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?
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 400th DialFrost 🇸🇬 768 64 365ms 17 Jan 2023 402nd CarsonChr 🇺🇸 766 66 11ms 24 Sep 2022 402nd jatloe 766 66 12ms 6 Sep 2024 404th ovs-code 🇩🇪 766 92 397ms 10 Mar 2023 405th JunkIce 765 63 396ms 3 Dec 2024 406th DialFrost 🇸🇬 764 73 43ms 29 Apr 2025 407th aksyristos 763 61 136ms 28 Feb 2023 408th Shanethegamer 🇺🇸 763 100 1,332ms 30 Dec 2022 409th DialFrost 🇸🇬 763 251 1,016ms 13 Aug 2025 410th MeWhenI 🇻🇦 762 91 17ms 22 Jul 2024 411th nwellnhof 🇩🇪 761 50 151ms 10 Mar 2023 412th DialFrost 🇸🇬 761 89 137ms 29 Apr 2025 413th GolfingSuccess 🇬🇷 758 33 108ms 22 Jul 2022 413th DialFrost 🇸🇬 758 33 64ms 30 Apr 2025 415th MeWhenI 🇻🇦 758 148 295ms 1 Mar 2022 415th arctouch-cristiannevianna 758 148 298ms 19 Oct 2023 417th KatieLG 🇬🇧 756 59 63ms 2 Oct 2025 418th ScottHamper 756 107 146ms 2 Mar 2022 419th za3k 755 67 11ms 12 Oct 2022 419th Just4FunCoder 755 67 11ms 26 Nov 2022 421st edsrzf 🇳🇿 755 119 51ms 11 hours ago 422nd Shanethegamer 🇺🇸 754 83 168ms 31 May 2022 423rd Shanethegamer 🇺🇸 754 92 18ms 7 Jun 2022 424th emgordon154 754 97 192ms 29 Jul 2025 425th Shanethegamer 🇺🇸 754 106 377ms 9 Apr 2025 426th jared-hughes 751 84 2,141ms 11 Sep 2023 426th alomiF 751 84 272ms 4 Dec 2023 428th MeWhenI 🇻🇦 749 108 473ms 22 May 2022 428th Shanethegamer 🇺🇸 749 108 464ms 7 Jun 2022 430th NewDefectus 🇮🇱 748 91 3ms 29 Apr 2022 430th Shanethegamer 🇺🇸 748 91 4ms 28 May 2025 432nd inventshah 748 116 66ms 1 May 2025 433rd Natanaelel 🇸🇪 746 37 499ms 22 Jul 2023 434th o0lit3 🇺🇸 746 51 37ms 19 Mar 2022 434th sean-niemann 🇺🇸 746 51 36ms 5 Apr 2022 434th Steffan153 🇫🇮 746 51 36ms 17 Feb 2023 437th ovs-code 🇩🇪 744 59 1,505ms 3 Jan 2024 438th Irratix 🇳🇱 744 68 100ms 23 Apr 2022 438th 2011-Chan-Ethan 744 68 59ms 20 Jul 2023 438th HumanoidCPU 744 68 54ms 27 May 2024 438th agreegious 744 68 120ms 16 Mar 2025 442nd Natanaelel 🇸🇪 742 44 39ms 11 Nov 2023 443rd marshallward 🇺🇸 741 101 89ms 8 Jul 2023 444th MeWhenI 🇻🇦 740 92 3ms 22 May 2022 445th MeWhenI 🇻🇦 735 92 50ms 10 Sep 2022 446th MeWhenI 🇻🇦 735 118 62ms 22 May 2022 447th stefangimmillaro 734 84 123ms 10 Jan 2023 448th YAJUE114514 734 86 277ms 30 Jul 2025 449th fuzzylojik-golf 🇺🇸 733 69 32ms 20 hours ago 450th UnderKoen 🇳🇱 733 216 620ms 7 Feb 2024 451st MeWhenI 🇻🇦 732 74 44ms 4 Nov 2022 452nd jared-hughes 731 61 59ms 9 Sep 2022 452nd emgordon154 731 61 113ms 13 Nov 2024 454th fuzzylojik-golf 🇺🇸 730 66 433ms 20 hours ago 455th Shanethegamer 🇺🇸 728 116 51ms 30 Dec 2022 456th Shanethegamer 🇺🇸 728 125 133ms 7 Jun 2022 457th SirBogman 🇺🇸 726 45 35ms 30 Aug 2022 458th Frowny 725 87 251ms 1 Mar 2022 458th annaproxy 725 87 225ms 2 Mar 2022 458th DaCuteRaccoon 725 87 341ms 1 Dec 2022 458th CaedenHarper 🇨🇦 725 87 338ms 27 Jan 2025 462nd ovs-code 🇩🇪 724 70 157ms 3 Aug 2024 463rd Irratix 🇳🇱 724 79 26ms 1 Mar 2022 464th Shanethegamer 🇺🇸 724 111 39ms 14 Jun 2022 465th thehylian 723 70 37ms 2 Jan 2023 465th JOrE20 723 70 12ms 16 Feb 2026 465th Lv0Sys 🇵🇱 723 70 11ms 27 Feb 2026 468th pardouin 🇫🇷 722 67 1,652ms 29 Jul 2025 469th Feniske 🇫🇷 720 70 3,346ms 3 Nov 2023 470th DialFrost 🇸🇬 720 74 1,193ms 29 Dec 2025 471st stefangimmillaro 719 156 295ms 22 Jun 2023 472nd edsrzf 🇳🇿 717 102 268ms 29 May 2025 473rd Lv0Sys 🇵🇱 715 80 43ms 27 Feb 2026 474th MeWhenI 🇻🇦 712 68 1,296ms 22 May 2022 475th Frowny 712 71 13ms 1 Mar 2022 475th Eilonlif 🇮🇱 712 71 120ms 12 Mar 2023 477th jared-hughes 710 75 1,407ms 17 Jul 2022 478th MeWhenI 🇻🇦 710 94 198ms 28 Feb 2025 479th HumanoidCPU 709 68 463ms 27 May 2024 479th Shanethegamer 🇺🇸 709 68 452ms 6 Sep 2024 First Prev 401–480 of 1,575 Next Last