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 321st janlelis 826 54 289ms 12 Sep 2024 321st pardouin 🇫🇷 826 54 64ms 9 Sep 2025 323rd DialFrost 🇸🇬 826 61 3,214ms 12 Nov 2025 324th sean-niemann 🇺🇸 826 84 11ms 23 Dec 2025 325th ovs-code 🇩🇪 825 98 462ms 2 Mar 2022 325th sean-niemann 🇺🇸 825 98 458ms 3 Dec 2025 327th Steffan153 🇫🇮 824 81 30ms 7 Aug 2023 328th ScottHamper 824 97 378ms 2 Mar 2022 328th nwellnhof 🇩🇪 824 97 372ms 24 May 2022 328th tomtheisen 🇺🇸 824 97 412ms 10 Apr 2025 331st edsrzf 🇳🇿 822 103 170ms 14 hours ago 332nd TFeld00 🇩🇰 820 64 11ms 4 Oct 2022 333rd m-tkach 🇺🇦 820 135 30ms 30 Mar 2022 333rd primo-ppcg 🇹🇭 820 135 28ms 10 May 2023 335th sean-niemann 🇺🇸 818 106 65ms 3 Dec 2025 336th Steffan153 🇫🇮 817 57 100ms 16 Dec 2022 336th Alessandro-Balconi 🇮🇹 817 57 84ms 7 Aug 2023 336th DialFrost 🇸🇬 817 57 153ms 30 Jul 2024 336th snoozingnewt 🇨🇦 817 57 132ms 17 Feb 2026 340th lyphyser 817 68 64ms 10 Feb 2024 341st jared-hughes 817 70 16ms 2 Mar 2022 341st ovs-code 🇩🇪 817 70 16ms 3 Aug 2024 343rd DialFrost 🇸🇬 817 90 2,511ms 30 Apr 2025 344th primo-ppcg 🇹🇭 815 56 835ms 3 Mar 2022 345th DialFrost 🇸🇬 815 98 498ms 22 Jul 2025 346th HPWiz 🇳🇿 812 34 28ms 1 Mar 2022 347th Shanethegamer 🇺🇸 812 113 486ms 25 Sep 2025 348th DialFrost 🇸🇬 811 107 65ms 27 Apr 2025 349th Steffan153 🇫🇮 809 78 283ms 17 Dec 2022 350th clockworknazo 808 67 31ms 11 Nov 2022 351st emgordon154 808 91 2,718ms 4 Jul 2025 352nd DialFrost 🇸🇬 807 65 152ms 28 Apr 2025 353rd tuffnatty 🇩🇪 807 80 13ms 19 Jul 2023 354th sean-niemann 🇺🇸 807 99 363ms 3 Dec 2025 355th AlephSquirrel 806 31 686ms 11 Feb 2023 355th plcc0 806 31 59ms 7 Apr 2025 355th CaedenHarper 🇨🇦 806 31 61ms 2 Dec 2025 358th AlephSquirrel 806 105 186ms 21 Oct 2024 359th Shanethegamer 🇺🇸 806 139 291ms 7 Feb 2024 360th itsh01 805 71 22ms 2 Mar 2022 361st DialFrost 🇸🇬 803 69 1,287ms 31 Aug 2025 362nd Alex-x90 🇺🇸 803 108 62ms 3 Oct 2023 362nd jared-hughes 803 108 65ms 22 Dec 2023 364th jared-hughes 802 86 3ms 22 Dec 2023 365th Natanaelel 🇸🇪 801 57 477ms 11 Nov 2023 366th DialFrost 🇸🇬 801 101 460ms 27 Apr 2025 367th edsrzf 🇳🇿 800 102 268ms 29 May 2025 368th SirBogman 🇺🇸 797 56 41ms 20 May 2022 368th stefangimmillaro 797 56 58ms 22 May 2022 370th sean-niemann 🇺🇸 796 68 27ms 7 Jan 2026 371st jatloe 795 66 12ms 6 Sep 2024 372nd MeWhenI 🇻🇦 794 72 13ms 1 Mar 2022 373rd DialFrost 🇸🇬 794 84 168ms 26 May 2025 374th xsot 🇸🇬 792 70 2,820ms 14 Nov 2025 375th MeWhenI 🇻🇦 791 101 502ms 20 Nov 2025 376th copy 789 35 239ms 13 Mar 2025 377th Steffan153 🇫🇮 789 107 44ms 12 Mar 2023 378th SirBogman 🇺🇸 787 58 403ms 11 May 2022 379th stefangimmillaro 784 117 433ms 6 Oct 2025 380th za3k 783 67 11ms 12 Oct 2022 381st Shanethegamer 🇺🇸 783 73 13ms 7 Jun 2022 382nd namelessiw 783 102 347ms 23 Jul 2025 382nd AdrienHache 🇫🇷 783 102 455ms 23 Dec 2025 384th emgordon154 781 32 68ms 21 Oct 2025 385th MichalMarsalek 🇨🇿 781 85 148ms 1 Mar 2022 386th annaproxy 781 97 230ms 1 Apr 2022 387th typeswitch-dev 🇵🇹 778 83 14ms 17 Aug 2023 388th GrayJoKing 🇦🇺 775 65 2,399ms 13 Mar 2023 389th Alex-x90 🇺🇸 775 89 3ms 3 Oct 2023 390th Shanethegamer 🇺🇸 774 112 65ms 31 Jan 2023 391st stefangimmillaro 773 74 18ms 28 Aug 2022 392nd MeWhenI 🇻🇦 772 74 378ms 15 Aug 2024 393rd DialFrost 🇸🇬 772 86 133ms 29 Apr 2025 394th sean-niemann 🇺🇸 771 72 1,245ms 7 Jan 2026 395th Shanethegamer 🇺🇸 769 82 278ms 31 Jan 2023 395th scpchicken 🇵🇼 769 82 285ms 11 Mar 2023 395th yzhs 🇩🇪 769 82 287ms 25 Jun 2023 395th epic-programmer-guy 769 82 962ms 3 Jan 2024 399th MarcMush 🇫🇷 768 64 357ms 8 Mar 2022 399th DialFrost 🇸🇬 768 64 365ms 17 Jan 2023 First Prev 321–400 of 1,586 Next Last