The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 days. Why not try and solve them ahead of time?
Lucky Numbers in all languages in bytes. 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 Bytes Time Submitted 480th ahmetdemirag 🇨🇾 700 75 10ms 6 Mar 2025 480th plcc0 700 75 55ms 21 Mar 2025 480th RaBa21 🇭🇺 700 75 122ms 12 Jul 2025 484th Shanethegamer 🇺🇸 699 95 151ms 8 Jun 2022 485th Natanaelel 🇸🇪 697 64 43ms 1 Mar 2022 485th olivermrose 🇺🇸 697 64 60ms 1 Mar 2022 487th helbling 🇨🇭 697 82 38ms 13 Jun 2024 488th Shanethegamer 🇺🇸 695 96 158ms 7 Jun 2022 489th blaztoma 🇱🇹 694 36 61ms 22 Nov 2025 490th SirBogman 🇺🇸 693 108 117ms 23 Nov 2022 491st edsrzf 🇳🇿 691 130 52ms 27 Dec 2024 492nd Indivicivet 690 76 12ms 9 May 2022 492nd QuincyNash 🇺🇸 690 76 11ms 2 Dec 2022 492nd nstearns96 🇬🇧 690 76 31ms 9 Jan 2023 492nd TaserTheFox 🇺🇸 690 76 11ms 16 Feb 2023 492nd cros107 🇦🇺 690 76 12ms 19 Aug 2023 492nd stertooy 🇧🇪 690 76 11ms 15 Jun 2024 492nd hiichbindermax 690 76 11ms 22 Jun 2024 492nd JunkIce 690 76 11ms 24 Nov 2024 492nd csharpython 690 76 11ms 28 Aug 2025 492nd qpwoeirut 690 76 12ms 19 Sep 2025 492nd fuzzylojik-golf 🇺🇸 690 76 13ms 4 days ago 503rd MeWhenI 🇻🇦 690 132 159ms 22 Jul 2024 504th akshatj27 🇦🇶 689 83 25ms 2 Mar 2022 504th AlephSquirrel 689 83 15ms 15 Feb 2023 506th emgordon154 688 230 1,735ms 9 Jun 2025 507th AlephSquirrel 685 73 461ms 16 Jan 2024 508th janbehrens 🇩🇪 683 127 68ms 22 Dec 2023 509th Shanethegamer 🇺🇸 682 72 363ms 1 Mar 2022 510th DialFrost 🇸🇬 682 112 1,346ms 10 May 2025 511th DialFrost 🇸🇬 682 124 57ms 6 Dec 2024 512th DialFrost 🇸🇬 681 48 35ms 28 Jan 2023 512th neel11235813 681 48 34ms 18 Feb 2023 514th Anonymousellama21 681 77 11ms 15 Jun 2022 514th jakobkordez 🇸🇮 681 77 11ms 7 Nov 2022 514th betaveros 681 77 11ms 1 Jan 2023 514th quimey 681 77 11ms 15 Mar 2023 514th elgan65536 🇺🇸 681 77 12ms 30 Mar 2024 514th thienudomsrirungruang 681 77 35ms 7 May 2024 514th MeWhenI 🇻🇦 681 77 151ms 3 Aug 2024 514th 77Tigers 681 77 12ms 9 Jan 2026 522nd janbehrens 🇩🇪 681 84 28ms 1 Mar 2022 522nd tayloia 🇬🇧 681 84 20ms 9 May 2023 522nd lukegustafson 🇺🇸 681 84 105ms 15 Sep 2024 525th stefangimmillaro 681 108 2,571ms 10 Nov 2024 526th stefangimmillaro 681 110 41ms 4 Nov 2022 527th MeWhenI 🇻🇦 680 82 80ms 11 Oct 2023 528th stefangimmillaro 680 134 136ms 26 Oct 2023 528th mousetail 🇳🇱 680 134 158ms 26 Sep 2025 530th error256 678 92 1,213ms 13 Aug 2025 531st edsrzf 🇳🇿 678 105 163ms 29 May 2025 532nd DialFrost 🇸🇬 677 91 117ms 2 May 2025 533rd Yax42 🇫🇷 677 118 527ms 23 Dec 2025 534th DaCuteRaccoon 677 125 58ms 1 Dec 2022 534th CaedenHarper 🇨🇦 677 125 57ms 27 Jan 2025 536th Irratix 🇳🇱 676 66 80ms 9 Mar 2022 537th c0d3-4-F00d 🇩🇪 676 102 8ms 5 Mar 2022 537th janbehrens 🇩🇪 676 102 8ms 16 May 2023 537th CaedenHarper 🇨🇦 676 102 9ms 27 Jan 2025 537th iczelia 🇩🇪 676 102 8ms 17 Oct 2025 541st knutae 🇳🇴 673 78 11ms 9 Mar 2022 541st jhpaques 🇫🇷 673 78 12ms 29 Jul 2022 541st marcin7Cd 673 78 11ms 2 Sep 2022 541st hellwue 673 78 11ms 28 Apr 2023 541st davecame 673 78 11ms 7 Nov 2023 546th KrausRaus 🇺🇸 673 85 24ms 2 Mar 2022 547th c0d3-4-F00d 🇩🇪 672 126 57ms 5 Mar 2022 547th snoozingnewt 🇨🇦 672 126 57ms 1 Sep 2024 549th MeWhenI 🇻🇦 670 92 101ms 24 Feb 2023 550th tuffnatty 🇩🇪 670 99 142ms 19 Jul 2023 551st m-tkach 🇺🇦 670 103 12ms 30 Mar 2022 552nd Shanethegamer 🇺🇸 669 83 1,223ms 7 Jun 2022 553rd emgordon154 669 122 192ms 12 Dec 2024 554th fuzzylojik-golf 🇺🇸 667 75 423ms 3 days ago 555th tailorspy 667 130 74ms 22 Aug 2024 556th CLOStrophobic 🇮🇹 666 127 2,710ms 4 Feb 2025 557th dillon-duncando 665 70 105ms 10 Mar 2024 558th BambooleanLogic 🇸🇪 665 86 41ms 15 Nov 2022 558th Maznek 665 86 33ms 11 Dec 2023 560th Lydxn 🇨🇦 665 138 435ms 5 Mar 2022 First Prev 481–560 of 1,586 Next Last