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 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 801st elisherer 🇮🇱 598 80 12ms 5 Apr 2019 802nd targrik 598 82 5ms 27 Nov 2025 803rd janAkali 🇷🇺 596 121 126ms 17 May 2025 804th MeWhenI 🇻🇦 595 68 3ms 15 Feb 2025 805th knutae 🇳🇴 595 94 9ms 4 Dec 2021 805th hellwue 595 94 10ms 29 Aug 2024 805th wh3n3v3r 🇨🇿 595 94 10ms 13 Nov 2024 805th solisolu 595 94 11ms 4 Jan 2026 809th LHLaurini 🇧🇷 594 94 1ms 2 May 2024 809th iczelia 🇩🇪 594 94 2ms 15 Oct 2025 811th MeWhenI 🇻🇦 594 171 1,722ms 22 Apr 2024 812th lynn 593 54 1,020ms 25 Jul 2021 813th DialFrost 🇸🇬 593 74 1,021ms 2 Sep 2025 814th emgordon154 592 96 154ms 5 Jan 2025 815th DialFrost 🇸🇬 592 150 26ms 6 Jan 2023 816th DaCuteRaccoon 589 82 33ms 27 Apr 2022 816th aksyristos 589 82 35ms 31 Jan 2023 818th sambirnbaum1 589 95 10ms 12 Oct 2019 818th tooningelaere 589 95 9ms 4 Dec 2022 818th andre-lameirinhas 🇵🇹 589 95 9ms 23 May 2023 818th vhoulbreque 🇫🇷 589 95 9ms 29 Nov 2025 822nd scpchicken 🇵🇼 587 117 114ms 3 Mar 2022 823rd Shanethegamer 🇺🇸 586 76 104ms 14 Dec 2022 824th Shanethegamer 🇺🇸 585 110 367ms 26 Mar 2022 825th ETHproductions 🇺🇸 584 82 11ms 25 Jul 2018 825th madex 🇩🇪 584 82 10ms 3 Aug 2021 825th fitzdotlol 🇺🇸 584 82 10ms 21 Mar 2022 825th trinityy-7 584 82 10ms 8 Oct 2024 829th Yewzir 🇧🇪 584 93 1ms 8 Apr 2024 830th KatieLG 🇬🇧 584 116 117ms 15 Jan 2023 831st ieeemma 583 96 10ms 1 Feb 2020 831st OllieBoyne 🇬🇧 583 96 12ms 29 Jan 2021 831st Mikey-Beep 🇬🇧 583 96 10ms 2 Jun 2024 834th olleicua 🇺🇸 582 83 35ms 15 Feb 2024 835th retrohun 582 96 1ms 9 Mar 2019 835th djeedjay 🇳🇱 582 96 1ms 29 Oct 2020 837th cbrt-x 582 118 115ms 11 Oct 2023 838th Yewzir 🇧🇪 582 122 445ms 29 Mar 2024 839th dokutan 581 213 25ms 6 days ago 840th scpchicken 🇵🇼 579 77 121ms 13 Mar 2022 841st user189032 577 83 9ms 29 May 2019 842nd RussellEmerine 577 119 117ms 9 Apr 2020 842nd guliyevemil1 🇦🇿 577 119 124ms 20 Apr 2020 844th Shanethegamer 🇺🇸 577 121 42ms 28 Sep 2024 845th skps2010 576 97 10ms 15 Jun 2019 845th martinnorling 🇸🇪 576 97 9ms 31 Mar 2022 845th rollershutter 576 97 12ms 30 Jun 2024 845th hiichbindermax 576 97 13ms 17 Sep 2024 845th ToE42 576 97 10ms 28 May 2025 850th TheZwierzLF 🇵🇱 575 93 497ms 16 Dec 2025 851st DialFrost 🇸🇬 573 84 283ms 14 Jun 2024 852nd MeWhenI 🇻🇦 573 122 44ms 13 Feb 2025 853rd HumanoidCPU 573 126 125ms 12 Nov 2025 854th Shanethegamer 🇺🇸 572 95 1ms 31 Oct 2022 854th alphafalfa 572 95 1ms 1 Aug 2025 856th rak1507 🇬🇧 572 120 121ms 29 Jun 2021 857th Indivicivet 571 98 11ms 17 Mar 2021 857th Bonjour27891 🇻🇳 571 98 10ms 6 Mar 2022 857th nullie 571 98 10ms 15 Jun 2022 857th johndixon01 571 98 9ms 22 Sep 2022 857th QuincyNash 🇺🇸 571 98 11ms 30 Nov 2022 857th ridingqwerty 🇺🇸 571 98 10ms 19 Dec 2023 857th theadamabrams 571 98 10ms 28 Nov 2024 857th TheZwierzLF 🇵🇱 571 98 9ms 23 Nov 2025 865th UnderKoen 🇳🇱 571 197 1ms 8 Mar 2023 866th arctouch-cristiannevianna 570 113 375ms 24 Nov 2023 867th MeWhenI 🇻🇦 568 91 8ms 16 Aug 2024 868th Yewzir 🇧🇪 567 88 1ms 15 Oct 2023 869th anastos 567 121 116ms 23 Jul 2018 870th wadefletch 565 99 9ms 8 Feb 2020 870th AkashTandon167 565 99 11ms 3 Jan 2021 870th kirbyyourmom 🇬🇧 565 99 9ms 4 Mar 2021 870th jtaxen 565 99 9ms 5 Apr 2024 870th dokutan 565 99 9ms 15 May 2024 875th janlelis 563 85 10ms 9 Feb 2021 875th Shanethegamer 🇺🇸 563 85 9ms 16 Jul 2021 877th mossprescott 563 122 108ms 13 Aug 2018 877th janbehrens 🇩🇪 563 122 114ms 17 Jun 2021 879th JRaspass 🇬🇧 562 76 3ms 28 Mar 2022 880th emgordon154 561 181 1,666ms 3 Jun 2025 First Prev 801–880 of 2,101 Next Last
