The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Leap Years in Python 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 57th lifthrasiir 🇰🇷 915 47 17ms 20 Nov 2024 57th plcc0 915 47 10ms 6 Mar 2025 57th jipsong 🇩🇪 915 47 10ms 1 Apr 2025 57th KasperKivimaeki 🇫🇮 915 47 15ms 14 May 2025 57th keelimeguy 🇺🇸 915 47 20ms 16 May 2025 57th Flekay 🇩🇪 915 47 16ms 9 Aug 2025 57th janlelis 915 47 16ms 14 Aug 2025 57th snoozingnewt 🇨🇦 915 47 16ms 26 Sep 2025 57th Emutis 🇱🇹 915 47 19ms 25 Oct 2025 57th CommandLeo 🇮🇹 915 47 17ms 30 Nov 2025 57th Lv0Sys 🇵🇱 915 47 16ms 2 Dec 2025 92nd prplz 🇦🇺 896 48 16ms 19 Sep 2019 92nd TFeld00 🇩🇰 896 48 10ms 3 Mar 2020 92nd GolfingSuccess 🇬🇷 896 48 15ms 17 Nov 2020 92nd urojony 🇵🇱 896 48 21ms 26 Dec 2020 92nd btjones0 896 48 17ms 30 Dec 2020 92nd Indivicivet 896 48 17ms 22 Mar 2021 92nd NewDefectus 🇮🇱 896 48 16ms 27 May 2021 92nd Bubbler-4 896 48 9ms 16 Nov 2021 92nd KatieLG 🇬🇧 896 48 16ms 2 Jun 2022 92nd k3w1k0d3r 896 48 10ms 29 Jun 2022 92nd FlorianCassayre 🇫🇷 896 48 16ms 6 Mar 2023 92nd quimey 896 48 15ms 15 Jun 2023 92nd Andriamanitra 🇫🇮 896 48 17ms 10 Jul 2023 92nd stefangimmillaro 896 48 9ms 18 Jul 2023 92nd Alex-x90 🇺🇸 896 48 10ms 27 Jul 2023 92nd sultan 896 48 10ms 16 Feb 2024 92nd driri85 896 48 10ms 16 Feb 2024 92nd wen1now 896 48 10ms 1 Mar 2024 92nd cpchrispye 896 48 16ms 20 Apr 2024 92nd 5cw 🇺🇸 896 48 17ms 6 May 2024 92nd egasyelir 896 48 17ms 15 Jul 2024 92nd bzijlema 🇳🇱 896 48 17ms 11 Sep 2024 92nd moustave 896 48 16ms 9 Jan 2025 92nd rollershutter 896 48 16ms 21 Jan 2025 92nd Yax42 🇫🇷 896 48 9ms 17 Jun 2025 92nd luuumine 🇫🇷 896 48 10ms 29 Oct 2025 92nd solisolu 896 48 17ms 1 Jan 2026 119th rschwa6308 🇺🇸 878 49 15ms 4 Apr 2019 119th TinyTheBrontosaurus 878 49 10ms 19 Oct 2019 119th niranjan09 878 49 9ms 10 Jul 2020 119th argusdusty 🇺🇸 878 49 10ms 26 Dec 2020 119th o0lit3 🇺🇸 878 49 9ms 24 Feb 2021 119th BBoehm 🇩🇪 878 49 9ms 24 Feb 2021 119th vezzick 878 49 10ms 4 Mar 2021 119th Sp3000 🇦🇺 878 49 9ms 5 May 2021 119th Shanethegamer 🇺🇸 878 49 10ms 29 May 2021 119th RYNO8 878 49 19ms 3 Sep 2021 119th nipzu 878 49 9ms 29 Dec 2021 119th commandz0 🇺🇸 878 49 16ms 19 Sep 2022 119th randolchance 878 49 15ms 20 Jan 2023 119th SirFireball3521 878 49 15ms 4 Feb 2023 119th ljweel 878 49 9ms 13 Feb 2023 119th anter69 🇭🇺 878 49 10ms 23 Feb 2023 119th cefqrn 878 49 10ms 17 Jul 2023 119th DavidHospital 878 49 16ms 22 Sep 2023 119th tobyLovick 878 49 17ms 29 Nov 2023 119th 051 🇸🇬 878 49 16ms 25 Dec 2023 119th duckyluuk 🇳🇱 878 49 13ms 23 Jan 2024 119th codingisgreatbutiamnot 878 49 9ms 10 Aug 2024 119th Languag3 878 49 16ms 4 Mar 2025 119th yanjs 878 49 10ms 3 Jul 2025 119th cy1366371760 878 49 10ms 3 Jul 2025 119th wuduculfre 878 49 10ms 22 Jul 2025 119th ApoChagi 878 49 17ms 13 Oct 2025 119th ian-h-chamberlain 🇺🇸 878 49 10ms 4 Nov 2025 147th tkwa 860 50 13ms 4 Dec 2018 147th villfa 860 50 16ms 27 May 2019 147th TobyBoyne 🇬🇧 860 50 16ms 31 May 2019 147th DarkBlueWall 860 50 16ms 28 Apr 2020 147th nexaitch 860 50 15ms 10 Jul 2020 147th thisishowmymindworks 🇳🇴 860 50 21ms 6 Aug 2020 147th Maltysen 860 50 21ms 25 Sep 2020 147th The3gs 860 50 16ms 13 Oct 2020 147th ehulinsky 🇺🇸 860 50 10ms 10 Nov 2021 147th ZakkkkAttackkkk 🇵🇭 860 50 10ms 13 Nov 2021 147th Pyroan 860 50 16ms 15 Dec 2021 147th SirBogman 🇺🇸 860 50 16ms 6 Jan 2022 147th Irratix 🇳🇱 860 50 10ms 20 Apr 2022 147th Romain-1 🇫🇷 860 50 16ms 4 May 2022 First Prev 81–160 of 1,122 Next Last