The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 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 321st MeWhenI 🇻🇦 824 56 288ms 28 Jan 2023 322nd emplv 🇱🇻 824 57 7ms 2 Jul 2023 323rd GrayJoKing 🇦🇺 823 72 229ms 30 Oct 2023 324th GrayJoKing 🇦🇺 823 140 1ms 6 Dec 2020 325th stefangimmillaro 822 80 103ms 10 Jan 2026 326th andersk 🇺🇸 822 91 142ms 1 Nov 2022 327th kg583 🇺🇸 822 146 31ms 23 days ago 328th bendiscz 819 118 285ms 18 Apr 2020 329th GrayJoKing 🇦🇺 818 77 1ms 23 Jan 2023 330th MeWhenI 🇻🇦 817 54 1,230ms 12 May 2023 330th rucin93 🇵🇱 817 54 1,200ms 11 Jul 2024 330th pardouin 🇫🇷 817 54 1,577ms 11 Aug 2025 333rd somebody1234 817 90 7ms 19 May 2018 334th emplv 🇱🇻 816 66 2ms 31 May 2022 335th MeWhenI 🇻🇦 816 80 111ms 17 Nov 2022 336th ovs-code 🇩🇪 816 86 69ms 17 Sep 2023 337th edsrzf 🇳🇿 816 147 32ms 7 days ago 338th Natanaelel 🇸🇪 815 40 40ms 29 Aug 2022 339th antimon2 🇯🇵 814 52 260ms 12 Jul 2020 340th saito-ta 🇯🇵 814 60 2ms 31 May 2022 341st MeWhenI 🇻🇦 814 76 87ms 12 Dec 2022 342nd HPWiz 🇳🇿 813 82 114ms 20 Oct 2020 343rd GrayJoKing 🇦🇺 812 92 7ms 4 Feb 2025 344th nwellnhof 🇩🇪 811 37 34ms 1 Oct 2021 344th Dominoscompute 811 37 35ms 1 Jun 2022 346th hiddicop 🇸🇪 809 55 31ms 31 Jan 2021 346th olivermrose 🇺🇸 809 55 34ms 7 Oct 2021 346th DialFrost 🇸🇬 809 55 34ms 28 Nov 2023 346th blaztoma 🇱🇹 809 55 36ms 18 Dec 2025 350th inventshah 808 88 57ms 11 Dec 2025 351st cure-honey 🇯🇵 808 130 25ms 9 Jul 2021 351st JOrE20 808 130 27ms 15 Feb 2026 353rd xem 805 57 10ms 8 Oct 2018 354th emplv 🇱🇻 805 81 121ms 22 Jan 2023 354th Yewzir 🇧🇪 805 81 113ms 28 Mar 2024 356th emplv 🇱🇻 805 120 282ms 26 Jan 2022 357th lynn 804 93 122ms 10 Mar 2022 358th kg583 🇺🇸 803 91 9ms 30 Jul 2025 359th stefangimmillaro 802 55 1,469ms 10 Jan 2023 360th SnowballSH 802 66 10ms 4 Mar 2021 360th StefanHabel 🇨🇦 802 66 10ms 20 Apr 2024 360th Flekay 🇩🇪 802 66 10ms 26 days ago 363rd steffan-polygolf 801 78 3ms 21 Feb 2024 364th duckyluuk 🇳🇱 800 61 408ms 29 Aug 2024 364th Babafaba 800 61 379ms 6 Nov 2025 366th Yax42 🇫🇷 800 78 378ms 27 Jan 2026 367th GrayJoKing 🇦🇺 797 88 120ms 5 Apr 2023 368th rucin93 🇵🇱 796 72 2,428ms 20 Nov 2024 369th Shanethegamer 🇺🇸 796 109 24ms 2 Mar 2023 370th MeWhenI 🇻🇦 795 41 44ms 24 Aug 2022 371st MeWhenI 🇻🇦 795 94 7ms 1 Jan 2025 372nd GrayJoKing 🇦🇺 792 66 149ms 13 Aug 2024 373rd stefangimmillaro 792 122 286ms 26 Aug 2023 374th sisyphus-ppcg 🇦🇺 791 58 9ms 23 Jan 2023 375th leon-w 790 67 11ms 5 Jan 2019 375th GolfingSuccess 🇬🇷 790 67 17ms 10 Oct 2020 375th Shanethegamer 🇺🇸 790 67 10ms 26 Mar 2022 375th SirBogman 🇺🇸 790 67 10ms 4 Dec 2022 375th bzijlema 🇳🇱 790 67 10ms 15 Nov 2024 375th ndren 790 67 11ms 7 Jul 2025 381st BlankSpruce 790 90 64ms 12 Aug 2022 381st zygoloid 790 90 59ms 6 Aug 2024 381st snyderek 🇺🇸 790 90 62ms 6 Aug 2024 381st tailorspy 790 90 54ms 9 Aug 2024 385th primo-ppcg 🇹🇭 789 72 160ms 25 Dec 2020 386th o0lit3 🇺🇸 788 46 3ms 18 Sep 2020 386th GrayJoKing 🇦🇺 788 46 3ms 22 Jan 2023 386th scpchicken 🇵🇼 788 46 3ms 22 Jan 2023 389th m-tkach 🇺🇦 788 110 30ms 5 Jan 2024 390th anter69 🇭🇺 787 56 1,450ms 22 Feb 2024 391st Shanethegamer 🇺🇸 786 83 111ms 25 Oct 2022 392nd arjanadriaanse 🇳🇱 784 85 113ms 9 Feb 2022 393rd ovs-code 🇩🇪 784 88 489ms 8 Mar 2022 394th sisyphus-ppcg 🇦🇺 783 60 5ms 22 Jan 2023 395th Shanethegamer 🇺🇸 783 79 83ms 25 Oct 2022 396th cure-honey 🇯🇵 783 84 96ms 10 Jul 2021 397th emplv 🇱🇻 783 134 25ms 31 Oct 2022 398th janlelis 781 57 35ms 5 Jan 2020 398th prplz 🇦🇺 781 57 35ms 5 Jun 2020 398th KatieLG 🇬🇧 781 57 35ms 19 Oct 2021 First Prev 321–400 of 2,083 Next Last