The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Emirp Numbers in Python 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 75th namelessiw 887 62 9ms 5 Mar 2024 75th codingisgreatbutiamnot 887 62 9ms 7 Aug 2024 75th lifthrasiir 🇰🇷 887 62 9ms 21 Nov 2024 75th snoozingnewt 🇨🇦 887 62 9ms 28 Nov 2025 75th JOrE20 887 62 9ms 25 Feb 2026 86th kevinmchung 873 63 11ms 24 Feb 2018 86th tjtnorton 873 63 10ms 4 Dec 2018 86th leon-w 873 63 9ms 4 Jan 2019 86th hoodadam 873 63 9ms 5 Jul 2019 86th jcl5m1 873 63 9ms 27 Jul 2019 86th jared-hughes 873 63 9ms 7 Oct 2021 86th kellantech 873 63 10ms 3 Jun 2023 86th htareque 873 63 9ms 6 Oct 2023 86th zwxzwxzwx21 873 63 10ms 7 Feb 2024 95th msrawson 859 64 9ms 31 Aug 2018 95th mortimervonchappuis 859 64 10ms 17 Mar 2020 95th OllieBoyne 🇬🇧 859 64 9ms 30 Dec 2020 95th KatieLG 🇬🇧 859 64 11ms 6 May 2021 95th Fishron 859 64 17ms 19 Oct 2021 95th msbranicky 859 64 9ms 25 Jul 2023 95th jatloe 859 64 10ms 29 Oct 2024 95th ffelixm 859 64 10ms 12 Jun 2025 95th luuumine 🇫🇷 859 64 17ms 17 Nov 2025 95th Babafaba 859 64 11ms 17 Nov 2025 95th Flekay 🇩🇪 859 64 11ms 15 Feb 2026 106th hirosuzuki 846 65 8ms 24 Feb 2019 106th trist224 🇫🇷 846 65 10ms 15 Nov 2022 108th jacklynnepenick 833 66 58ms 22 Aug 2021 108th commandz0 🇺🇸 833 66 10ms 22 Nov 2023 110th tburette 821 67 10ms 26 Dec 2018 110th sunleonid 821 67 28ms 17 Dec 2025 110th H3XDaemon 821 67 10ms 20 Dec 2025 113th HPWiz 🇳🇿 809 68 11ms 30 Aug 2022 113th 4atj 809 68 11ms 30 Jun 2025 115th Bonjour27891 🇻🇳 797 69 10ms 14 Jul 2022 115th KasperKivimaeki 🇫🇮 797 69 10ms 17 Dec 2025 117th nstearns96 🇬🇧 786 70 16ms 6 Jan 2023 117th bizy-coder 786 70 11ms 17 Dec 2025 119th NewDefectus 🇮🇱 775 71 10ms 16 Dec 2021 119th rschwa6308 🇺🇸 775 71 11ms 12 May 2023 119th zbreit 🇺🇸 775 71 11ms 20 May 2023 119th blaztoma 🇱🇹 775 71 10ms 10 Nov 2025 123rd Lifesorder 764 72 10ms 12 Oct 2018 123rd nwellnhof 🇩🇪 764 72 9ms 4 Feb 2021 123rd annaproxy 764 72 10ms 28 Dec 2021 123rd yzhs 🇩🇪 764 72 11ms 20 Jul 2022 123rd fourth-bit 764 72 10ms 2 Jul 2023 128th xorraxrax 753 73 10ms 26 Oct 2019 128th btjones0 753 73 11ms 15 Jul 2022 128th Bmrl7 753 73 12ms 26 Feb 2024 128th firegene 🇮🇪 753 73 11ms 24 Feb 2026 132nd davitf 743 74 11ms 19 Nov 2018 132nd ydevor 🇮🇱 743 74 10ms 26 Nov 2020 132nd itsjustfreekie 743 74 12ms 19 Sep 2021 132nd ZakkkkAttackkkk 🇵🇭 743 74 12ms 26 Dec 2021 132nd domingues 🇵🇹 743 74 9ms 10 Aug 2022 132nd jakobkordez 🇸🇮 743 74 56ms 31 Oct 2022 132nd scpchicken 🇵🇼 743 74 10ms 17 Jan 2023 132nd aksyristos 743 74 11ms 26 Jan 2023 140th FlorianCassayre 🇫🇷 733 75 13ms 18 Sep 2023 141st Nic0M 724 76 10ms 13 Aug 2023 141st vgamula 🇺🇦 724 76 13ms 10 Jul 2024 141st Emutis 🇱🇹 724 76 10ms 10 Nov 2025 141st Lv0Sys 🇵🇱 724 76 10ms 20 Feb 2026 145th jarekwg 714 77 9ms 19 Apr 2019 145th chethus 714 77 10ms 10 May 2021 145th mokymok 🇺🇸 714 77 12ms 17 Nov 2021 145th StefanHabel 🇨🇦 714 77 10ms 26 Mar 2023 145th keelimeguy 🇺🇸 714 77 17ms 5 Nov 2024 150th stevelamm 705 78 9ms 3 Oct 2018 150th Sticky-Bits 705 78 9ms 18 Apr 2019 150th sk- 705 78 10ms 17 Sep 2019 150th RDShah 705 78 11ms 3 Aug 2020 150th hellwue 705 78 9ms 15 Feb 2023 150th 2011-Chan-Ethan 705 78 15ms 20 Jul 2023 150th davecame 705 78 9ms 14 Aug 2023 157th GeoffroyF 696 79 11ms 16 May 2018 157th Mr-Xcoder 696 79 10ms 8 Sep 2018 157th vladyslavprosolupov 696 79 10ms 27 May 2019 157th giacomogallina 696 79 33ms 13 Jun 2019 First Prev 81–160 of 812 Next Last
