42 hours ago 237th madex 🇩🇪 0 82 4ms 34 hours ago First Prev 161–240 of 330 Next Last