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 623rd Steffan153 🇫🇮 921 48 137ms 21 Feb 2026 642nd SirBogman 🇺🇸 920 22 105ms 31 May 2022 643rd sisyphus-ppcg 🇦🇺 920 29 8ms 12 Aug 2024 643rd btnlq 920 29 8ms 14 Aug 2024 643rd DialFrost 🇸🇬 920 29 8ms 17 Aug 2024 643rd ovs-code 🇩🇪 920 29 8ms 17 Aug 2024 643rd Steffan153 🇫🇮 920 29 8ms 17 Aug 2024 643rd emgordon154 920 29 8ms 18 Sep 2024 643rd sean-niemann 🇺🇸 920 29 8ms 29 Dec 2024 650th thospel 919 29 3ms 26 Mar 2018 650th o0lit3 🇺🇸 919 29 3ms 18 Dec 2020 652nd Steffan153 🇫🇮 918 35 4ms 16 Apr 2023 652nd Shanethegamer 🇺🇸 918 35 4ms 17 Apr 2023 652nd Lydxn 🇨🇦 918 35 4ms 18 Apr 2023 652nd AlephSquirrel 918 35 4ms 20 Apr 2023 652nd primo-ppcg 🇹🇭 918 35 3ms 27 Apr 2023 652nd MeWhenI 🇻🇦 918 35 3ms 23 May 2023 652nd GrayJoKing 🇦🇺 918 35 3ms 15 Aug 2023 652nd btnlq 918 35 4ms 21 Oct 2023 652nd Yewzir 🇧🇪 918 35 3ms 28 Oct 2023 652nd Betuaredead 918 35 4ms 12 Nov 2023 652nd edsrzf 🇳🇿 918 35 4ms 1 Nov 2024 652nd emgordon154 918 35 3ms 22 Dec 2024 652nd sean-niemann 🇺🇸 918 35 4ms 26 Apr 2025 652nd kg583 🇺🇸 918 35 4ms 25 Sep 2025 666th Lydxn 🇨🇦 918 46 10ms 15 Nov 2021 666th lynn 918 46 9ms 15 Nov 2021 666th btnlq 918 46 9ms 15 Nov 2021 666th GrayJoKing 🇦🇺 918 46 9ms 16 Nov 2021 666th Steffan153 🇫🇮 918 46 9ms 30 Oct 2022 666th Yewzir 🇧🇪 918 46 8ms 11 Apr 2024 666th ovs-code 🇩🇪 918 46 9ms 29 Jun 2024 666th sean-niemann 🇺🇸 918 46 9ms 6 Apr 2025 674th yokasuretsu 917 12 33ms 8 Nov 2018 674th diddily 917 12 34ms 30 Oct 2019 674th BBoehm 🇩🇪 917 12 33ms 29 Dec 2020 674th Toanuvo 917 12 34ms 20 Jan 2022 674th saltysylvi 917 12 34ms 11 Oct 2022 674th jhonw 917 12 34ms 22 Sep 2023 674th alphafalfa 917 12 2ms 15 Jul 2024 674th plcc0 917 12 34ms 8 May 2025 674th aksyristos 917 12 36ms 13 Jan 2026 674th denkyuu1 917 12 34ms 23 Feb 2026 684th primo-ppcg 🇹🇭 917 48 1,320ms 28 May 2021 684th Lydxn 🇨🇦 917 48 1,300ms 25 Oct 2021 686th canissimia 🇦🇶 917 134 1ms 14 Jul 2021 687th primo-ppcg 🇹🇭 916 34 1,022ms 6 May 2022 687th HPWiz 🇳🇿 916 34 1,022ms 6 May 2022 689th kg583 🇺🇸 916 53 5ms 8 Oct 2025 690th nwellnhof 🇩🇪 916 64 363ms 21 Dec 2021 690th btnlq 916 64 417ms 10 Mar 2023 690th MeWhenI 🇻🇦 916 64 391ms 26 Jul 2023 690th sean-niemann 🇺🇸 916 64 387ms 23 Dec 2024 690th WalrusesAreAwesome 916 64 425ms 11 Jan 2025 690th prplz 🇦🇺 916 64 413ms 23 Jan 2025 690th Yax42 🇫🇷 916 64 416ms 1 Aug 2025 690th KasperKivimaeki 🇫🇮 916 64 408ms 22 Dec 2025 690th amazingalek 🇳🇴 916 64 498ms 29 Dec 2025 699th AdrienHache 🇫🇷 915 40 47ms 17 Oct 2024 700th Lydxn 🇨🇦 915 42 81ms 15 May 2022 700th GrayJoKing 🇦🇺 915 42 78ms 16 May 2022 700th Steffan153 🇫🇮 915 42 76ms 10 Dec 2022 700th JayXon 🇺🇸 915 42 76ms 20 Mar 2023 700th Yewzir 🇧🇪 915 42 77ms 9 Nov 2023 700th Betuaredead 915 42 92ms 13 Nov 2023 700th pardouin 🇫🇷 915 42 79ms 3 Sep 2024 700th DialFrost 🇸🇬 915 42 73ms 14 Nov 2024 700th sean-niemann 🇺🇸 915 42 75ms 18 Apr 2025 700th albanian-laundromat 915 42 74ms 8 Nov 2025 710th Lydxn 🇨🇦 915 54 112ms 14 Oct 2022 710th JayXon 🇺🇸 915 54 115ms 13 Jun 2023 712th MeWhenI 🇻🇦 914 30 5ms 16 Jul 2022 713th HPWiz 🇳🇿 914 31 498ms 10 May 2023 713th ovs-code 🇩🇪 914 31 499ms 24 Oct 2023 713th Codsilla 🇨🇦 914 31 508ms 31 Oct 2023 713th DialFrost 🇸🇬 914 31 535ms 5 Jan 2024 713th Steffan153 🇫🇮 914 31 512ms 17 Aug 2024 713th sean-niemann 🇺🇸 914 31 534ms 13 Mar 2025 719th sean-niemann 🇺🇸 914 39 136ms 3 Aug 2024 719th Steffan153 🇫🇮 914 39 141ms 3 Aug 2024 First Prev 641–720 of 5,537 Next Last