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?
𝑒 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 321st ritwinnarra 453 106 13ms 11 Jun 2023 321st davidsaltacc 453 106 34ms 16 Nov 2023 323rd The3gs 449 107 13ms 28 Aug 2020 324th IshanPanpaliya 440 109 32ms 1 Apr 2022 325th dzshn 432 111 16ms 18 Aug 2021 326th Serj-0 429 112 11ms 16 Aug 2020 326th Maltysen 429 112 22ms 25 Sep 2020 326th andre-lameirinhas 🇵🇹 429 112 21ms 27 Apr 2021 326th RandGuy 429 112 12ms 25 Jan 2024 330th Andre3582 417 115 20ms 12 Apr 2021 331st TaserTheFox 🇺🇸 414 116 56ms 7 Apr 2023 332nd amollberg 🇸🇪 410 117 52ms 28 Jan 2022 332nd martinnorling 🇸🇪 410 117 18ms 29 Mar 2022 332nd lucky-lilypad 410 117 238ms 17 May 2022 332nd dillon-duncando 410 117 15ms 4 Oct 2022 336th boxjelly 407 118 22ms 12 Feb 2021 336th ellis-rix 407 118 23ms 11 Mar 2022 336th DABANANAMAN120 407 118 60ms 26 Jun 2025 339th Ripick 400 120 187ms 8 May 2023 339th Code-Coder-coder 400 120 54ms 13 Oct 2025 341st Starwort 🇬🇧 397 121 16ms 27 May 2019 341st artieleach 397 121 17ms 7 Feb 2021 341st michelebastione 🇮🇹 397 121 16ms 17 Jan 2022 341st mishak-sys 397 121 12ms 18 Feb 2025 345th xyangst 393 122 25ms 12 Oct 2024 345th greentruff 393 122 137ms 14 May 2025 347th Pena86 390 123 47ms 1 Mar 2021 347th rollershutter 390 123 17ms 29 May 2024 347th Mikey-Beep 🇬🇧 390 123 57ms 2 Sep 2024 347th Miles-1000 🇬🇧 390 123 60ms 7 Oct 2025 351st Indivicivet 384 125 54ms 25 Mar 2021 351st ValentinCassayre 384 125 57ms 8 Oct 2022 353rd PFischbeck 381 126 19ms 17 Nov 2017 354th dachrillz 372 129 38ms 14 Oct 2018 354th alangodfrey 372 129 115ms 31 Jan 2019 356th epic-programmer-guy 369 130 154ms 17 Dec 2023 357th xkacer 🇨🇿 366 131 31ms 25 Jan 2021 358th itiievskyi 🇺🇦 358 134 47ms 6 Aug 2020 358th JKfromHMS 358 134 23ms 8 Jun 2024 360th muser-logiccpu 🇺🇦 356 135 355ms 9 Aug 2025 360th TJK-S 356 135 58ms 23 Oct 2025 362nd Skwerl23 353 136 18ms 5 Feb 2023 363rd jaydity 350 137 47ms 10 Feb 2024 364th twocatsinatrenchcoat 345 139 57ms 1 Dec 2022 364th OSYCh314 🇦🇺 345 139 54ms 17 Feb 2026 366th mokymok 🇺🇸 343 140 27ms 18 Nov 2021 366th esnethen 343 140 33ms 21 Feb 2023 368th joonaspu 340 141 55ms 3 Jun 2023 368th codingisgreatbutiamnot 340 141 56ms 28 Jul 2024 370th tomc 331 145 21ms 29 Aug 2023 371st Educorreia932 329 146 232ms 11 Apr 2021 371st firegene 🇮🇪 329 146 24ms 6 Feb 2024 373rd rustykitty 🇺🇸 324 148 16ms 28 Oct 2025 374th Secozzi 320 150 15ms 20 Oct 2020 375th Oussama-Ben-Nasr 316 152 48ms 14 Nov 2022 376th tetraxile 308 156 59ms 3 Oct 2021 377th not-a-pokemon 306 157 2,930ms 18 Feb 2025 378th ozewski 300 160 15ms 23 May 2019 379th k3w1k0d3r 296 162 226ms 27 Jun 2022 380th pecholsjones 294 163 23ms 12 Dec 2021 381st tzlils 286 168 58ms 25 Mar 2023 382nd zuparnowa 271 177 16ms 29 Jan 2019 382nd henrytranter 271 177 16ms 20 Sep 2019 384th ssilwa 270 178 15ms 14 Jan 2018 385th shibacho 🇯🇵 253 190 102ms 25 Mar 2022 386th Mabeloid 🇳🇴 230 209 10ms 5 Sep 2024 387th tik25 229 210 20ms 28 Mar 2024 388th SURAJMITTAL 215 223 32ms 20 Dec 2024 389th plainoldcheese 🇦🇶 206 233 57ms 20 Jan 2024 390th j-Ewan 204 235 11ms 10 Mar 2022 391st LiamKrenn 184 261 36ms 22 Jul 2022 392nd AxlJeff 181 265 18ms 8 Dec 2025 393rd garrisonhh 158 304 9ms 22 Nov 2020 394th jeff-at-tamer-dot-codes 🇺🇸 157 305 17ms 9 Apr 2023 395th kkoenig 150 321 23ms 22 Dec 2023 396th ridingqwerty 🇺🇸 146 328 16ms 13 Dec 2023 397th yuchuehw 137 351 20ms 1 Jan 2024 398th Jacob385 124 386 16ms 17 Apr 2024 399th 1231234md5 🇨🇳 122 395 17ms 14 Dec 2023 400th AidanWalter 119 405 24ms 3 Jan 2025 First Prev 321–400 of 474 Next Last
