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?
Leap Years in Swift 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 1st Lydxn 🇨🇦 1,000 43 2,259ms 23 Sep 2021 2nd primo-ppcg 🇹🇭 977 44 483ms 2 May 2020 2nd lynn 977 44 470ms 10 Sep 2021 2nd Steffan153 🇫🇮 977 44 101ms 5 days ago 2nd JayXon 🇺🇸 977 44 1,055ms 12 hours ago 6th MeWhenI 🇻🇦 956 45 1,033ms 12 Oct 2022 6th sean-niemann 🇺🇸 956 45 87ms 6 May 2024 8th MWI-polygolf 935 46 79ms 18 Feb 2023 8th steffan-polygolf 935 46 83ms 19 Feb 2023 8th DialFrost 🇸🇬 935 46 98ms 8 Nov 2023 8th dokutan 935 46 84ms 25 Sep 2024 12th janbehrens 🇩🇪 896 48 91ms 22 May 2021 12th stefangimmillaro 896 48 84ms 19 Feb 2023 14th simon-biber 878 49 88ms 19 May 2022 14th KatieLG 🇬🇧 878 49 88ms 13 Jan 2023 16th rowan-OzRunways 860 50 87ms 9 Aug 2020 16th p-vf 🇨🇭 860 50 85ms 25 Oct 2021 16th HumanoidCPU 860 50 3,498ms 14 Feb 2024 16th albanian-laundromat 860 50 89ms 11 Mar 2025 20th FrederikHutfless 🇩🇪 843 51 88ms 12 Jan 2023 20th StronkCheese 🇺🇸 843 51 78ms 4 Feb 2023 20th msbranicky 843 51 91ms 6 Jul 2023 23rd stuartcarnie 811 53 92ms 18 Apr 2020 23rd roguh 🇬🇹 811 53 93ms 14 Jan 2024 25th johnnythedoggie 796 54 92ms 15 Oct 2020 26th Shanethegamer 🇺🇸 782 55 119ms 22 Apr 2025 27th timvermeulen 768 56 85ms 19 Jan 2020 27th snoozingnewt 🇨🇦 768 56 91ms 6 Oct 2023 27th Yewzir 🇧🇪 768 56 86ms 7 Feb 2024 30th jacky-tay 🇳🇿 741 58 92ms 17 May 2021 30th Betuaredead 741 58 90ms 6 Jan 2023 30th kaascevich 741 58 109ms 8 Jul 2025 30th Arkadios200 741 58 89ms 11 Oct 2025 34th cure-honey 🇯🇵 729 59 80ms 5 Jul 2021 35th DavidSkrundz 705 61 97ms 25 Jan 2020 36th jordanperry 683 63 86ms 19 Jan 2020 36th nick99nack 683 63 86ms 13 Feb 2022 36th RoscoeDaWah 🇬🇧 683 63 92ms 13 Feb 2022 36th The-Wolfson 683 63 92ms 17 Dec 2024 40th Smetalo 672 64 94ms 25 Aug 2022 41st perfunction 662 65 84ms 29 Jan 2020 42nd vaughad 652 66 81ms 29 Jan 2020 43rd cmdrsabre 632 68 87ms 31 Jan 2020 44th jalone87 573 75 96ms 1 Sep 2021 45th AaronKreipe 538 80 88ms 8 Mar 2020 46th sam-sole 473 91 88ms 1 Apr 2022 47th Shadow1975x 467 92 86ms 14 Aug 2020 48th Cesium06 162 265 91ms 18 Jan 2020 49th retrohun 58 744 74ms 27 Dec 2022 49th Mabeloid 🇳🇴 58 744 70ms 22 Sep 2024 49th CaedenHarper 🇨🇦 58 744 70ms 16 Aug 2025 52nd mokymok 🇺🇸 49 883 76ms 10 Nov 2021 53rd KatieLG-Transpiler 🇬🇧 48 901 654ms 10 Jul 2022 1–53 of 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