The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Pernicious Numbers (Long) 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 881st Florian-Mt 692 99 129ms 12 Jul 2024 882nd tatzyr 🇯🇵 691 57 53ms 26 Mar 2025 883rd voytxt 🇨🇿 691 64 14ms 21 Jul 2023 884th JunkIce 691 66 398ms 3 Dec 2024 885th Steffan153 🇫🇮 691 74 10ms 11 Feb 2026 886th mbittner20 690 72 17ms 27 May 2023 886th eiburns 690 72 19ms 27 Oct 2023 886th wh3n3v3r 🇨🇿 690 72 28ms 13 Nov 2024 886th WillowWispy 690 72 17ms 14 Mar 2025 890th MeWhenI 🇻🇦 689 92 382ms 19 Jun 2025 891st inventshah 685 64 152ms 4 Aug 2024 892nd prplz 🇦🇺 685 113 31ms 31 Dec 2022 893rd steffan-polygolf 684 77 81ms 24 Feb 2023 894th Codsilla 🇨🇦 682 61 291ms 3 Nov 2023 894th Daniel-Ellison 682 61 372ms 11 Feb 2026 896th Yewzir 🇧🇪 681 73 40ms 24 Feb 2024 897th weliveinhell 🇭🇹 680 65 16ms 15 Sep 2023 897th dylanarmstrong 680 65 13ms 25 Jan 2024 897th Yewzir 🇧🇪 680 65 21ms 12 Feb 2024 900th HumanoidCPU 680 67 464ms 19 Feb 2025 901st Yewzir 🇧🇪 680 69 7ms 13 Feb 2024 902nd msbranicky 680 76 2,565ms 6 Jan 2025 903rd snoozingnewt 🇨🇦 679 52 5ms 9 Oct 2025 904th 4hg 🇺🇸 679 58 56ms 11 Dec 2022 904th csharpython 679 58 50ms 5 Aug 2025 904th gmacdougall 679 58 53ms 25 Jan 2026 907th MeWhenI 🇻🇦 679 77 152ms 9 Apr 2024 908th MeWhenI 🇻🇦 679 78 4ms 9 Apr 2024 909th AlephSquirrel 678 97 6ms 5 Aug 2024 910th angel-p57 🇯🇵 678 215 291ms 11 Dec 2023 911th MeWhenI 🇻🇦 678 245 442ms 19 Apr 2025 912th kevinnaviapaiva 677 78 24ms 2 Feb 2026 913th retrohun 676 42 181ms 30 Dec 2022 913th neel11235813 676 42 173ms 3 Feb 2023 915th MeWhenI 🇻🇦 676 100 478ms 9 Apr 2024 916th emgordon154 675 87 35ms 19 Mar 2025 917th CaedenHarper 🇨🇦 675 128 273ms 5 Oct 2025 918th annaproxy 674 94 409ms 22 Oct 2023 919th gjoacorp 🇬🇧 672 109 61ms 4 Aug 2025 920th Anthony-Williams-06 671 74 18ms 12 Sep 2024 921st janbehrens 🇩🇪 671 79 4ms 20 Nov 2022 921st weliveinhell 🇭🇹 671 79 4ms 21 May 2024 923rd helbling 🇨🇭 670 66 14ms 5 Apr 2024 923rd snoozingnewt 🇨🇦 670 66 17ms 30 Dec 2025 925th kkoenig 670 129 280ms 2 Jan 2024 925th dokutan 670 129 287ms 10 Mar 2025 927th Steffan153 🇫🇮 668 71 5ms 20 Nov 2022 928th ejini6969 667 59 59ms 14 Jun 2025 929th MeWhenI 🇻🇦 666 79 96ms 7 Aug 2023 930th namcartoon06 666 110 63ms 15 Jul 2023 931st dokutan 664 66 144ms 7 Aug 2024 932nd snoozingnewt 🇨🇦 663 102 464ms 9 Oct 2025 933rd CedricGebistorf 662 75 25ms 4 May 2023 933rd namelessiw 662 75 26ms 11 Jan 2024 933rd robin-scragg 662 75 26ms 25 Jun 2025 936th Yewzir 🇧🇪 662 80 4ms 12 Feb 2024 936th dokutan 662 80 4ms 23 Mar 2024 938th MeWhenI 🇻🇦 662 171 1,690ms 7 Nov 2025 939th SirBogman 🇺🇸 661 51 1,187ms 22 Nov 2022 939th janbehrens 🇩🇪 661 51 1,216ms 27 Nov 2022 941st dokutan 661 70 8ms 19 Nov 2025 942nd snoozingnewt 🇨🇦 661 71 7ms 9 Oct 2025 943rd Steffan153 🇫🇮 661 251 53ms 2 Aug 2023 944th JRaspass 🇬🇧 660 43 153ms 19 Nov 2022 944th SirBogman 🇺🇸 660 43 160ms 20 Nov 2022 946th fuzzylojik-golf 🇺🇸 660 67 43ms 9 Jul 2025 946th JOrE20 660 67 53ms 5 Feb 2026 948th msbranicky 658 80 84ms 10 Sep 2023 949th dokutan 656 103 83ms 23 Feb 2026 950th SirBogman 🇺🇸 656 253 79ms 22 Nov 2022 951st albanian-laundromat 655 192 1,485ms 20 Oct 2025 952nd jacksonhenry3 654 76 24ms 2 Dec 2022 952nd Irratix 🇳🇱 654 76 24ms 31 Jan 2023 952nd NoahBolohan 🇨🇦 654 76 26ms 8 Feb 2023 952nd Andrey2001 654 76 25ms 9 Dec 2025 952nd Pyroan 654 76 25ms 22 Jan 2026 957th aksyristos 654 112 62ms 23 Jan 2023 958th MeWhenI 🇻🇦 654 121 15ms 9 Apr 2024 959th MeWhenI 🇻🇦 652 71 8ms 10 Oct 2023 960th stefangimmillaro 652 86 118ms 20 Nov 2022 First Prev 881–960 of 1,867 Next Last