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 Encoder 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 241st kg583 🇺🇸 0 71 27ms 1 Dec 2024 241st CLOStrophobic 🇮🇹 0 71 13ms 18 Jan 2025 241st GolfingSuccess 🇬🇷 0 71 14ms 7 May 2025 241st edsrzf 🇳🇿 0 71 14ms 8 May 2025 241st AlephSquirrel 0 71 13ms 9 May 2025 246th Shanethegamer 🇺🇸 0 72 27ms 9 Dec 2024 247th GolfingSuccess 🇬🇷 0 73 16ms 8 May 2025 248th Shanethegamer 🇺🇸 0 75 99ms 26 Nov 2024 248th sean-niemann 🇺🇸 0 75 103ms 8 May 2025 250th GolfingSuccess 🇬🇷 0 76 133ms 28 Nov 2025 250th fuzzylojik-golf 🇺🇸 0 76 104ms 31 hours ago 250th edsrzf 🇳🇿 0 76 131ms 22 hours ago 250th emgordon154 0 76 115ms 3 hours ago 254th rucin93 🇵🇱 0 77 130ms 8 May 2025 254th Shanethegamer 🇺🇸 0 77 146ms 12 Nov 2025 256th saito-ta 🇯🇵 0 78 4ms 10 May 2025 256th rhdqor213 0 78 4ms 10 May 2025 256th albanian-laundromat 0 78 100ms 3 days ago 259th sean-niemann 🇺🇸 0 80 455ms 8 May 2025 260th kumavale 0 81 156ms 26 Nov 2025 260th Matter1024 🇮🇳 0 81 45ms 14 Feb 2026 260th albanian-laundromat 0 81 45ms 3 days ago 263rd GolfingSuccess 🇬🇷 0 82 502ms 8 May 2025 263rd emgordon154 0 82 162ms 14 Feb 2026 263rd emgordon154 0 82 518ms 5 hours ago 266th Shanethegamer 🇺🇸 0 83 484ms 26 Nov 2024 266th edsrzf 🇳🇿 0 83 414ms 9 Jul 2025 266th Shanethegamer 🇺🇸 0 83 403ms 9 Jul 2025 266th fantaize 0 83 156ms 14 days ago 266th GolfingSuccess 🇬🇷 0 83 33ms 4 hours ago 271st Shanethegamer 🇺🇸 0 84 416ms 26 Nov 2024 271st ovs-code 🇩🇪 0 84 12ms 10 May 2025 271st fuzzylojik-golf 🇺🇸 0 84 444ms 31 hours ago 271st MeWhenI 🇻🇦 0 84 215ms 6 hours ago 275th edsrzf 🇳🇿 0 85 42ms 8 May 2025 275th edsrzf 🇳🇿 0 85 18ms 9 May 2025 275th error256 0 85 18ms 10 May 2025 275th GolfingSuccess 🇬🇷 0 85 3ms 14 Jan 2026 275th KasperKivimaeki 🇫🇮 0 85 12ms 45 mins ago 280th Shanethegamer 🇺🇸 0 86 147ms 17 Dec 2024 280th kg583 🇺🇸 0 86 39ms 16 Feb 2025 280th GolfingSuccess 🇬🇷 0 86 44ms 7 May 2025 280th GolfingSuccess 🇬🇷 0 86 2,577ms 8 May 2025 280th edsrzf 🇳🇿 0 86 155ms 9 May 2025 280th sean-niemann 🇺🇸 0 86 496ms 25 Sep 2025 280th GolfingSuccess 🇬🇷 0 86 8ms 12 Nov 2025 280th MeWhenI 🇻🇦 0 86 381ms 21 Nov 2025 280th GolfingSuccess 🇬🇷 0 86 399ms 12 Jan 2026 280th elgan65536 🇺🇸 0 86 168ms 24 days ago 280th CaedenHarper 🇨🇦 0 86 399ms 3 days ago 280th CaedenHarper 🇨🇦 0 86 153ms 2 days ago 280th edsrzf 🇳🇿 0 86 414ms 4 hours ago 293rd Shanethegamer 🇺🇸 0 87 42ms 15 Apr 2025 293rd GolfingSuccess 🇬🇷 0 87 18ms 8 May 2025 293rd Shanethegamer 🇺🇸 0 87 20ms 8 May 2025 293rd albanian-laundromat 0 87 1,424ms 3 days ago 293rd Yax42 🇫🇷 0 87 2,430ms 13 hours ago 298th GolfingSuccess 🇬🇷 0 88 5ms 12 Nov 2025 298th kg583 🇺🇸 0 88 23ms 12 Feb 2026 298th fuzzylojik-golf 🇺🇸 0 88 152ms 28 hours ago 301st Shanethegamer 🇺🇸 0 89 341ms 6 May 2025 301st Shanethegamer 🇺🇸 0 89 511ms 24 Sep 2025 301st DialFrost 🇸🇬 0 89 367ms 21 Nov 2025 301st CaedenHarper 🇨🇦 0 89 103ms 2 days ago 301st emgordon154 0 89 400ms 5 hours ago 306th Yax42 🇫🇷 0 90 13ms 13 hours ago 307th GolfingSuccess 🇬🇷 0 91 14ms 13 Dec 2025 308th namelessiw 0 92 504ms 10 Oct 2025 308th fuzzylojik-golf 🇺🇸 0 92 390ms 29 hours ago 308th madex 🇩🇪 0 92 12ms 8 hours ago 311th edsrzf 🇳🇿 0 93 187ms 17 May 2025 311th CaedenHarper 🇨🇦 0 93 13ms 3 days ago 313th DialFrost 🇸🇬 0 94 13ms 10 May 2025 314th Yax42 🇫🇷 0 95 389ms 13 hours ago 315th GolfingSuccess 🇬🇷 0 96 182ms 7 May 2025 315th HumanoidCPU 0 96 160ms 7 hours ago 317th Shanethegamer 🇺🇸 0 98 7ms 6 May 2025 318th snydej 0 99 43ms 22 Nov 2024 318th albanian-laundromat 0 99 343ms 3 days ago 320th dokutan 0 100 370ms 13 hours ago First Prev 241–320 of 360 Next Last