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 876th theadamabrams 552 96 10ms 28 Nov 2024 876th TheZwierzLF 🇵🇱 552 96 9ms 23 Nov 2025 883rd Yewzir 🇧🇪 551 120 36ms 29 Mar 2024 884th olleicua 🇺🇸 550 81 35ms 15 Feb 2024 885th Shanethegamer 🇺🇸 550 228 1,443ms 24 Apr 2025 886th dokutan 549 281 6ms 12 Jan 2024 887th janbehrens 🇩🇪 548 128 125ms 17 Jun 2021 888th revlayle 🇺🇸 547 114 366ms 10 Dec 2022 889th DialFrost 🇸🇬 547 126 583ms 8 Jun 2024 890th JOrE20 546 84 10ms 4 Jan 2026 891st wadefletch 546 97 9ms 8 Feb 2020 891st Psirving 546 97 9ms 1 Aug 2020 891st AkashTandon167 546 97 11ms 3 Jan 2021 891st kirbyyourmom 🇬🇧 546 97 9ms 4 Mar 2021 891st vezzick 546 97 10ms 12 Mar 2021 891st jtaxen 546 97 9ms 5 Apr 2024 897th albanian-laundromat 545 98 6ms 16 Nov 2025 898th KatieLG 🇬🇧 545 203 2ms 17 May 2025 899th MeWhenI 🇻🇦 544 111 40ms 11 Jun 2023 900th dokutan 543 131 61ms 21 Jun 2025 901st olligobber 🇦🇺 542 123 115ms 18 May 2020 902nd emgordon154 542 204 2ms 23 May 2025 903rd DialFrost 🇸🇬 540 87 4ms 28 Nov 2023 904th max-the-mage 540 98 9ms 29 Oct 2020 904th celiendonze 🇨🇭 540 98 10ms 26 Jun 2023 904th cingulataluke 540 98 10ms 26 Aug 2023 904th weliveinhell 🇭🇹 540 98 10ms 2 Oct 2024 904th 5quiwyrm 540 98 9ms 11 Feb 2025 909th qwertyuiop3 🇷🇺 539 100 1ms 27 May 2025 910th Mandrzejy 🇵🇱 539 132 437ms 25 Mar 2024 911th Mabeloid 🇳🇴 538 117 1ms 22 Sep 2024 912th janbehrens 🇩🇪 538 129 426ms 28 Nov 2023 913th Yewzir 🇧🇪 537 78 937ms 16 Nov 2025 914th bstrautin 537 86 256ms 10 Jun 2020 915th tobeannouncd 537 124 116ms 12 Jan 2024 916th ETHproductions 🇺🇸 536 79 250ms 22 Dec 2018 917th quimey 535 99 10ms 5 Jul 2023 917th Techdude01 535 99 9ms 21 Dec 2023 917th croc54 535 99 9ms 13 Dec 2024 917th firegene 🇮🇪 535 99 11ms 13 Feb 2026 921st DialFrost 🇸🇬 534 100 2ms 5 Nov 2023 921st HumanoidCPU 534 100 2ms 2 Jun 2024 923rd Shanethegamer 🇺🇸 533 68 3ms 13 Dec 2022 923rd DialFrost 🇸🇬 533 68 2ms 1 Feb 2025 925th varhammer 533 138 5ms 3 Jan 2022 926th albanian-laundromat 530 79 1,165ms 26 Sep 2025 927th abailey2020 🇺🇸 530 100 9ms 13 Dec 2020 927th mosho-p 530 100 2,553ms 13 Oct 2022 927th za3k 530 100 9ms 16 Oct 2022 927th maxgodfrey2004 🇨🇦 530 100 10ms 14 Feb 2025 931st Natanaelel 🇸🇪 528 67 109ms 8 Oct 2021 932nd Shanethegamer 🇺🇸 528 89 4ms 26 Oct 2022 933rd c0d3-4-F00d 🇩🇪 528 102 2ms 11 Nov 2021 934th bricknellj 528 218 2ms 30 Nov 2022 935th xyangst 527 87 9ms 18 Oct 2024 935th emgordon154 527 87 9ms 3 Jun 2025 937th CaedenHarper 🇨🇦 526 62 40ms 10 days ago 938th Natanaelel 🇸🇪 525 119 3ms 10 Jul 2023 939th countlpaul-dotcom 524 101 9ms 19 Oct 2025 940th rambox11 521 88 12ms 17 Jun 2018 940th frobinsonj 521 88 11ms 28 Jun 2018 942nd jacobly0 🇺🇸 521 191 1,761ms 22 Apr 2024 943rd KatieLG 🇬🇧 519 85 1,438ms 30 Apr 2021 944th karhuthebear 519 102 9ms 6 May 2022 944th Just4FunCoder 519 102 10ms 27 Nov 2022 944th SirFireball3521 519 102 10ms 2 Mar 2023 944th inverseLorentz 🇦🇺 519 102 10ms 23 Apr 2024 948th MeWhenI 🇻🇦 519 144 132ms 22 Apr 2024 949th violeta-desantis 518 104 1ms 14 Feb 2024 950th MeWhenI 🇻🇦 517 58 2ms 19 Jan 2022 951st HumanoidCPU 517 111 2,562ms 24 Oct 2024 952nd cywong-amino 🇭🇰 516 91 5ms 23 May 2020 953rd coreynash 515 89 9ms 6 Nov 2022 953rd targrik 515 89 10ms 24 Jul 2025 955th tomh1012 515 121 377ms 5 Jan 2026 956th zuparnowa 514 103 9ms 31 Jan 2019 956th henrytranter 514 103 10ms 20 Sep 2019 956th doug-h 514 103 10ms 26 May 2020 956th 77Tigers 514 103 10ms 4 Feb 2021 956th tpasfieldERAU 514 103 9ms 4 Nov 2022 First Prev 881–960 of 2,084 Next Last