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 641st SirBogman 🇺🇸 920 22 105ms 31 May 2022 642nd sisyphus-ppcg 🇦🇺 920 29 8ms 12 Aug 2024 642nd btnlq 920 29 8ms 14 Aug 2024 642nd DialFrost 🇸🇬 920 29 8ms 17 Aug 2024 642nd ovs-code 🇩🇪 920 29 8ms 17 Aug 2024 642nd Steffan153 🇫🇮 920 29 8ms 17 Aug 2024 642nd emgordon154 920 29 8ms 18 Sep 2024 642nd sean-niemann 🇺🇸 920 29 8ms 29 Dec 2024 649th thospel 919 29 3ms 26 Mar 2018 649th o0lit3 🇺🇸 919 29 3ms 18 Dec 2020 651st Steffan153 🇫🇮 918 35 4ms 16 Apr 2023 651st Shanethegamer 🇺🇸 918 35 4ms 17 Apr 2023 651st Lydxn 🇨🇦 918 35 4ms 18 Apr 2023 651st AlephSquirrel 918 35 4ms 20 Apr 2023 651st primo-ppcg 🇹🇭 918 35 3ms 27 Apr 2023 651st MeWhenI 🇻🇦 918 35 3ms 23 May 2023 651st GrayJoKing 🇦🇺 918 35 3ms 15 Aug 2023 651st btnlq 918 35 4ms 21 Oct 2023 651st Yewzir 🇧🇪 918 35 3ms 28 Oct 2023 651st Betuaredead 918 35 4ms 12 Nov 2023 651st edsrzf 🇳🇿 918 35 4ms 1 Nov 2024 651st emgordon154 918 35 3ms 22 Dec 2024 651st sean-niemann 🇺🇸 918 35 4ms 26 Apr 2025 651st kg583 🇺🇸 918 35 4ms 25 Sep 2025 665th Lydxn 🇨🇦 918 46 10ms 15 Nov 2021 665th lynn 918 46 9ms 15 Nov 2021 665th btnlq 918 46 9ms 15 Nov 2021 665th GrayJoKing 🇦🇺 918 46 9ms 16 Nov 2021 665th Steffan153 🇫🇮 918 46 9ms 30 Oct 2022 665th Yewzir 🇧🇪 918 46 8ms 11 Apr 2024 665th ovs-code 🇩🇪 918 46 9ms 29 Jun 2024 665th sean-niemann 🇺🇸 918 46 9ms 6 Apr 2025 673rd yokasuretsu 917 12 33ms 8 Nov 2018 673rd diddily 917 12 34ms 30 Oct 2019 673rd BBoehm 🇩🇪 917 12 33ms 29 Dec 2020 673rd Toanuvo 917 12 34ms 20 Jan 2022 673rd saltysylvi 917 12 34ms 11 Oct 2022 673rd jhonw 917 12 34ms 22 Sep 2023 673rd alphafalfa 917 12 2ms 15 Jul 2024 673rd plcc0 917 12 34ms 8 May 2025 673rd aksyristos 917 12 36ms 13 Jan 2026 673rd denkyuu1 917 12 34ms 23 Feb 2026 683rd primo-ppcg 🇹🇭 917 48 1,320ms 28 May 2021 683rd Lydxn 🇨🇦 917 48 1,300ms 25 Oct 2021 685th canissimia 🇦🇶 917 134 1ms 14 Jul 2021 686th primo-ppcg 🇹🇭 916 34 1,022ms 6 May 2022 686th HPWiz 🇳🇿 916 34 1,022ms 6 May 2022 688th kg583 🇺🇸 916 53 5ms 8 Oct 2025 689th nwellnhof 🇩🇪 916 64 363ms 21 Dec 2021 689th btnlq 916 64 417ms 10 Mar 2023 689th MeWhenI 🇻🇦 916 64 391ms 26 Jul 2023 689th sean-niemann 🇺🇸 916 64 387ms 23 Dec 2024 689th WalrusesAreAwesome 916 64 425ms 11 Jan 2025 689th prplz 🇦🇺 916 64 413ms 23 Jan 2025 689th Yax42 🇫🇷 916 64 416ms 1 Aug 2025 689th KasperKivimaeki 🇫🇮 916 64 408ms 22 Dec 2025 689th amazingalek 🇳🇴 916 64 498ms 29 Dec 2025 698th AdrienHache 🇫🇷 915 40 47ms 17 Oct 2024 699th Lydxn 🇨🇦 915 42 81ms 15 May 2022 699th GrayJoKing 🇦🇺 915 42 78ms 16 May 2022 699th Steffan153 🇫🇮 915 42 76ms 10 Dec 2022 699th JayXon 🇺🇸 915 42 76ms 20 Mar 2023 699th Yewzir 🇧🇪 915 42 77ms 9 Nov 2023 699th Betuaredead 915 42 92ms 13 Nov 2023 699th pardouin 🇫🇷 915 42 79ms 3 Sep 2024 699th DialFrost 🇸🇬 915 42 73ms 14 Nov 2024 699th sean-niemann 🇺🇸 915 42 75ms 18 Apr 2025 699th albanian-laundromat 915 42 74ms 8 Nov 2025 709th Lydxn 🇨🇦 915 54 112ms 14 Oct 2022 709th JayXon 🇺🇸 915 54 115ms 13 Jun 2023 711th MeWhenI 🇻🇦 914 30 5ms 16 Jul 2022 712th HPWiz 🇳🇿 914 31 498ms 10 May 2023 712th ovs-code 🇩🇪 914 31 499ms 24 Oct 2023 712th Codsilla 🇨🇦 914 31 508ms 31 Oct 2023 712th DialFrost 🇸🇬 914 31 535ms 5 Jan 2024 712th Steffan153 🇫🇮 914 31 512ms 17 Aug 2024 712th sean-niemann 🇺🇸 914 31 534ms 13 Mar 2025 718th sean-niemann 🇺🇸 914 39 136ms 3 Aug 2024 718th Steffan153 🇫🇮 914 39 141ms 3 Aug 2024 718th rucin93 🇵🇱 914 39 149ms 3 Aug 2024 First Prev 641–720 of 5,536 Next Last