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?
Sierpiński Triangle in all languages in chars. 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 Chars Time Submitted 241st m-tkach 🇺🇦 871 56 3,455ms 21 Jan 2024 242nd MeWhenI 🇻🇦 870 76 38ms 17 Feb 2023 243rd Steffan153 🇫🇮 870 138 30ms 7 days ago 244th sean-niemann 🇺🇸 869 66 2,438ms 23 Oct 2024 245th Irratix 🇳🇱 868 61 18ms 23 May 2022 245th sisyphus-ppcg 🇦🇺 868 61 10ms 22 Jan 2023 245th duckyluuk 🇳🇱 868 61 10ms 15 Aug 2024 245th ZakkkkAttackkkk 🇵🇭 868 61 10ms 20 Feb 2025 245th Babafaba 868 61 10ms 6 Nov 2025 245th edsrzf 🇳🇿 868 61 11ms 7 days ago 251st MeWhenI 🇻🇦 868 72 4ms 23 May 2023 252nd lynn 867 100 24ms 17 Jul 2023 253rd emplv 🇱🇻 865 53 10ms 8 Mar 2023 254th AlexDaniel 🇪🇪 863 41 114ms 21 Feb 2018 255th thospel 863 42 3ms 2 Apr 2018 255th nwellnhof 🇩🇪 863 42 3ms 22 May 2022 255th sisyphus-ppcg 🇦🇺 863 42 3ms 22 Jan 2023 255th Lydxn 🇨🇦 863 42 3ms 5 Feb 2023 255th Steffan153 🇫🇮 863 42 3ms 21 Feb 2024 255th sean-niemann 🇺🇸 863 42 3ms 10 Mar 2025 255th saito-ta 🇯🇵 863 42 3ms 3 Aug 2025 262nd ovs-code 🇩🇪 861 179 7ms 31 Mar 2023 263rd primo-ppcg 🇹🇭 861 289 11ms 13 Aug 2025 264th Steffan153 🇫🇮 860 66 157ms 21 Feb 2024 265th primo-ppcg 🇹🇭 859 87 131ms 5 Jan 2020 266th GrayJoKing 🇦🇺 859 101 25ms 5 Apr 2023 267th lynn 857 35 36ms 1 Dec 2021 267th lynn 857 35 2ms 10 Jan 2022 269th emgordon154 857 58 3ms 6 Jun 2025 270th rucin93 🇵🇱 857 61 137ms 12 Dec 2024 271st emgordon154 856 57 400ms 10 Sep 2025 272nd edsrzf 🇳🇿 855 49 735ms 13 Feb 2026 273rd rhdqor213 855 63 123ms 27 Sep 2023 274th AdrienHache 🇫🇷 854 73 435ms 22 Sep 2025 275th steffan-polygolf 854 76 87ms 21 Feb 2024 276th primo-ppcg 🇹🇭 854 78 115ms 15 Feb 2019 277th m-tkach 🇺🇦 854 123 24ms 3 May 2022 278th MeWhenI 🇻🇦 851 74 1ms 31 Dec 2022 279th saito-ta 🇯🇵 850 65 10ms 12 Dec 2023 280th rucin93 🇵🇱 850 88 123ms 16 Jul 2024 281st Steffan153 🇫🇮 849 81 3ms 4 Jul 2024 282nd primo-ppcg 🇹🇭 847 114 293ms 13 May 2020 283rd MichalMarsalek 🇨🇿 845 83 126ms 12 Feb 2023 283rd steffan-polygolf 845 83 132ms 21 Feb 2024 285th ovs-code 🇩🇪 843 59 4ms 24 days ago 286th MeWhenI 🇻🇦 842 103 24ms 7 Jun 2023 287th prplz 🇦🇺 841 63 9ms 21 Oct 2019 287th Attero 🇸🇪 841 63 11ms 25 Sep 2020 287th KatieLG 🇬🇧 841 63 10ms 27 days ago 290th MeWhenI 🇻🇦 840 53 38ms 17 Nov 2022 290th stefangimmillaro 840 53 35ms 11 Jan 2023 290th Irratix 🇳🇱 840 53 33ms 19 Jan 2023 293rd SirBogman 🇺🇸 839 55 250ms 29 Jan 2024 294th edsrzf 🇳🇿 838 81 43ms 7 days ago 295th m-tkach 🇺🇦 838 132 2ms 29 Jan 2024 296th sean-niemann 🇺🇸 835 68 149ms 23 Jun 2025 297th marcin7Cd 835 88 5ms 4 Feb 2021 298th vlpx 🇫🇮 834 55 12ms 1 Aug 2024 298th p01 834 55 10ms 25 Jul 2025 300th KasperKivimaeki 🇫🇮 833 116 293ms 9 Oct 2025 301st jared-hughes 833 185 6ms 24 Jul 2023 302nd acotis 831 90 126ms 23 Apr 2025 303rd ovs-code 🇩🇪 830 51 238ms 9 May 2024 304th MeWhenI 🇻🇦 830 300 11ms 28 Aug 2023 305th jared-hughes 829 76 1ms 13 Nov 2022 306th inventshah 828 64 10ms 21 Jan 2023 306th commandz0 🇺🇸 828 64 10ms 22 Aug 2023 306th steffan-polygolf 828 64 10ms 8 Mar 2024 306th Yewzir 🇧🇪 828 64 10ms 5 Jun 2024 306th ryyyn 🇺🇸 828 64 10ms 18 Dec 2025 306th snoozingnewt 🇨🇦 828 64 10ms 13 Feb 2026 312th ovs-code 🇩🇪 827 59 444ms 16 Jan 2024 312th DialFrost 🇸🇬 827 59 468ms 16 Jan 2024 312th neel11235813 827 59 430ms 14 Mar 2024 315th primo-ppcg 🇹🇭 827 77 1,339ms 11 May 2020 316th CLOStrophobic 🇮🇹 826 89 10ms 4 Mar 2025 317th Kacarott 🇦🇺 825 85 62ms 9 Dec 2025 318th sisyphus-ppcg 🇦🇺 824 54 34ms 22 Jan 2023 318th ovs-code 🇩🇪 824 54 35ms 8 Jun 2024 318th anter69 🇭🇺 824 54 37ms 21 Oct 2024 First Prev 241–320 of 2,084 Next Last