The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 29 hours. Why not try and solve them ahead of time?
Arabic to Roman 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 239th l-donovan 626 198 21ms 6 Feb 2024 242nd lelbal 623 199 19ms 7 Aug 2025 242nd qpwoeirut 623 199 17ms 14 Aug 2025 242nd karadigm01 623 199 19ms 22 days ago 245th hoodadam 620 200 17ms 5 Jun 2019 245th Pena86 620 200 18ms 6 Jan 2022 245th damoc1es 620 200 22ms 4 Dec 2022 245th zekestephens 620 200 24ms 25 Oct 2025 249th msrawson 617 201 26ms 31 Aug 2018 249th ValNyz 617 201 22ms 23 Feb 2022 249th timhaj 🇸🇮 617 201 21ms 28 Aug 2024 249th aalec 617 201 26ms 22 Nov 2025 253rd CatsAreFluffy 614 202 32ms 25 Nov 2022 253rd tobeannouncd 614 202 21ms 15 Sep 2023 253rd epic-programmer-guy 614 202 24ms 4 Jan 2024 256th wrhm 611 203 24ms 15 Dec 2020 256th richard-oelze 🇩🇪 611 203 26ms 4 Apr 2021 256th lemogne 611 203 33ms 2 Jun 2022 256th kyleclaassen 611 203 26ms 22 May 2023 256th qwjhvbxi 611 203 19ms 6 Feb 2024 261st AkashTandon167 608 204 22ms 7 Nov 2019 261st jiaminglimjm 🇲🇾 608 204 23ms 4 Jul 2020 261st simon-thornton_pace 608 204 25ms 12 Aug 2023 261st yousefalizadeh 608 204 26ms 6 Apr 2024 265th alexeldridge 605 205 19ms 12 Aug 2024 265th sciencejiho 605 205 21ms 26 Sep 2024 265th greentruff 605 205 20ms 7 Dec 2025 268th Narik1 602 206 22ms 3 Apr 2023 269th tomh1012 599 207 29ms 10 Nov 2020 269th dgambit 599 207 20ms 16 Dec 2025 271st 4ndyJ 🇬🇧 596 208 23ms 28 Feb 2023 271st ashscodes 596 208 20ms 19 Nov 2023 273rd goombado 593 209 25ms 19 Oct 2020 273rd stordev 593 209 27ms 26 Feb 2021 275th scpchicken 🇵🇼 590 210 25ms 12 Jan 2022 275th andre-lameirinhas 🇵🇹 590 210 24ms 9 May 2023 275th AbhilashaTandon 590 210 22ms 21 Sep 2023 278th markus-rekdal 588 211 21ms 6 Dec 2019 278th keegan-t 🇨🇦 588 211 27ms 22 Sep 2021 278th Drew-j-Smith 588 211 26ms 25 Apr 2022 278th bac0id 588 211 39ms 29 Jun 2024 282nd jbjd 582 213 20ms 23 Nov 2024 282nd Emutis 🇱🇹 582 213 19ms 5 Aug 2025 284th vodker1 579 214 23ms 7 Mar 2022 284th trist224 🇫🇷 579 214 20ms 25 Dec 2022 284th Binod-Chhantyal 579 214 30ms 29 Apr 2025 284th Code-Coder-coder 579 214 22ms 13 Oct 2025 288th boxjelly 577 215 22ms 9 Feb 2021 288th jameslindesay 577 215 17ms 25 Feb 2021 288th evan18c 577 215 23ms 22 Sep 2021 291st inverseLorentz 🇦🇺 574 216 17ms 13 Jun 2022 291st TheZwierzLF 🇵🇱 574 216 46ms 13 Dec 2025 293rd KiwiLT 571 217 19ms 28 Nov 2022 293rd r-benson 🇬🇧 571 217 21ms 1 Feb 2023 295th relet 569 218 23ms 10 Aug 2018 295th alangodfrey 569 218 32ms 18 Feb 2019 295th galloj 🇨🇿 569 218 24ms 10 Jan 2023 295th Ailko 🇧🇪 569 218 19ms 17 Jan 2025 295th mishak-sys 569 218 21ms 3 hours ago 300th dymowski 566 219 31ms 9 Jul 2019 300th elephantpanda 566 219 18ms 31 Aug 2022 300th camieac 🇬🇧 566 219 23ms 17 Nov 2023 300th Pale-Vessel 566 219 25ms 20 Dec 2023 300th xbxbxb007 566 219 20ms 10 Jan 2024 305th zuparnowa 564 220 21ms 11 Feb 2019 305th henrytranter 564 220 18ms 20 Sep 2019 305th mrnomm 564 220 23ms 30 Oct 2020 305th Vaekor 564 220 23ms 16 Nov 2020 305th Liastrae 564 220 23ms 22 Aug 2022 305th quimey 564 220 25ms 29 Aug 2023 305th dvckyduck 🇧🇬 564 220 20ms 24 Oct 2025 312th vezzick 561 221 34ms 7 Mar 2021 312th DrPiranoid 561 221 21ms 27 Sep 2022 312th firegene 🇮🇪 561 221 22ms 2 Apr 2023 312th cingulataluke 561 221 56ms 29 Aug 2023 316th temoto 559 222 22ms 20 Sep 2018 316th valeria-227 559 222 27ms 5 May 2025 316th logalex8369 🇺🇸 559 222 22ms 19 Dec 2025 319th Malin001 556 223 23ms 3 Jan 2020 319th Thinthiner 556 223 31ms 9 Sep 2020 First Prev 241–320 of 508 Next Last
