The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Fractions 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 480th j-Ewan 440 141 18ms 22 Mar 2022 480th Ailko 🇧🇪 440 141 10ms 5 May 2022 483rd Ty-Cyr 437 142 10ms 13 Jul 2023 484th lemogne 434 143 12ms 13 Nov 2021 484th faraz-t 434 143 10ms 12 Dec 2022 484th pizie11 434 143 17ms 26 Dec 2022 487th camieac 🇬🇧 431 144 17ms 14 Jun 2023 487th julian-hoelz 431 144 10ms 15 Sep 2024 489th kevdah 428 145 10ms 9 May 2022 489th tbadun 428 145 11ms 8 Oct 2022 489th madeforlosers 428 145 17ms 13 Nov 2025 492nd joll05 🇸🇪 422 147 11ms 30 Oct 2022 492nd AbhilashaTandon 422 147 10ms 22 Sep 2023 492nd abloomis 422 147 10ms 9 Jul 2025 495th Y0UR-U5ERNAME 419 148 11ms 3 Sep 2021 495th Dataen 419 148 10ms 12 Jan 2024 495th osalyer02 419 148 10ms 30 Jan 2025 495th kistlerf 🇨🇭 419 148 11ms 19 May 2025 499th eiburns 416 149 10ms 15 Sep 2023 500th bbakersmith 413 150 15ms 28 Jun 2022 500th griffinschreiber 413 150 11ms 31 Oct 2024 502nd tomc 405 153 18ms 29 Aug 2023 502nd NoneTheFewer 405 153 17ms 17 May 2024 502nd Alex-Huggett 🇬🇧 405 153 10ms 23 Oct 2024 502nd rollershutter 405 153 10ms 27 May 2025 506th OSYCh314 🇦🇺 403 154 12ms 16 Nov 2024 506th countlpaul-dotcom 403 154 11ms 19 Oct 2025 508th Feniske 🇫🇷 397 156 11ms 7 Oct 2022 509th RussellDash332 390 159 10ms 20 Nov 2021 509th Lwi-Sandwich 390 159 11ms 15 Nov 2023 509th EthanJantz 390 159 11ms 12 Sep 2025 509th cthierfelder 🇲🇨 390 159 18ms 14 Nov 2025 513th tik25 385 161 10ms 29 Mar 2024 514th mothcolada 🇺🇸 383 162 12ms 8 Oct 2021 514th Tagfox 383 162 17ms 16 Jul 2022 514th Zach10za 383 162 11ms 19 Jan 2024 517th pengu1n-master 380 163 11ms 11 Dec 2021 517th james-downey 380 163 11ms 16 Jul 2022 519th muser-logiccpu 🇺🇦 378 164 10ms 26 Aug 2025 520th Trunksistor 🇫🇷 376 165 14ms 26 Apr 2022 521st atazzam 🇺🇸 371 167 114ms 8 Mar 2022 521st andre-de-lorde 371 167 11ms 1 Nov 2022 521st mdnestor 371 167 10ms 7 Dec 2022 521st no53488 371 167 32ms 9 Dec 2022 525th tomh1012 369 168 13ms 3 Sep 2021 525th a-penton 369 168 10ms 22 Sep 2022 525th DrPrettyman 369 168 11ms 6 Jul 2023 528th sfuhrm 367 169 11ms 7 Dec 2021 528th tejapvk 367 169 10ms 19 Jun 2025 530th Ugoran 365 170 10ms 20 Nov 2022 530th dlutolf 365 170 10ms 30 Apr 2023 532nd zerickso 363 171 14ms 17 Mar 2024 533rd lcubelongren 356 174 15ms 14 Feb 2024 533rd osheam4 356 174 17ms 29 Apr 2024 535th rexvelde 354 175 17ms 18 Aug 2024 536th OppositeShark 346 179 11ms 19 Jul 2022 536th ridingqwerty 🇺🇸 346 179 11ms 17 Jan 2024 538th AdamMorris377 343 181 11ms 7 Sep 2024 539th j3mak 341 182 11ms 17 Jan 2024 540th marshmallowyoshi 335 185 11ms 6 Apr 2022 541st resoNathan 332 187 10ms 5 Jul 2024 542nd MLPdiscord 325 191 11ms 10 Feb 2022 542nd henrytranter 325 191 18ms 8 Apr 2022 542nd qwjhvbxi 325 191 11ms 6 Feb 2024 545th blankschyn 323 192 16ms 24 Jan 2023 546th tmanternach 320 194 11ms 23 Nov 2022 547th dgambit 312 199 17ms 21 Sep 2022 548th twocatsinatrenchcoat 295 210 18ms 12 Jul 2022 548th zt14427 295 210 11ms 28 Oct 2023 548th codewrite 🇬🇧 295 210 11ms 8 Jun 2025 551st dylanjones92 288 215 11ms 17 Jan 2024 552nd Demonarchet 286 217 10ms 1 May 2023 553rd markbyrne 274 226 16ms 24 Nov 2021 554th jstechman 267 232 182ms 24 Feb 2024 555th AbuzarN 265 234 17ms 22 Aug 2024 556th r-benson 🇬🇧 251 247 12ms 31 Jan 2023 557th Cynopolis 245 253 11ms 28 Jan 2025 558th odelo 238 261 11ms 26 Oct 2023 558th uncertaain 238 261 10ms 14 Dec 2024 560th fl3ur1nestimable 225 275 11ms 2 Apr 2022 First Prev 481–560 of 573 Next Last