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 241st Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 241st error256 0 80 466ms 16 Jan 2026 241st stefangimmillaro 0 80 19ms 26 hours ago 241st albanian-laundromat 0 80 29ms 26 hours ago 245th Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 246th bricknellj 0 82 17ms 30 Jan 2025 246th scpchicken 🇵🇼 0 82 402ms 2 days ago 246th KatieLG 🇬🇧 0 82 18ms 2 days ago 246th madex 🇩🇪 0 82 4ms 2 days ago 246th MeWhenI 🇻🇦 0 82 114ms 8 hours ago 251st GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 251st GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 251st error256 0 83 430ms 12 Jan 2026 251st albanian-laundromat 0 83 9ms 26 Jan 2026 251st edsrzf 🇳🇿 0 83 473ms 25 hours ago 251st edsrzf 🇳🇿 0 83 1,251ms 23 hours ago 257th Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 257th edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 257th albanian-laundromat 0 85 92ms 6 Dec 2025 257th GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 257th edsrzf 🇳🇿 0 85 28ms 22 hours ago 262nd kg583 🇺🇸 0 86 23ms 2 Oct 2025 262nd GolfingSuccess 🇬🇷 0 86 2,109ms 16 days ago 264th sean-niemann 🇺🇸 0 87 42ms 9 May 2025 264th error256 0 87 2,931ms 14 Jan 2026 264th IanUtley 0 87 2,957ms 16 Jan 2026 264th CaedenHarper 🇨🇦 0 87 439ms 32 hours ago 268th muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 268th solisolu 0 88 3ms 11 Nov 2025 268th albanian-laundromat 0 88 1,372ms 5 Jan 2026 271st Shanethegamer 🇺🇸 0 89 99ms 13 Dec 2024 271st GolfingSuccess 🇬🇷 0 89 64ms 12 Jan 2026 273rd sean-niemann 🇺🇸 0 90 7ms 10 May 2025 274th ovs-code 🇩🇪 0 91 261ms 13 Dec 2025 274th error256 0 91 62ms 12 Jan 2026 274th error256 0 91 293ms 14 Jan 2026 274th GolfingSuccess 🇬🇷 0 91 272ms 14 Jan 2026 274th Natanaelel 🇸🇪 0 91 333ms 40 hours ago 279th Shanethegamer 🇺🇸 0 92 462ms 20 May 2025 279th Yax42 🇫🇷 0 92 68ms 37 hours ago 279th edsrzf 🇳🇿 0 92 18ms a min ago 282nd Yax42 🇫🇷 0 93 392ms 38 hours ago 283rd Shanethegamer 🇺🇸 0 94 383ms 13 Dec 2024 283rd edsrzf 🇳🇿 0 94 459ms 20 May 2025 283rd MeWhenI 🇻🇦 0 94 396ms 11 hours ago 283rd edsrzf 🇳🇿 0 94 6ms 5 hours ago 283rd albanian-laundromat 0 94 6ms 5 hours ago 288th albanian-laundromat 0 95 114ms 6 Jan 2026 289th Shanethegamer 🇺🇸 0 96 427ms 3 Jun 2025 289th CaedenHarper 🇨🇦 0 96 416ms 33 hours ago 289th edsrzf 🇳🇿 0 96 32ms 33 hours ago 289th kumavale 0 96 155ms 3 hours ago 293rd albanian-laundromat 0 97 44ms 6 Dec 2025 293rd tomh1012 0 97 396ms 43 hours ago 295th error256 0 98 156ms 16 Jan 2026 295th albanian-laundromat 0 98 135ms 23 Feb 2026 295th edsrzf 🇳🇿 0 98 163ms 5 hours ago 298th Shanethegamer 🇺🇸 0 99 352ms 24 Sep 2025 299th edsrzf 🇳🇿 0 100 145ms 9 May 2025 299th emgordon154 0 100 7ms 9 May 2025 299th JOrE20 0 100 42ms 15 Dec 2025 302nd rucin93 🇵🇱 0 101 373ms 20 days ago 303rd fantaize 0 102 148ms 15 days ago 303rd emgordon154 0 102 4ms 28 hours ago 305th CLOStrophobic 🇮🇹 0 104 21ms 18 Jan 2025 305th kasarino 0 104 4ms 13 hours ago 307th kg583 🇺🇸 0 106 38ms 9 May 2025 308th Shanethegamer 🇺🇸 0 107 8ms 9 May 2025 308th AlephSquirrel 0 107 20ms 14 May 2025 310th CLOStrophobic 🇮🇹 0 108 47ms 17 Feb 2025 310th edsrzf 🇳🇿 0 108 1,839ms 21 May 2025 310th albanian-laundromat 0 108 31ms 5 Jan 2026 310th albanian-laundromat 0 108 83ms 16 days ago 314th kg583 🇺🇸 0 109 43ms 23 days ago 314th GolfingSuccess 🇬🇷 0 109 46ms 22 days ago 314th edsrzf 🇳🇿 0 109 43ms 26 hours ago 317th retrohun 0 111 41ms 41 hours ago 318th GolfingSuccess 🇬🇷 0 112 44ms 24 Jan 2026 318th edsrzf 🇳🇿 0 112 36ms 2 hours ago 320th Shanethegamer 🇺🇸 0 114 1,281ms 9 May 2025 First Prev 241–320 of 346 Next Last