The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 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 156th albanian-laundromat 0 75 108ms 5 Jan 2026 156th albanian-laundromat 0 75 455ms 6 Jan 2026 156th GolfingSuccess 🇬🇷 0 75 18ms 11 Jan 2026 156th albanian-laundromat 0 75 238ms 21 days ago 156th madex 🇩🇪 0 75 18ms 5 days ago 156th CaedenHarper 🇨🇦 0 75 149ms 2 days ago 167th Shanethegamer 🇺🇸 0 76 129ms 13 Dec 2024 167th edsrzf 🇳🇿 0 76 114ms 10 May 2025 167th ovs-code 🇩🇪 0 76 3ms 10 May 2025 167th AlephSquirrel 0 76 43ms 3 Dec 2025 167th AlephSquirrel 0 76 445ms 3 Dec 2025 167th albanian-laundromat 0 76 18ms 21 days ago 167th albanian-laundromat 0 76 188ms 15 days ago 167th MeWhenI 🇻🇦 0 76 588ms 8 days ago 175th Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 175th DialFrost 🇸🇬 0 77 19ms 8 May 2025 175th edsrzf 🇳🇿 0 77 1,938ms 9 May 2025 175th Natanaelel 🇸🇪 0 77 3ms 11 May 2025 175th addmai 0 77 20ms 24 Jul 2025 175th hiichbindermax 0 77 19ms 17 Aug 2025 175th 5cw 🇺🇸 0 77 18ms 22 Aug 2025 175th davecame 0 77 150ms 25 Sep 2025 175th SirBogman 🇺🇸 0 77 240ms 13 Oct 2025 175th jtaxen 0 77 19ms 16 Oct 2025 175th albanian-laundromat 0 77 412ms 6 Dec 2025 175th Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 175th KasperKivimaeki 🇫🇮 0 77 564ms 8 days ago 175th StefanHabel 🇨🇦 0 77 1,207ms 7 hours ago 175th Emutis 🇱🇹 0 77 155ms 2 hours ago 175th ahmetdemirag 🇨🇾 0 77 18ms 2 hours ago 175th tomh1012 0 77 17ms 19 mins ago 192nd jameswmccarty 0 78 20ms 29 Mar 2025 192nd DialFrost 🇸🇬 0 78 940ms 10 May 2025 192nd DialFrost 🇸🇬 0 78 3ms 10 May 2025 192nd solisolu 0 78 20ms 10 Nov 2025 196th KasperKivimaeki 🇫🇮 0 79 3ms 1 Nov 2025 196th BREMAUCY 🇫🇷 0 79 19ms 3 hours ago 198th Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 198th error256 0 80 466ms 16 Jan 2026 198th madex 🇩🇪 0 80 378ms 6 hours ago 201st Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 202nd bricknellj 0 82 17ms 30 Jan 2025 202nd scpchicken 🇵🇼 0 82 402ms 13 hours ago 202nd KatieLG 🇬🇧 0 82 18ms 13 hours ago 202nd madex 🇩🇪 0 82 4ms 6 hours ago 206th GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 206th GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 206th error256 0 83 430ms 12 Jan 2026 206th albanian-laundromat 0 83 9ms 26 Jan 2026 210th Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 210th edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 210th albanian-laundromat 0 85 92ms 6 Dec 2025 210th GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 214th kg583 🇺🇸 0 86 23ms 2 Oct 2025 214th GolfingSuccess 🇬🇷 0 86 2,109ms 15 days ago 216th sean-niemann 🇺🇸 0 87 42ms 9 May 2025 216th error256 0 87 2,931ms 14 Jan 2026 216th IanUtley 0 87 2,957ms 16 Jan 2026 219th edsrzf 🇳🇿 0 88 2,094ms 15 May 2025 219th muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 219th solisolu 0 88 3ms 11 Nov 2025 219th albanian-laundromat 0 88 1,372ms 5 Jan 2026 223rd Shanethegamer 🇺🇸 0 89 99ms 13 Dec 2024 223rd GolfingSuccess 🇬🇷 0 89 65ms 12 Jan 2026 225th sean-niemann 🇺🇸 0 90 7ms 10 May 2025 226th ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 226th error256 0 91 57ms 12 Jan 2026 226th error256 0 91 293ms 14 Jan 2026 226th GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 230th Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 231st Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 231st edsrzf 🇳🇿 0 94 459ms 20 May 2025 233rd albanian-laundromat 0 95 114ms 6 Jan 2026 234th Natanaelel 🇸🇪 0 96 266ms 8 May 2025 234th stefangimmillaro 0 96 20ms 10 May 2025 234th Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 234th albanian-laundromat 0 96 5ms 6 Dec 2025 234th MeWhenI 🇻🇦 0 96 399ms 8 days ago 239th edsrzf 🇳🇿 0 97 512ms 24 Sep 2025 239th albanian-laundromat 0 97 44ms 6 Dec 2025 First Prev 161–240 of 283 Next Last