The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 days. Why not try and solve them ahead of time?
Foo Fizz Buzz Bar 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 800th LookAgain2 375 176 11ms 20 Dec 2022 800th OneAsterisk 375 176 12ms 27 Oct 2023 803rd BradyRhora 373 177 14ms 17 Oct 2023 804th 104210 371 178 18ms 21 Aug 2022 804th HunterC14 371 178 18ms 20 Oct 2024 806th holzay 369 179 13ms 6 Aug 2024 807th lalkkot 365 181 14ms 28 Apr 2022 808th dmitrijslasko 🇱🇻 361 183 12ms 31 Jan 2024 808th carlsoncorey16 361 183 18ms 4 Oct 2024 810th zerickso 357 185 10ms 17 Mar 2024 811th Zhenyu-Bo 355 186 11ms 1 Aug 2025 812th realbencomo 353 187 11ms 22 Jan 2025 813th ltdroy 346 191 14ms 25 Jul 2022 814th OffSecVik 344 192 12ms 23 Feb 2023 815th r-i-c-e 342 193 11ms 4 Jul 2023 816th dylanjones92 337 196 11ms 17 Jan 2024 817th AsceticPy 335 197 12ms 4 Dec 2022 818th UriyaBA 332 199 11ms 16 Mar 2023 819th Fmbalbuena 328 201 19ms 27 Nov 2021 820th charoilelie 327 202 11ms 2 Oct 2025 821st murrrp 325 203 12ms 15 Mar 2023 822nd jaxmattfair 🇺🇸 316 209 12ms 14 Jan 2023 823rd esnethen 307 215 19ms 14 Jan 2023 824th marshmallowyoshi 304 217 12ms 6 Apr 2022 825th esaelo 303 218 13ms 16 Nov 2022 826th fl3ur1nestimable 297 222 11ms 2 Apr 2022 826th my-company-my 🇲🇽 297 222 11ms 26 Jan 2025 828th DABANANAMAN120 296 223 11ms 26 Jun 2025 829th JesseWilliamson 293 225 11ms 26 Jan 2022 830th Fracture17 292 226 12ms 8 Apr 2023 830th dahappy1989 292 226 13ms 4 Nov 2023 832nd uncertaain 289 228 12ms 14 Dec 2024 833rd leionaaad 288 229 11ms 19 Oct 2023 833rd jrbud 288 229 13ms 3 Jan 2024 835th RoscoeDaWah 🇬🇧 283 233 13ms 13 Feb 2022 835th jiyaalpha 283 233 11ms 18 Oct 2024 837th LegeBeker 🇳🇱 278 237 11ms 21 Apr 2022 838th brianrainer 273 242 12ms 9 Dec 2025 839th LoddZee 263 251 12ms 10 Oct 2022 840th chrido 260 254 11ms 17 May 2025 841st be3sleyc 257 257 13ms 15 Oct 2022 842nd Patrickkiwi 255 259 11ms 4 Apr 2023 843rd calebhk98 254 260 12ms 1 Dec 2023 843rd WilliamRhind123 254 260 13ms 9 Dec 2025 845th Sceltar 251 263 11ms 20 Jun 2023 846th kevinnaviapaiva 247 267 13ms 12 Feb 2025 847th noahdorsch 246 268 12ms 2 Feb 2025 848th LouiseRamsden 243 272 18ms 10 Oct 2022 849th benhallislearning 240 275 13ms 18 Aug 2022 849th Junebug2763 240 275 11ms 23 Oct 2024 851st MajesticAlliance 238 277 11ms 15 Feb 2024 852nd ROHINI-H 237 279 14ms 15 Aug 2024 853rd bthalheim 228 289 12ms 9 Sep 2022 854th imnotAlexKnight 228 290 12ms 10 Jul 2025 855th Steven2199-cell 222 297 11ms 19 Jul 2023 856th RyanYunruiYang 219 302 11ms 26 Nov 2021 857th AidanWalter 217 304 11ms 3 Jan 2025 858th Poisoncrxss 214 308 12ms 6 May 2022 859th juliantamayo-py 214 309 12ms 20 Oct 2024 860th WillowBee7 205 322 13ms 17 Aug 2023 861st tommyshea1 204 323 12ms 7 Oct 2024 862nd jorgerojasiii 204 324 13ms 30 Sep 2022 863rd bers817 199 332 13ms 25 Aug 2023 864th alfonsoalves 195 339 12ms 26 Feb 2024 865th mkuti 194 340 12ms 7 Oct 2025 866th atazzam 🇺🇸 188 352 18ms 5 Mar 2022 867th steven-purcell 186 355 11ms 17 Jan 2024 868th krishnavemuri 173 382 12ms 18 Dec 2022 869th Piccora 171 385 13ms 3 Oct 2022 870th wilhelmines 140 470 12ms 2 Jun 2024 871st crazycoder2224 117 564 13ms 8 Jun 2023 872nd LotusASec 106 624 12ms 21 Oct 2023 873rd NJohnsonFLE 95 697 12ms 13 Jun 2024 874th Emsi7 84 786 12ms 5 Jun 2023 875th HumanoidCPU 23 2,891 12ms 11 May 2024 876th retrohun 12 5,731 11ms 27 Dec 2022 876th kurkale6ka 12 5,731 11ms 10 Dec 2023 876th Engineer2B 12 5,731 12ms 10 Jul 2024 876th averagepythondev 12 5,731 12ms 2 Jan 2026 880th KatieLG-Transpiler 🇬🇧 10 6,726 12ms 23 Jun 2022 First Prev 801–880 of 880
