The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Emirp 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 319th MeWhenI 🇻🇦 906 125 1ms 18 May 2022 319th ovs-code 🇩🇪 906 125 1ms 20 May 2022 319th inventshah 906 125 1ms 22 May 2022 319th lynn 906 125 1ms 27 May 2022 319th nwellnhof 🇩🇪 906 125 1ms 7 Jul 2022 319th galloj 🇨🇿 906 125 1ms 29 Aug 2022 319th Steffan153 🇫🇮 906 125 1ms 28 Jan 2023 319th btnlq 906 125 1ms 17 May 2023 319th sean-niemann 🇺🇸 906 125 1ms 20 May 2023 319th JayXon 🇺🇸 906 125 1ms 25 May 2023 319th Lydxn 🇨🇦 906 125 1ms 24 Jun 2023 319th dokutan 906 125 1ms 2 Oct 2023 319th retrohun 906 125 1ms 22 Jan 2024 319th kritixilithos 906 125 1ms 22 May 2024 319th pardouin 🇫🇷 906 125 1ms 21 Sep 2024 319th DialFrost 🇸🇬 906 125 1ms 5 Jan 2025 319th stefangimmillaro 906 125 1ms 14 Jul 2025 319th fuzzylojik-golf 🇺🇸 906 125 1ms 2 Sep 2025 339th primo-ppcg 🇹🇭 904 79 14ms 11 Feb 2022 340th Lydxn 🇨🇦 904 82 35ms 21 Jun 2022 341st primo-ppcg 🇹🇭 903 72 4ms 19 Jun 2023 342nd kg583 🇺🇸 903 73 7ms 2 Aug 2025 342nd Steffan153 🇫🇮 903 73 6ms 17 hours ago 344th Lydxn 🇨🇦 903 78 126ms 13 Jan 2021 344th prplz 🇦🇺 903 78 124ms 10 Jul 2021 344th MeWhenI 🇻🇦 903 78 131ms 4 Jan 2022 344th GrayJoKing 🇦🇺 903 78 125ms 9 Apr 2022 344th primo-ppcg 🇹🇭 903 78 122ms 18 Jun 2022 349th stefangimmillaro 903 90 38ms 26 May 2024 350th andersk 🇺🇸 903 104 121ms 8 Nov 2022 350th edsrzf 🇳🇿 903 104 131ms 8 Jun 2025 352nd jared-hughes 903 107 7ms 17 Dec 2024 352nd lifthrasiir 🇰🇷 903 107 7ms 19 Dec 2024 354th frankgraziano 902 173 10ms 11 Aug 2025 354th primo-ppcg 🇹🇭 902 173 10ms 13 Aug 2025 354th DialFrost 🇸🇬 902 173 10ms 13 Aug 2025 357th scpchicken 🇵🇼 900 43 129ms 22 Feb 2023 358th nwellnhof 🇩🇪 900 73 9ms 31 Dec 2020 358th lynn 900 73 10ms 10 Mar 2021 358th Bmrl7 900 73 12ms 26 Feb 2024 358th snoozingnewt 🇨🇦 900 73 10ms 28 Nov 2025 358th firegene 🇮🇪 900 73 11ms 24 Feb 2026 363rd ovs-code 🇩🇪 899 63 34ms 22 Feb 2025 364th prplz 🇦🇺 899 71 11ms 5 Jun 2021 364th Irratix 🇳🇱 899 71 11ms 23 May 2022 364th dmrichwa 🇺🇸 899 71 9ms 9 Oct 2022 367th Lydxn 🇨🇦 899 101 28ms 29 Jan 2023 367th GrayJoKing 🇦🇺 899 101 29ms 23 Mar 2023 367th lynn 899 101 28ms 20 Jul 2023 370th pardouin 🇫🇷 899 120 313ms 22 Oct 2024 371st prplz 🇦🇺 898 62 248ms 13 Dec 2020 372nd MeWhenI 🇻🇦 898 74 5ms 17 Dec 2024 373rd JayXon 🇺🇸 898 88 7ms 19 Nov 2025 374th JayXon 🇺🇸 898 110 24ms 13 Sep 2023 375th m-tkach 🇺🇦 898 114 2ms 8 Mar 2023 375th UnderKoen 🇳🇱 898 114 2ms 7 Oct 2024 377th sisyphus-ppcg 🇦🇺 897 61 5ms 15 Nov 2022 378th MeWhenI 🇻🇦 897 77 146ms 4 Jan 2022 379th MeWhenI 🇻🇦 897 82 4ms 26 Mar 2024 380th Yewzir 🇧🇪 897 92 416ms 30 Dec 2023 381st Lydxn 🇨🇦 896 76 3ms 17 Jul 2023 382nd Bubbler-4 896 84 121ms 17 Jan 2019 382nd primo-ppcg 🇹🇭 896 84 134ms 19 Oct 2020 382nd xnor-gate 896 84 138ms 3 Jan 2022 385th Steffan153 🇫🇮 895 70 415ms 20 Jan 2024 385th albanian-laundromat 895 70 407ms 16 Dec 2025 385th kg583 🇺🇸 895 70 369ms 4 days ago 388th Natanaelel 🇸🇪 893 28 2ms 7 Jan 2024 389th MeWhenI 🇻🇦 893 80 1,021ms 10 Nov 2021 390th Lydxn 🇨🇦 893 91 38ms 4 Jan 2022 391st 2bular 892 32 33ms 4 Nov 2025 392nd JayXon 🇺🇸 892 67 293ms 6 Jul 2021 393rd DialFrost 🇸🇬 892 121 310ms 26 Dec 2024 394th GrayJoKing 🇦🇺 891 73 4ms 16 Aug 2023 394th Lydxn 🇨🇦 891 73 4ms 28 Aug 2023 394th edsrzf 🇳🇿 891 73 4ms 30 Nov 2025 397th primo-ppcg 🇹🇭 891 85 137ms 6 Jul 2021 397th JayXon 🇺🇸 891 85 94ms 6 Jul 2021 399th sisyphus-ppcg 🇦🇺 891 115 1ms 7 Jul 2022 399th edsrzf 🇳🇿 891 115 2ms 5 Mar 2025 First Prev 321–400 of 3,207 Next Last