The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 9 hours. Why not try and solve them ahead of time?
Tutorial in all languages in bytes. 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 Bytes Time Submitted 861st zijinoier 0 65 12ms 25 Jun 2025 861st dirckvdende 0 65 11ms 30 Jun 2025 861st BREMAUCY 🇫🇷 0 65 12ms 1 Jul 2025 861st Quentin-AC 0 65 10ms 2 Jul 2025 861st qpwoeirut 0 65 11ms 3 Jul 2025 861st jak-ch-ll 0 65 12ms 6 Jul 2025 861st anter69 🇭🇺 0 65 12ms 9 Jul 2025 861st Flekay 🇩🇪 0 65 11ms 10 Jul 2025 861st klixel 🇨🇦 0 65 10ms 11 Jul 2025 861st KasperKivimaeki 🇫🇮 0 65 10ms 15 Jul 2025 861st Nyandereian 0 65 10ms 15 Jul 2025 861st itu-itis21-akkoyuno21 0 65 11ms 15 Jul 2025 861st GrayJoKing 🇦🇺 0 65 11ms 18 Jul 2025 861st AbrahamJLR 🇻🇪 0 65 13ms 18 Jul 2025 861st RaBa21 🇭🇺 0 65 11ms 19 Jul 2025 861st jeetsh4h 0 65 10ms 19 Jul 2025 861st LostSyntax21 🇬🇧 0 65 12ms 19 Jul 2025 861st wuduculfre 0 65 12ms 21 Jul 2025 861st yjgnaw 0 65 10ms 24 Jul 2025 861st oween12 0 65 11ms 6 Aug 2025 861st xiaoyiming123 0 65 12ms 11 Aug 2025 861st EthanJantz 0 65 11ms 12 Aug 2025 861st wobblybits 0 65 13ms 14 Aug 2025 861st janlelis 0 65 12ms 14 Aug 2025 861st ShaanveerS 0 65 12ms 17 Aug 2025 861st ut0s 0 65 10ms 23 Aug 2025 861st HETHAT 🇩🇿 0 65 12ms 3 Sep 2025 861st republic82 0 65 12ms 13 Sep 2025 861st snoozingnewt 🇨🇦 0 65 8ms 15 Sep 2025 861st snoozingnewt 🇨🇦 0 65 177ms 15 Sep 2025 861st snoozingnewt 🇨🇦 0 65 11ms 15 Sep 2025 861st snoozingnewt 🇨🇦 0 65 3ms 15 Sep 2025 861st hellopir2 0 65 11ms 18 Sep 2025 861st edsrzf 🇳🇿 0 65 4ms 18 Sep 2025 861st GolfingSuccess 🇬🇷 0 65 4ms 19 Sep 2025 861st DialFrost 🇸🇬 0 65 4ms 19 Sep 2025 861st now4est 🇯🇵 0 65 12ms 21 Sep 2025 861st ahmetdemirag 🇨🇾 0 65 12ms 24 Sep 2025 861st J09M 0 65 11ms 25 Sep 2025 861st ShikChen 🇹🇼 0 65 12ms 26 Sep 2025 861st Shanethegamer 🇺🇸 0 65 4ms 28 Sep 2025 861st davecame 0 65 12ms 3 Oct 2025 861st CommandLeo 🇮🇹 0 65 12ms 4 Oct 2025 861st pixelated-pup 0 65 10ms 6 Oct 2025 861st snoozingnewt 🇨🇦 0 65 5ms 6 Oct 2025 861st luuumine 🇫🇷 0 65 12ms 8 Oct 2025 861st fvla 0 65 11ms 14 Oct 2025 861st asarvazyan 0 65 11ms 18 Oct 2025 861st intgrah 0 65 12ms 22 Oct 2025 861st Matter1024 🇮🇳 0 65 12ms 15 Nov 2025 861st j-zhang43 0 65 11ms 17 Nov 2025 861st msbranicky 0 65 7ms 18 Nov 2025 861st sunleonid 0 65 10ms 21 Nov 2025 861st MeWhenI 🇻🇦 0 65 4ms 23 Nov 2025 861st Babafaba 0 65 11ms 24 Nov 2025 861st JOrE20 0 65 11ms 25 Nov 2025 861st Emutis 🇱🇹 0 65 12ms 26 Nov 2025 861st edsrzf 🇳🇿 0 65 147ms 28 Nov 2025 861st Languag3 0 65 12ms 5 Dec 2025 861st FortuiteMan 🇫🇷 0 65 10ms 13 Dec 2025 861st yujqiao 0 65 11ms 15 Dec 2025 861st toubsen 🇩🇪 0 65 7ms 30 Dec 2025 861st HumanoidCPU 0 65 5ms 1 Jan 2026 861st HumanoidCPU 0 65 3ms 1 Jan 2026 861st jakcharvat 0 65 10ms 13 Jan 2026 861st FoxInTheClouds 0 65 10ms 30 Jan 2026 861st Steffan153 🇫🇮 0 65 10ms 11 Feb 2026 861st 5cw 🇺🇸 0 65 10ms 11 Feb 2026 861st theobori 0 65 11ms 26 days ago 861st Aquateraneal 🇺🇸 0 65 10ms 23 days ago 861st edward-Han1024 0 65 10ms 23 days ago 861st randolchance 0 65 12ms 19 days ago 861st CheeseCake628 🇳🇴 0 65 12ms 19 days ago 861st dokutan 0 65 4ms 2 days ago 1,035th Shanethegamer 🇺🇸 0 66 109ms 22 Nov 2024 1,035th GolfingSuccess 🇬🇷 0 66 88ms 25 Nov 2024 1,035th Natanaelel 🇸🇪 0 66 193ms 9 Dec 2024 1,035th MeWhenI 🇻🇦 0 66 3ms 11 Dec 2024 1,035th rollershutter 0 66 12ms 18 Dec 2024 1,035th duckyluuk 🇳🇱 0 66 2ms 12 Jan 2025 First Prev 961–1,040 of 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