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?
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 241st abailey2020 🇺🇸 545 101 41ms 13 Dec 2020 241st Starwort 🇬🇧 545 101 12ms 9 Nov 2022 241st Glinte 545 101 10ms 13 Dec 2023 241st qpwoeirut 545 101 11ms 31 Oct 2025 245th catileptic 539 102 28ms 23 Oct 2018 245th ntsd 🇹🇭 539 102 10ms 18 Oct 2019 245th andrewjc2000 539 102 11ms 9 Jul 2025 248th DaleNaci 534 103 13ms 17 Aug 2018 248th Jacob385 534 103 31ms 5 Mar 2024 250th Sora-the-explora 529 104 13ms 15 Aug 2018 250th Mikey-Beep 🇬🇧 529 104 11ms 31 Aug 2023 252nd Dazza314 🇬🇧 524 105 11ms 7 Nov 2020 252nd Drew-j-Smith 524 105 11ms 5 Nov 2022 252nd TaserTheFox 🇺🇸 524 105 14ms 14 Jan 2023 252nd mikehanus 524 105 11ms 21 Nov 2023 252nd solisolu 524 105 15ms 30 Dec 2025 257th lukasthaler 519 106 62ms 10 Sep 2020 257th Eilonlif 🇮🇱 519 106 15ms 27 Aug 2022 257th MichalMarsalek 🇨🇿 519 106 10ms 29 Oct 2022 257th StardustGogeta 519 106 14ms 8 May 2023 257th anderium 519 106 13ms 5 Aug 2023 257th cros107 🇦🇺 519 106 16ms 15 Oct 2023 257th Deedogg 519 106 10ms 30 Oct 2025 257th zgialor-lab 519 106 12ms 27 Feb 2026 265th tomtheisen 🇺🇸 514 107 15ms 3 Aug 2019 265th AkashTandon167 514 107 1,253ms 26 Sep 2019 265th blashley 514 107 15ms 24 Jan 2020 265th 77Tigers 514 107 38ms 29 May 2021 265th pengu1n-master 514 107 15ms 11 Oct 2021 265th myleopard 514 107 15ms 15 Oct 2021 265th knutae 🇳🇴 514 107 13ms 1 Nov 2021 265th Altrul 514 107 12ms 11 Jan 2022 265th MaxElf999 514 107 15ms 29 Sep 2022 265th za3k 514 107 15ms 8 Nov 2022 265th DrPiranoid 514 107 15ms 11 Nov 2022 265th TobyBoyne 🇬🇧 514 107 15ms 16 Jan 2023 265th jfallon1997 514 107 14ms 29 Apr 2024 265th stertooy 🇧🇪 514 107 15ms 9 Jun 2024 265th rollershutter 514 107 11ms 18 Nov 2024 280th petar-donchev 509 108 13ms 2 Sep 2019 280th Informagier 509 108 53ms 17 Sep 2020 280th KrausRaus 🇺🇸 509 108 11ms 9 Apr 2021 280th urojony 🇵🇱 509 108 15ms 27 May 2021 280th petroselo 509 108 15ms 29 Dec 2021 280th kyleclaassen 509 108 14ms 11 Mar 2022 280th ehulinsky 🇺🇸 509 108 27ms 7 May 2023 280th tobyLovick 509 108 15ms 11 Dec 2023 280th jbjd 509 108 22ms 23 Feb 2024 280th sultan 509 108 36ms 27 Mar 2024 280th fgrosshans 🇫🇷 509 108 15ms 17 Jul 2024 280th 40fied4t 509 108 35ms 5 May 2025 292nd zdzc 505 109 15ms 8 Feb 2018 292nd ebicochineal 505 109 82ms 21 Jun 2019 292nd dzhang314 505 109 42ms 13 Aug 2019 292nd loserface69 505 109 14ms 14 Mar 2020 292nd tpaxman 🇨🇦 505 109 16ms 2 Dec 2020 292nd stordev 505 109 15ms 26 Feb 2021 292nd Omega65536 🇩🇪 505 109 14ms 24 Nov 2022 292nd BREMAUCY 🇫🇷 505 109 11ms 11 May 2023 292nd AlexanderFair 505 109 13ms 18 Jul 2023 292nd vhoulbreque 🇫🇷 505 109 15ms 9 Apr 2024 292nd Lewenhaupt 505 109 55ms 19 Apr 2024 303rd PiterAnnema 500 110 16ms 28 Aug 2020 303rd cesarm4 500 110 126ms 6 Jan 2021 303rd HerLovelyTentacles 500 110 14ms 8 Feb 2021 303rd forlack 500 110 15ms 29 Oct 2021 303rd Natanaelel 🇸🇪 500 110 12ms 16 Aug 2022 303rd fredrik-bakke 🇳🇴 500 110 50ms 3 Nov 2022 303rd randolchance 500 110 16ms 15 Jan 2023 303rd jtaxen 500 110 12ms 23 Jul 2023 303rd EnTerr 500 110 20ms 25 Aug 2024 303rd jamesthekee 500 110 15ms 25 Jan 2025 303rd Googolplexo 🇷🇺 500 110 26ms 4 hours ago 314th tkwa 495 111 15ms 4 Dec 2018 314th jrobert2 495 111 14ms 19 Dec 2018 314th fynnkroeger 495 111 15ms 18 Feb 2021 314th jameslindesay 495 111 14ms 24 Feb 2021 314th evanrittner 495 111 14ms 5 Jun 2021 314th badboj40 495 111 13ms 27 Dec 2022 314th Pale-Vessel 495 111 13ms 27 Dec 2023 First Prev 241–320 of 813 Next Last
