The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Arabic to Roman 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 240th m42km 451 195 24ms 14 Jan 2024 240th BREMAUCY 🇫🇷 451 195 21ms 29 Jan 2024 240th WillConker 451 195 20ms 10 Aug 2024 240th zgialor-lab 451 195 27ms 24 days ago 245th wilkij1 449 196 19ms 16 Jun 2018 245th lukasthaler 449 196 24ms 9 Sep 2020 245th asadullayev 449 196 22ms 4 Mar 2021 245th geooff 449 196 22ms 11 Sep 2023 245th BlankSpruce 449 196 24ms 31 Aug 2025 250th BrenSchaap 447 197 21ms 21 Oct 2021 250th aksyristos 447 197 24ms 27 Jan 2023 250th ABC00012345 447 197 23ms 1 May 2024 250th michaelmgreer 447 197 22ms 9 Oct 2025 254th zdzc 444 198 23ms 26 Mar 2018 254th Florian-Mt 444 198 24ms 14 Nov 2023 254th l-donovan 444 198 21ms 6 Feb 2024 257th lelbal 442 199 19ms 7 Aug 2025 257th qpwoeirut 442 199 17ms 14 Aug 2025 257th karadigm01 442 199 19ms 16 days ago 260th hoodadam 440 200 17ms 5 Jun 2019 260th jiaminglimjm 🇲🇾 440 200 23ms 4 Jul 2020 260th Pena86 440 200 18ms 6 Jan 2022 260th damoc1es 440 200 22ms 4 Dec 2022 260th zekestephens 440 200 24ms 25 Oct 2025 265th msrawson 438 201 26ms 31 Aug 2018 265th ValNyz 438 201 22ms 23 Feb 2022 265th timhaj 🇸🇮 438 201 21ms 28 Aug 2024 265th aalec 438 201 26ms 22 Nov 2025 269th CatsAreFluffy 436 202 32ms 25 Nov 2022 269th tobeannouncd 436 202 21ms 30 Jan 2024 269th epic-programmer-guy 436 202 24ms 17 Feb 2024 272nd wrhm 433 203 24ms 15 Dec 2020 272nd richard-oelze 🇩🇪 433 203 26ms 4 Apr 2021 272nd lemogne 433 203 33ms 2 Jun 2022 272nd qwjhvbxi 433 203 19ms 6 Feb 2024 276th AkashTandon167 431 204 22ms 7 Nov 2019 276th simon-thornton_pace 431 204 25ms 12 Aug 2023 276th yousefalizadeh 431 204 26ms 6 Apr 2024 279th alexeldridge 429 205 19ms 12 Aug 2024 279th sciencejiho 429 205 21ms 26 Sep 2024 281st Narik1 427 206 22ms 3 Apr 2023 282nd tomh1012 425 207 29ms 10 Nov 2020 282nd dgambit 425 207 20ms 16 Dec 2025 284th 4ndyJ 🇬🇧 423 208 23ms 28 Feb 2023 284th ashscodes 423 208 20ms 19 Nov 2023 286th goombado 421 209 25ms 19 Oct 2020 286th stordev 421 209 27ms 26 Feb 2021 288th scpchicken 🇵🇼 419 210 25ms 12 Jan 2022 288th andre-lameirinhas 🇵🇹 419 210 24ms 9 May 2023 288th AbhilashaTandon 419 210 22ms 21 Sep 2023 291st markus-rekdal 417 211 21ms 6 Dec 2019 291st keegan-t 🇨🇦 417 211 27ms 22 Sep 2021 291st Drew-j-Smith 417 211 26ms 25 Apr 2022 291st bac0id 417 211 39ms 29 Jun 2024 295th jbjd 413 213 20ms 23 Nov 2024 295th Emutis 🇱🇹 413 213 19ms 5 Aug 2025 297th vodker1 411 214 23ms 7 Mar 2022 297th trist224 🇫🇷 411 214 20ms 25 Dec 2022 297th Binod-Chhantyal 411 214 30ms 29 Apr 2025 297th Code-Coder-coder 411 214 22ms 13 Oct 2025 301st boxjelly 409 215 22ms 9 Feb 2021 301st jameslindesay 409 215 17ms 25 Feb 2021 303rd inverseLorentz 🇦🇺 407 216 17ms 13 Jun 2022 303rd TheZwierzLF 🇵🇱 407 216 46ms 13 Dec 2025 305th KiwiLT 406 217 19ms 28 Nov 2022 305th r-benson 🇬🇧 406 217 21ms 1 Feb 2023 307th relet 404 218 23ms 10 Aug 2018 307th alangodfrey 404 218 32ms 18 Feb 2019 307th galloj 🇨🇿 404 218 24ms 10 Jan 2023 307th Ailko 🇧🇪 404 218 19ms 17 Jan 2025 311th dymowski 402 219 31ms 9 Jul 2019 311th elephantpanda 402 219 18ms 31 Aug 2022 311th camieac 🇬🇧 402 219 23ms 17 Nov 2023 311th Pale-Vessel 402 219 25ms 20 Dec 2023 311th xbxbxb007 402 219 20ms 10 Jan 2024 316th zuparnowa 400 220 21ms 11 Feb 2019 316th henrytranter 400 220 18ms 20 Sep 2019 316th mrnomm 400 220 23ms 30 Oct 2020 316th Vaekor 400 220 23ms 16 Nov 2020 316th Liastrae 400 220 23ms 22 Aug 2022 First Prev 241–320 of 507 Next Last
