The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Prime Numbers 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 719th rucin93 🇵🇱 914 39 149ms 3 Aug 2024 719th GrayJoKing 🇦🇺 914 39 134ms 3 Aug 2024 719th DialFrost 🇸🇬 914 39 133ms 3 Aug 2024 719th Argeento 🇵🇱 914 39 132ms 3 Aug 2024 719th JayXon 🇺🇸 914 39 135ms 4 Aug 2024 719th pardouin 🇫🇷 914 39 124ms 4 Aug 2024 719th lukegustafson 🇺🇸 914 39 126ms 4 Aug 2024 719th Lydxn 🇨🇦 914 39 134ms 5 Aug 2024 719th emplv 🇱🇻 914 39 134ms 29 Oct 2024 719th ovs-code 🇩🇪 914 39 139ms 5 Jan 2025 719th fuzzylojik-golf 🇺🇸 914 39 133ms 15 Jul 2025 719th albanian-laundromat 914 39 132ms 2 Oct 2025 719th snoozingnewt 🇨🇦 914 39 133ms 10 Dec 2025 734th saito-ta 🇯🇵 914 41 3ms 19 May 2023 735th retrohun 913 43 15ms 5 Aug 2018 735th Attero 🇸🇪 913 43 9ms 15 May 2020 735th hashkitten 913 43 16ms 24 Sep 2020 735th urojony 🇵🇱 913 43 9ms 28 Dec 2020 735th 77Tigers 913 43 11ms 4 Mar 2021 735th jacklynnepenick 913 43 11ms 14 Aug 2021 735th annaproxy 913 43 10ms 7 Dec 2021 735th emplv 🇱🇻 913 43 10ms 14 Dec 2021 735th bob-th 913 43 10ms 5 Aug 2022 735th galloj 🇨🇿 913 43 9ms 29 Aug 2022 735th MichalMarsalek 🇨🇿 913 43 10ms 14 Jan 2023 735th zbreit 🇺🇸 913 43 11ms 28 May 2023 735th heypwesto 🇳🇿 913 43 9ms 31 May 2023 735th kaptsanovb 913 43 9ms 8 Jun 2023 735th kellantech 913 43 10ms 13 Jun 2023 735th Natanaelel 🇸🇪 913 43 9ms 8 Sep 2023 735th FieryIceStickie 913 43 9ms 27 Nov 2023 735th Bulmenisaurus 913 43 17ms 4 Jun 2024 735th ahmetdemirag 🇨🇾 913 43 12ms 9 Jun 2024 735th thatbirdguythatuknownot 913 43 16ms 24 Aug 2024 735th Stockoh 🇫🇷 913 43 12ms 17 Nov 2024 735th snydej 913 43 9ms 21 Nov 2024 735th randolchance 913 43 10ms 19 Oct 2025 735th Garklein 🇨🇦 913 43 10ms 18 days ago 735th madex 🇩🇪 913 43 9ms 14 days ago 760th inventshah 913 47 2ms 9 Sep 2022 760th Lydxn 🇨🇦 913 47 2ms 9 Sep 2022 760th sisyphus-ppcg 🇦🇺 913 47 2ms 10 Sep 2022 760th JayXon 🇺🇸 913 47 2ms 10 Sep 2022 760th GrayJoKing 🇦🇺 913 47 2ms 11 Sep 2022 760th btnlq 913 47 2ms 11 Sep 2022 760th Steffan153 🇫🇮 913 47 2ms 25 Mar 2023 760th Steffan153 🇫🇮 913 47 5ms 11 Dec 2023 760th Yewzir 🇧🇪 913 47 5ms 14 Dec 2023 760th Lydxn 🇨🇦 913 47 7ms 20 Dec 2023 760th m-tkach 🇺🇦 913 47 2ms 31 Jan 2024 760th dokutan 913 47 7ms 4 May 2024 760th zacjl 913 47 5ms 11 Oct 2024 760th emgordon154 913 47 6ms 5 Dec 2024 760th error256 913 47 5ms 27 Dec 2024 760th sean-niemann 🇺🇸 913 47 2ms 1 Jan 2025 760th edsrzf 🇳🇿 913 47 6ms 12 Feb 2025 760th sean-niemann 🇺🇸 913 47 6ms 19 Apr 2025 760th Shanethegamer 🇺🇸 913 47 6ms 22 Apr 2025 760th albanian-laundromat 913 47 2ms 7 Jun 2025 760th fuzzylojik-golf 🇺🇸 913 47 2ms 18 Jul 2025 760th kg583 🇺🇸 913 47 7ms 30 Jul 2025 760th snoozingnewt 🇨🇦 913 47 2ms 13 Dec 2025 760th DialFrost 🇸🇬 913 47 2ms 31 Dec 2025 760th DialFrost 🇸🇬 913 47 5ms 1 Jan 2026 785th sisyphus-ppcg 🇦🇺 913 66 1ms 7 Jul 2022 785th m-tkach 🇺🇦 913 66 1ms 8 Mar 2023 785th orthoplex 🇨🇽 913 66 1ms 29 Jun 2023 785th UnderKoen 🇳🇱 913 66 2ms 21 May 2025 789th sisyphus-ppcg 🇦🇺 912 18 39ms 23 Jul 2022 789th HPWiz 🇳🇿 912 18 38ms 13 Oct 2022 789th primo-ppcg 🇹🇭 912 18 37ms 7 Dec 2022 789th orthoplex 🇨🇽 912 18 39ms 5 Oct 2023 789th lynn 912 18 37ms 16 Oct 2023 789th AlephSquirrel 912 18 64ms 28 Dec 2023 789th xsot 🇸🇬 912 18 39ms 9 Jun 2024 789th pardouin 🇫🇷 912 18 41ms 24 Oct 2024 789th fuzzylojik-golf 🇺🇸 912 18 39ms 4 Aug 2025 789th CaedenHarper 🇨🇦 912 18 41ms 4 Sep 2025 789th JOrE20 912 18 37ms 25 Feb 2026 800th JayXon 🇺🇸 912 48 137ms 25 Feb 2021 First Prev 721–800 of 5,537 Next Last