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 878th proton 🇩🇪 903 33 40ms 9 Jun 2020 878th biinari 903 33 41ms 2 Aug 2020 878th Waffle3z 903 33 37ms 12 Oct 2020 878th fitzdotlol 🇺🇸 903 33 40ms 27 Jan 2021 878th kirbyyourmom 🇬🇧 903 33 39ms 25 Feb 2021 878th rbviz 903 33 41ms 28 Mar 2021 878th XorZy 903 33 40ms 24 May 2021 878th Luj8n 903 33 42ms 19 Sep 2021 878th aryavsaigal 903 33 45ms 28 Feb 2022 878th Shanethegamer 🇺🇸 903 33 37ms 21 Apr 2022 878th Mortis66666 903 33 38ms 28 Jun 2022 878th OhmNomNom 903 33 33ms 30 Oct 2022 878th retrohun 903 33 41ms 8 Jan 2023 878th mnbvczx 🇰🇷 903 33 39ms 12 Mar 2023 878th AlephSquirrel 903 33 38ms 14 Apr 2023 878th FortuiteMan 🇫🇷 903 33 40ms 11 Sep 2023 878th aaronze 🇦🇺 903 33 40ms 21 Sep 2023 878th FlyingPenguin223 903 33 36ms 16 Nov 2023 878th ngthanhtrung23 903 33 37ms 15 Mar 2024 878th LostSyntax21 🇬🇧 903 33 41ms 24 Jul 2025 878th Thinkr1 903 33 42ms 2 Feb 2026 902nd primo-ppcg 🇹🇭 903 76 59ms 18 Jan 2022 902nd inventshah 903 76 62ms 22 Nov 2022 902nd KasperKivimaeki 🇫🇮 903 76 446ms 19 Nov 2025 905th Yewzir 🇧🇪 902 51 2ms 18 Nov 2025 905th sean-niemann 🇺🇸 902 51 1ms 18 Nov 2025 905th rucin93 🇵🇱 902 51 2ms 18 Nov 2025 905th JayXon 🇺🇸 902 51 1ms 19 Nov 2025 905th Steffan153 🇫🇮 902 51 1ms 13 Feb 2026 905th DialFrost 🇸🇬 902 51 1ms 16 Feb 2026 911th Attero 🇸🇪 902 65 373ms 21 Nov 2021 911th billings7 🇬🇧 902 65 373ms 21 Nov 2021 911th KatieLG 🇬🇧 902 65 353ms 21 Nov 2021 911th primo-ppcg 🇹🇭 902 65 377ms 21 Nov 2021 911th tomtheisen 🇺🇸 902 65 387ms 21 Nov 2021 911th roavin 902 65 369ms 29 Jun 2022 911th annaproxy 902 65 402ms 19 May 2023 911th b-illy 🇬🇧 902 65 402ms 21 Jan 2025 911th albanian-laundromat 902 65 415ms 24 Dec 2025 911th DialFrost 🇸🇬 902 65 375ms 31 Dec 2025 921st sisyphus-ppcg 🇦🇺 902 66 1ms 13 May 2022 921st GolfingSuccess 🇬🇷 902 66 1ms 13 May 2022 921st MeWhenI 🇻🇦 902 66 1ms 18 May 2022 921st saito-ta 🇯🇵 902 66 1ms 20 May 2022 921st ovs-code 🇩🇪 902 66 1ms 20 May 2022 921st inventshah 902 66 1ms 22 May 2022 921st lynn 902 66 1ms 27 May 2022 921st Natanaelel 🇸🇪 902 66 1ms 29 May 2022 921st nwellnhof 🇩🇪 902 66 1ms 8 Jul 2022 921st galloj 🇨🇿 902 66 1ms 29 Aug 2022 921st retrohun 902 66 1ms 1 Jan 2023 921st Steffan153 🇫🇮 902 66 1ms 28 Jan 2023 921st btnlq 902 66 1ms 16 May 2023 921st sean-niemann 🇺🇸 902 66 1ms 20 May 2023 921st JayXon 🇺🇸 902 66 1ms 25 May 2023 921st Lydxn 🇨🇦 902 66 2ms 24 Jun 2023 921st dokutan 902 66 1ms 2 Oct 2023 921st kritixilithos 902 66 1ms 19 May 2024 921st pardouin 🇫🇷 902 66 1ms 21 Sep 2024 921st DialFrost 🇸🇬 902 66 1ms 5 Jan 2025 921st stefangimmillaro 902 66 1ms 14 Jul 2025 921st fuzzylojik-golf 🇺🇸 902 66 1ms 2 Sep 2025 943rd frankgraziano 902 108 10ms 11 Aug 2025 943rd primo-ppcg 🇹🇭 902 108 10ms 13 Aug 2025 943rd DialFrost 🇸🇬 902 108 10ms 13 Aug 2025 946th prplz 🇦🇺 901 43 1ms 24 Oct 2020 947th m-tkach 🇺🇦 901 74 25ms 31 Mar 2022 948th lifthrasiir 🇰🇷 900 54 7ms 11 Dec 2024 948th jared-hughes 900 54 7ms 18 Dec 2024 950th msbranicky 900 95 293ms 8 Sep 2023 951st btnlq 898 40 2ms 4 Nov 2022 951st xsot 🇸🇬 898 40 2ms 13 Jul 2023 951st fuzzylojik-golf 🇺🇸 898 40 3ms 7 Aug 2025 954th MeWhenI 🇻🇦 898 47 13ms 15 Nov 2021 954th sisyphus-ppcg 🇦🇺 898 47 15ms 16 Nov 2021 954th JayXon 🇺🇸 898 47 14ms 19 Nov 2021 954th annaproxy 898 47 13ms 29 Jan 2022 954th SirBogman 🇺🇸 898 47 13ms 22 Oct 2022 954th IanUtley 898 47 14ms 16 Nov 2022 954th scpchicken 🇵🇼 898 47 9ms 16 Mar 2023 First Prev 881–960 of 5,537 Next Last