The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Ordinal 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 401st adesanjo 455 143 19ms 24 Oct 2019 401st TheAristos 455 143 19ms 1 Nov 2019 401st chris-robo 455 143 12ms 8 Apr 2020 401st yuchuehw 455 143 18ms 12 Jan 2024 401st qwjhvbxi 455 143 14ms 7 Feb 2024 406th slopey112 448 145 13ms 27 Nov 2019 406th wrhm 448 145 13ms 12 Dec 2020 406th CodeAltF4 448 145 20ms 3 Mar 2022 406th jusaka 448 145 12ms 6 days ago 410th kenny14231 445 146 12ms 6 Aug 2022 410th cthierfelder 🇲🇨 445 146 12ms 9 Sep 2025 412th tayacrystals 442 147 13ms 18 Nov 2023 413th rowboat1 439 148 19ms 17 Sep 2019 413th GeorgePerreault 439 148 12ms 5 Jun 2020 415th CheeseCake628 🇳🇴 436 149 19ms 19 Mar 2023 415th SURAJMITTAL 436 149 13ms 19 Dec 2024 415th TJK-S 436 149 12ms 6 Nov 2025 418th Drew-j-Smith 433 150 12ms 6 Jun 2022 418th danielharris0 433 150 12ms 17 Jun 2023 420th markbyrne 430 151 12ms 26 Oct 2020 420th Kasci 430 151 61ms 7 Dec 2021 420th wa1ker38552 430 151 13ms 23 May 2023 420th dylanjones92 430 151 13ms 29 Jan 2024 420th clayboll99 430 151 13ms 14 Jul 2025 425th febiw 428 152 12ms 22 Mar 2020 426th louisbosqui 425 153 18ms 31 Dec 2020 426th Re-Adventures 🇮🇳 425 153 13ms 15 Feb 2022 428th HassanAliKadhem 🇧🇭 419 155 12ms 4 Jan 2022 428th AnnoyedArt1256 419 155 20ms 22 Jan 2022 428th Azearia 419 155 19ms 21 Feb 2024 431st OppositeShark 417 156 13ms 9 Apr 2022 431st zt14427 417 156 13ms 28 Dec 2024 433rd GeryonDev 411 158 12ms 13 Oct 2020 434th goombado 409 159 18ms 8 Feb 2020 434th gnash117 409 159 12ms 31 Dec 2020 436th ToE42 406 160 13ms 9 May 2021 437th shibacho 🇯🇵 404 161 12ms 29 Nov 2021 438th janga1 401 162 12ms 11 Aug 2021 438th yokasuretsu 401 162 13ms 2 Jan 2025 440th OSYCh314 🇦🇺 399 163 18ms 16 Feb 2026 441st jmmographer 396 164 12ms 11 Nov 2023 441st EnisEfe0 396 164 19ms 18 May 2025 443rd vodker1 392 166 13ms 8 Mar 2022 444th 4ndyJ 🇬🇧 387 168 12ms 16 Jan 2023 445th KiwiKoder0123 385 169 13ms 22 Oct 2019 446th volpi-m 🇫🇷 378 172 21ms 1 Sep 2020 447th Nibamot 376 173 13ms 21 Jan 2020 447th ashwinvis 376 173 12ms 19 Apr 2020 449th The3gs 371 175 13ms 13 Oct 2020 449th feherd 371 175 19ms 30 Aug 2021 451st Oscujic 365 178 14ms 11 Nov 2019 452nd gamer0kayf1n3 359 181 13ms 5 May 2023 453rd jameslindesay 348 187 11ms 26 Feb 2021 454th SOONwasTaken 344 189 12ms 1 Oct 2025 455th DGipe 325 200 20ms 6 May 2024 456th mikaelivarsson 322 202 20ms 28 Aug 2019 456th ellis-rix 322 202 13ms 19 May 2023 456th JakeDaCake36 322 202 12ms 21 Feb 2024 459th NuqieNoila 298 218 13ms 9 Aug 2019 459th jgermain48 298 218 13ms 8 Dec 2019 461st r-i-c-e 294 221 12ms 20 Jul 2023 462nd UltimateGuy0987 290 224 12ms 14 Oct 2022 463rd felixcroc 281 231 17ms 19 Apr 2022 464th HaiPaul 240 271 12ms 5 Mar 2024 465th joshuamkite 239 272 12ms 25 Aug 2023 466th Martin-Regan 234 278 13ms 13 Feb 2025 467th alfonsoalves 233 279 13ms 21 Jul 2024 468th MariuszPienkosz 214 304 12ms 20 May 2020 469th codefeld 196 331 13ms 20 Feb 2023 470th Zhenyu-Bo 157 413 13ms 1 Aug 2025 471st eli-siegel 154 422 13ms 23 Oct 2023 472nd AidanWalter 151 431 13ms 3 Jan 2025 473rd KatieLG-Transpiler 🇬🇧 4 15,911 83ms 23 Jun 2022 First Prev 401–473 of 473
