The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Lucky Numbers 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 480th Shanethegamer 🇺🇸 709 68 452ms 6 Sep 2024 482nd inventshah 709 96 4ms 1 May 2025 483rd lifthrasiir 🇰🇷 708 39 3ms 29 Nov 2024 484th OhmNomNom 708 63 76ms 1 Nov 2022 485th didion0 🇺🇸 706 81 33ms 1 Mar 2022 485th jbt 706 81 309ms 28 Dec 2023 487th CaedenHarper 🇨🇦 706 106 85ms 27 Jan 2025 487th snoozingnewt 🇨🇦 706 106 91ms 5 Oct 2025 489th MeWhenI 🇻🇦 705 114 40ms 20 Jun 2022 490th MeWhenI 🇻🇦 705 211 1,895ms 7 Nov 2025 491st bob-th 702 72 12ms 2 Aug 2024 492nd Shanethegamer 🇺🇸 702 95 29ms 29 Apr 2025 493rd JohandeRuiter 🇳🇱 702 97 15ms 12 Nov 2023 494th stefangimmillaro 701 114 485ms 11 Aug 2023 495th Shanethegamer 🇺🇸 699 95 151ms 8 Jun 2022 496th Natanaelel 🇸🇪 697 64 43ms 1 Mar 2022 497th helbling 🇨🇭 697 82 38ms 13 Jun 2024 498th Shanethegamer 🇺🇸 695 96 158ms 7 Jun 2022 499th blaztoma 🇱🇹 694 36 61ms 22 Nov 2025 500th NewDefectus 🇮🇱 693 73 57ms 29 Apr 2022 500th AlephSquirrel 693 73 11ms 28 Jan 2023 500th fourth-bit 693 73 12ms 11 Jul 2023 500th neihousaigaai 693 73 33ms 22 Oct 2024 500th csharpython 693 73 105ms 18 Jul 2025 505th SirBogman 🇺🇸 693 108 117ms 23 Nov 2022 506th scpchicken 🇵🇼 692 55 63ms 18 Jan 2023 507th MeWhenI 🇻🇦 690 132 159ms 22 Jul 2024 508th akshatj27 🇦🇶 689 83 25ms 2 Mar 2022 508th AlephSquirrel 689 83 15ms 15 Feb 2023 510th edsrzf 🇳🇿 688 97 46ms 3 hours ago 511th emgordon154 688 230 1,735ms 9 Jun 2025 512th anter69 🇭🇺 686 65 81ms 12 Feb 2024 513th minhtrancccp 683 74 11ms 11 Jan 2024 513th albanian-laundromat 683 74 4,052ms 29 Apr 2025 515th janbehrens 🇩🇪 683 127 68ms 22 Dec 2023 516th Shanethegamer 🇺🇸 682 72 363ms 1 Mar 2022 517th DialFrost 🇸🇬 682 112 1,346ms 10 May 2025 518th DialFrost 🇸🇬 682 124 57ms 6 Dec 2024 519th neel11235813 681 48 34ms 18 Feb 2023 520th janbehrens 🇩🇪 681 84 28ms 1 Mar 2022 520th tayloia 🇬🇧 681 84 20ms 9 May 2023 520th lukegustafson 🇺🇸 681 84 105ms 15 Sep 2024 523rd stefangimmillaro 681 108 2,571ms 10 Nov 2024 524th stefangimmillaro 681 110 41ms 4 Nov 2022 525th MeWhenI 🇻🇦 680 82 80ms 11 Oct 2023 526th stefangimmillaro 680 134 136ms 26 Oct 2023 526th mousetail 🇳🇱 680 134 158ms 26 Sep 2025 528th error256 678 92 1,213ms 13 Aug 2025 529th DialFrost 🇸🇬 677 91 117ms 2 May 2025 530th Yax42 🇫🇷 677 118 527ms 27 Apr 2025 531st DaCuteRaccoon 677 125 58ms 1 Dec 2022 531st CaedenHarper 🇨🇦 677 125 57ms 27 Jan 2025 533rd Irratix 🇳🇱 676 66 80ms 9 Mar 2022 534th suwat513 674 75 11ms 20 Sep 2022 534th ahmetdemirag 🇨🇾 674 75 10ms 6 Mar 2025 536th KrausRaus 🇺🇸 673 85 24ms 2 Mar 2022 537th c0d3-4-F00d 🇩🇪 672 126 57ms 5 Mar 2022 537th snoozingnewt 🇨🇦 672 126 57ms 1 Sep 2024 539th MeWhenI 🇻🇦 670 92 101ms 24 Feb 2023 540th tuffnatty 🇩🇪 670 99 142ms 19 Jul 2023 541st Shanethegamer 🇺🇸 669 83 1,223ms 7 Jun 2022 542nd c0d3-4-F00d 🇩🇪 668 102 8ms 5 Mar 2022 542nd janbehrens 🇩🇪 668 102 8ms 16 May 2023 542nd CaedenHarper 🇨🇦 668 102 9ms 27 Jan 2025 542nd iczelia 🇩🇪 668 102 8ms 17 Oct 2025 546th tailorspy 667 130 74ms 22 Aug 2024 547th CLOStrophobic 🇮🇹 666 127 2,710ms 4 Feb 2025 548th dillon-duncando 665 70 105ms 10 Mar 2024 549th Indivicivet 665 76 12ms 9 May 2022 549th nstearns96 🇬🇧 665 76 31ms 9 Jan 2023 549th TaserTheFox 🇺🇸 665 76 11ms 16 Feb 2023 549th cros107 🇦🇺 665 76 12ms 19 Aug 2023 549th cingulataluke 665 76 47ms 29 Aug 2023 549th stertooy 🇧🇪 665 76 11ms 15 Jun 2024 549th hiichbindermax 665 76 11ms 22 Jun 2024 549th wh3n3v3r 🇨🇿 665 76 25ms 12 Nov 2024 549th qpwoeirut 665 76 12ms 19 Sep 2025 558th BambooleanLogic 🇸🇪 665 86 41ms 15 Nov 2022 558th Maznek 665 86 33ms 11 Dec 2023 560th Lydxn 🇨🇦 663 137 435ms 5 Mar 2022 First Prev 481–560 of 1,576 Next Last