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 801st Yewzir 🇧🇪 593 120 451ms 19 Nov 2023 801st qwertyuiop3 🇷🇺 593 120 445ms 28 May 2025 803rd GolfingSuccess 🇬🇷 592 91 1ms 21 Dec 2023 803rd Yewzir 🇧🇪 592 91 1ms 9 Feb 2024 805th SuperFola 591 203 77ms 8 days ago 806th janAkali 🇷🇺 590 119 126ms 17 May 2025 807th MeWhenI 🇻🇦 589 169 1,722ms 22 Apr 2024 808th elisherer 🇮🇱 588 78 12ms 5 Apr 2019 809th eddvrs 588 90 10ms 21 Dec 2023 809th coldham10 588 90 10ms 28 Jun 2025 811th targrik 587 80 5ms 27 Nov 2025 812th n1LS 586 76 36ms 9 Oct 2019 813th DialFrost 🇸🇬 586 148 26ms 6 Jan 2023 814th LHLaurini 🇧🇷 585 92 1ms 2 May 2024 814th iczelia 🇩🇪 585 92 2ms 15 Oct 2025 816th DialFrost 🇸🇬 582 72 1,021ms 2 Sep 2025 817th sambirnbaum1 582 91 10ms 12 Oct 2019 818th UnderKoen 🇳🇱 582 190 1ms 8 Mar 2023 819th SirFireball3521 580 61 154ms 2 Mar 2023 820th dokutan 580 207 22ms 7 days ago 821st scpchicken 🇵🇼 579 115 114ms 3 Mar 2022 822nd dokutan 578 107 74ms 23 Jan 2026 823rd Shanethegamer 🇺🇸 578 108 367ms 26 Mar 2022 824th lynn 577 52 1,020ms 25 Jul 2021 825th knutae 🇳🇴 576 92 9ms 4 Dec 2021 825th hellwue 576 92 10ms 29 Aug 2024 825th solisolu 576 92 11ms 4 Jan 2026 828th Yewzir 🇧🇪 575 91 1ms 8 Apr 2024 828th emgordon154 575 91 134ms 24 Sep 2024 830th Yewzir 🇧🇪 575 120 445ms 29 Mar 2024 831st cbrt-x 574 116 115ms 11 Oct 2023 832nd ETHproductions 🇺🇸 573 80 11ms 25 Jul 2018 832nd madex 🇩🇪 573 80 10ms 3 Aug 2021 832nd fitzdotlol 🇺🇸 573 80 10ms 21 Mar 2022 832nd trinityy-7 573 80 10ms 8 Oct 2024 836th retrohun 573 94 1ms 9 Mar 2019 836th djeedjay 🇳🇱 573 94 1ms 29 Oct 2020 838th MeWhenI 🇻🇦 573 120 3ms 2 Oct 2022 839th arctouch-cristiannevianna 572 109 375ms 24 Nov 2023 840th MeWhenI 🇻🇦 571 87 8ms 16 Aug 2024 841st KatieLG 🇬🇧 570 114 117ms 15 Jan 2023 842nd RussellEmerine 570 117 117ms 9 Apr 2020 842nd guliyevemil1 🇦🇿 570 117 124ms 20 Apr 2020 844th Shanethegamer 🇺🇸 570 119 42ms 28 Sep 2024 845th skps2010 569 93 10ms 15 Jun 2019 845th tooningelaere 569 93 9ms 4 Dec 2022 845th andre-lameirinhas 🇵🇹 569 93 9ms 23 May 2023 845th vhoulbreque 🇫🇷 569 93 9ms 29 Nov 2025 849th user189032 566 81 9ms 29 May 2019 850th MeWhenI 🇻🇦 566 120 44ms 13 Feb 2025 851st HumanoidCPU 566 124 125ms 12 Nov 2025 852nd rak1507 🇬🇧 565 118 121ms 29 Jun 2021 853rd dokutan 564 196 1ms 15 Oct 2024 854th DialFrost 🇸🇬 563 82 283ms 14 Jun 2024 855th Shanethegamer 🇺🇸 563 93 1ms 31 Oct 2022 855th alphafalfa 563 93 1ms 1 Aug 2025 857th ieeemma 563 94 10ms 1 Feb 2020 857th OllieBoyne 🇬🇧 563 94 12ms 29 Jan 2021 857th Mikey-Beep 🇬🇧 563 94 10ms 2 Jun 2024 860th jmerle 🇳🇱 561 275 7ms 4 Jul 2023 861st anastos 560 119 116ms 23 Jul 2018 862nd martinnorling 🇸🇪 558 95 9ms 31 Mar 2022 862nd rollershutter 558 95 12ms 30 Jun 2024 862nd hiichbindermax 558 95 13ms 17 Sep 2024 862nd ToE42 558 95 10ms 28 May 2025 866th Yewzir 🇧🇪 557 86 1ms 15 Oct 2023 867th dokutan 557 126 718ms 10 Dec 2025 868th DaCuteRaccoon 556 80 33ms 27 Apr 2022 868th aksyristos 556 80 35ms 31 Jan 2023 870th emgordon154 556 179 1,666ms 3 Jun 2025 871st mossprescott 555 120 108ms 13 Aug 2018 871st janbehrens 🇩🇪 555 120 114ms 17 Jun 2021 873rd TheZwierzLF 🇵🇱 554 88 465ms 23 Nov 2025 874th janlelis 553 83 10ms 9 Feb 2021 874th Shanethegamer 🇺🇸 553 83 9ms 16 Jul 2021 876th Indivicivet 552 96 11ms 17 Mar 2021 876th Bonjour27891 🇻🇳 552 96 10ms 6 Mar 2022 876th nullie 552 96 10ms 15 Jun 2022 876th johndixon01 552 96 9ms 22 Sep 2022 876th ridingqwerty 🇺🇸 552 96 10ms 19 Dec 2023 First Prev 801–880 of 2,084 Next Last