The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Arrows 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 155th RobertHoeh 497 197 12ms 3 Mar 2025 155th gamk3 497 197 14ms 6 May 2025 163rd DrPrettyman 495 198 14ms 12 Jul 2023 163rd jacekwladzinski 495 198 11ms 8 Oct 2025 165th asheeri 492 199 14ms 23 Aug 2021 165th BrenSchaap 492 199 13ms 21 Oct 2021 165th scpchicken 🇵🇼 492 199 12ms 7 Mar 2022 165th thiccaxe 492 199 13ms 3 Oct 2022 165th DialFrost 🇸🇬 492 199 11ms 11 Feb 2023 165th jmerle 🇳🇱 492 199 15ms 17 Jul 2023 165th dainiak 492 199 14ms 23 Jul 2023 165th AbhilashaTandon 492 199 14ms 24 Sep 2023 165th Mabeloid 🇳🇴 492 199 11ms 7 Sep 2024 165th JunkIce 492 199 12ms 4 Oct 2024 165th wuduculfre 492 199 13ms 29 Jul 2025 165th katss2 492 199 14ms 14 Aug 2025 177th SirFireball3521 490 200 45ms 25 Jan 2023 177th wuzekai518 490 200 14ms 28 Jun 2024 177th kistlerf 🇨🇭 490 200 13ms 14 May 2025 180th Bonjour27891 🇻🇳 488 201 13ms 4 Mar 2022 180th guilhem-roy 🇫🇷 488 201 15ms 9 May 2022 180th MaxElf999 488 201 12ms 19 Sep 2022 180th tri1212 🇻🇳 488 201 11ms 3 Jun 2024 180th cykim8811 488 201 11ms 10 Jul 2024 180th vgamula 🇺🇦 488 201 11ms 15 Jul 2025 180th Alex-Huggett 🇬🇧 488 201 14ms 14 Sep 2025 187th marcin7Cd 485 202 13ms 25 Aug 2021 187th mbittner20 485 202 13ms 22 Sep 2024 189th dionjw 483 203 13ms 22 Mar 2022 189th pascscha 483 203 16ms 28 Mar 2022 189th za3k 483 203 14ms 12 Oct 2022 189th GolfingSuccess 🇬🇷 483 203 14ms 5 Dec 2022 189th suhren 483 203 13ms 1 Oct 2023 194th Fishron 476 206 15ms 13 Jun 2022 194th ValentinCassayre 476 206 14ms 18 Oct 2023 196th LostSyntax21 🇬🇧 473 207 13ms 6 Dec 2025 197th bbakersmith 467 210 12ms 6 Jun 2022 198th SniperSmiley 🇺🇸 464 211 13ms 18 Dec 2022 199th SB-945 462 212 13ms 14 Jul 2023 200th kyleclaassen 460 213 13ms 11 Mar 2022 200th yuchuehw 460 213 15ms 21 Jan 2024 200th RaBa21 🇭🇺 460 213 12ms 11 Aug 2025 203rd NerdyMcNerd42 458 214 14ms 25 Oct 2022 204th CatsAreFluffy 456 215 13ms 30 Dec 2022 204th ridingqwerty 🇺🇸 456 215 14ms 13 Dec 2023 206th amollberg 🇸🇪 454 216 12ms 8 Jan 2022 207th Andrey135296 452 217 12ms 17 Sep 2024 208th resoNathan 450 218 14ms 5 Jul 2024 209th henrytranter 447 219 14ms 1 Oct 2021 209th rschwa6308 🇺🇸 447 219 12ms 5 May 2023 209th yanjs 447 219 13ms 3 Jul 2025 212th mdnestor 445 220 12ms 27 Dec 2022 213th mokymok 🇺🇸 443 221 14ms 17 Nov 2021 213th hiichbindermax 443 221 12ms 5 Oct 2024 215th lovernj 439 223 15ms 21 Jan 2022 215th Ailko 🇧🇪 439 223 11ms 5 May 2022 215th karhuthebear 439 223 14ms 11 May 2022 215th andre-lameirinhas 🇵🇹 439 223 13ms 26 Apr 2023 215th anarconic 439 223 13ms 7 Dec 2023 215th ffelixm 439 223 12ms 4 Jun 2025 215th Andrey2001 439 223 14ms 25 Nov 2025 222nd BobDotCom 438 224 14ms 25 Mar 2022 222nd sleepyStick 438 224 13ms 14 Jul 2022 224th 1231234md5 🇨🇳 436 225 14ms 15 Dec 2023 224th billythegoat356 436 225 14ms 5 Jun 2024 226th trist224 🇫🇷 434 226 13ms 21 Feb 2023 227th mothcolada 🇺🇸 432 227 13ms 8 Oct 2021 227th zt14427 432 227 14ms 28 Sep 2023 227th ballaire 432 227 14ms 27 Jan 2024 227th jatloe 432 227 14ms 23 Oct 2024 231st tobyLovick 430 228 13ms 10 Dec 2023 231st mathisfun271 430 228 12ms 6 Mar 2024 231st Mefred 430 228 14ms 29 Oct 2025 234th twocatsinatrenchcoat 428 229 13ms 14 Apr 2022 234th cthierfelder 🇲🇨 428 229 13ms 14 Nov 2025 234th tomh1012 428 229 11ms 18 Feb 2026 237th EthanGrant1 426 230 14ms 10 Nov 2022 238th MichaelMBradley 🇨🇦 424 231 22ms 27 Feb 2022 238th Florian-Mt 424 231 11ms 27 Nov 2023 238th l-donovan 424 231 13ms 6 Feb 2024 First Prev 161–240 of 368 Next Last
