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 160th rucin93 🇵🇱 0 72 9ms 17 days ago 160th aksyristos 0 72 247ms 13 days ago 160th blaztoma 🇱🇹 0 72 123ms 13 hours ago 160th Emutis 🇱🇹 0 72 121ms 12 hours ago 160th KasperKivimaeki 🇫🇮 0 72 4ms 7 hours ago 166th IISResetMe 0 73 310ms 10 Jan 2026 167th rhdqor213 0 74 3ms 11 May 2025 167th saito-ta 🇯🇵 0 74 3ms 11 May 2025 167th error256 0 74 3ms 12 Jan 2026 167th dokutan 0 74 65ms 8 Feb 2026 167th lukegustafson 🇺🇸 0 74 189ms 15 days ago 167th albanian-laundromat 0 74 9ms 7 days ago 173rd Shanethegamer 🇺🇸 0 75 71ms 7 May 2025 173rd Natanaelel 🇸🇪 0 75 19ms 11 May 2025 173rd commandz0 🇺🇸 0 75 1,210ms 27 Aug 2025 173rd albanian-laundromat 0 75 108ms 5 Jan 2026 173rd albanian-laundromat 0 75 455ms 6 Jan 2026 173rd GolfingSuccess 🇬🇷 0 75 18ms 11 Jan 2026 173rd albanian-laundromat 0 75 238ms 22 days ago 173rd madex 🇩🇪 0 75 18ms 6 days ago 173rd CaedenHarper 🇨🇦 0 75 149ms 3 days ago 173rd Yax42 🇫🇷 0 75 4ms 9 hours ago 183rd Shanethegamer 🇺🇸 0 76 129ms 13 Dec 2024 183rd edsrzf 🇳🇿 0 76 114ms 10 May 2025 183rd ovs-code 🇩🇪 0 76 3ms 10 May 2025 183rd AlephSquirrel 0 76 43ms 3 Dec 2025 183rd AlephSquirrel 0 76 445ms 3 Dec 2025 183rd albanian-laundromat 0 76 18ms 22 days ago 183rd albanian-laundromat 0 76 188ms 16 days ago 183rd MeWhenI 🇻🇦 0 76 586ms 9 days ago 191st Shanethegamer 🇺🇸 0 77 19ms 13 Dec 2024 191st DialFrost 🇸🇬 0 77 19ms 8 May 2025 191st edsrzf 🇳🇿 0 77 1,938ms 9 May 2025 191st Natanaelel 🇸🇪 0 77 3ms 11 May 2025 191st addmai 0 77 20ms 24 Jul 2025 191st hiichbindermax 0 77 19ms 17 Aug 2025 191st 5cw 🇺🇸 0 77 18ms 22 Aug 2025 191st davecame 0 77 150ms 25 Sep 2025 191st SirBogman 🇺🇸 0 77 240ms 13 Oct 2025 191st jtaxen 0 77 19ms 16 Oct 2025 191st albanian-laundromat 0 77 412ms 6 Dec 2025 191st Matter1024 🇮🇳 0 77 17ms 12 Feb 2026 191st KasperKivimaeki 🇫🇮 0 77 564ms 9 days ago 191st StefanHabel 🇨🇦 0 77 1,207ms 21 hours ago 191st ahmetdemirag 🇨🇾 0 77 18ms 16 hours ago 191st tomh1012 0 77 17ms 14 hours ago 207th jameswmccarty 0 78 20ms 29 Mar 2025 207th DialFrost 🇸🇬 0 78 940ms 10 May 2025 207th DialFrost 🇸🇬 0 78 3ms 10 May 2025 207th solisolu 0 78 20ms 10 Nov 2025 211th BREMAUCY 🇫🇷 0 79 18ms 17 hours ago 211th Andrey2001 0 79 18ms 11 hours ago 213th Shanethegamer 🇺🇸 0 80 5ms 3 Jun 2025 213th error256 0 80 466ms 16 Jan 2026 213th madex 🇩🇪 0 80 378ms 20 hours ago 216th Shanethegamer 🇺🇸 0 81 348ms 3 Jun 2025 217th bricknellj 0 82 17ms 30 Jan 2025 217th scpchicken 🇵🇼 0 82 402ms 28 hours ago 217th KatieLG 🇬🇧 0 82 18ms 28 hours ago 217th madex 🇩🇪 0 82 4ms 20 hours ago 221st GolfingSuccess 🇬🇷 0 83 114ms 12 Jan 2026 221st GolfingSuccess 🇬🇷 0 83 386ms 12 Jan 2026 221st error256 0 83 430ms 12 Jan 2026 221st albanian-laundromat 0 83 9ms 26 Jan 2026 225th Shanethegamer 🇺🇸 0 85 6ms 13 Dec 2024 225th edsrzf 🇳🇿 0 85 1,065ms 25 May 2025 225th albanian-laundromat 0 85 92ms 6 Dec 2025 225th GolfingSuccess 🇬🇷 0 85 25ms 14 Jan 2026 229th kg583 🇺🇸 0 86 23ms 2 Oct 2025 229th GolfingSuccess 🇬🇷 0 86 2,109ms 15 days ago 231st sean-niemann 🇺🇸 0 87 42ms 9 May 2025 231st error256 0 87 2,931ms 14 Jan 2026 231st IanUtley 0 87 2,957ms 16 Jan 2026 231st CaedenHarper 🇨🇦 0 87 439ms 3 hours ago 235th edsrzf 🇳🇿 0 88 2,094ms 15 May 2025 235th muser-logiccpu 🇺🇦 0 88 72ms 2 Sep 2025 235th solisolu 0 88 3ms 11 Nov 2025 235th albanian-laundromat 0 88 1,372ms 5 Jan 2026 235th edsrzf 🇳🇿 0 88 26ms 7 hours ago 240th Shanethegamer 🇺🇸 0 89 99ms 13 Dec 2024 First Prev 161–240 of 306 Next Last