The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 27 hours. Why not try and solve them ahead of time?
Repeating Decimals in all languages 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 dokutan 445 168 385ms 14 Feb 2026 402nd arctouch-cristiannevianna 444 391 421ms 3 Feb 2023 403rd Natanaelel 🇸🇪 444 485 156ms 11 May 2025 404th janbehrens 🇩🇪 443 316 2ms 7 Jul 2023 405th CatsAreFluffy 439 319 2ms 11 Feb 2023 406th robin-scragg 434 179 11ms 10 Oct 2025 407th m-tkach 🇺🇦 431 180 18ms 4 Feb 2023 408th MeWhenI 🇻🇦 431 415 3ms 26 Aug 2023 409th IISResetMe 430 195 313ms 27 Nov 2025 410th KatieLG 🇬🇧 429 129 37ms 2 Oct 2025 411th MeWhenI 🇻🇦 428 289 40ms 15 Aug 2024 412th JGDoerrer 428 551 230ms 28 Mar 2023 413th Kokusui 🇯🇵 422 298 5ms 26 Jul 2024 414th janbehrens 🇩🇪 422 849 29ms 2 Aug 2023 415th NDR0216 🇹🇼 419 185 10ms 15 Feb 2023 416th dokutan 417 196 2,065ms 9 Apr 2024 417th bac0id 416 435 3,029ms 11 Jan 2025 418th CaedenHarper 🇨🇦 415 180 472ms 2 days ago 419th xsot 🇸🇬 415 187 11ms 11 Mar 2023 420th qpwoeirut 411 189 12ms 4 Oct 2025 421st coreynash 411 233 11ms 15 Feb 2024 422nd Phil-RGOMEGA 410 282 2ms 30 Aug 2023 423rd tomh1012 409 424 454ms 25 days ago 424th janbehrens 🇩🇪 406 191 11ms 22 Jun 2023 424th madex 🇩🇪 406 191 11ms 24 hours ago 426th blaztoma 🇱🇹 405 144 9ms 17 Dec 2025 427th CaedenHarper 🇨🇦 404 192 28ms 2 days ago 428th kejcao 🇨🇦 404 533 150ms 2 Aug 2024 429th GolfingSuccess 🇬🇷 402 186 537ms 20 Jan 2024 430th stefangimmillaro 402 193 11ms 29 May 2023 431st plcc0 400 194 12ms 13 May 2025 431st YAJUE114514 400 194 11ms 16 Aug 2025 433rd GolfingSuccess 🇬🇷 396 196 11ms 1 Feb 2023 433rd stertooy 🇧🇪 396 196 11ms 18 Jun 2024 433rd redweasel 396 196 19ms 24 Jul 2025 433rd FortuiteMan 🇫🇷 396 196 10ms 27 Nov 2025 437th MeWhenI 🇻🇦 395 259 14ms 22 Nov 2023 438th inventshah 394 197 11ms 1 Feb 2023 438th davecame 394 197 10ms 10 Oct 2023 438th andrewjc2000 394 197 11ms 4 Jul 2025 438th shelerr 394 197 11ms 21 Aug 2025 442nd fkantelberg 392 198 11ms 31 Jul 2023 442nd ssbhatt4321 392 198 11ms 14 Oct 2023 442nd Sp3000 🇦🇺 392 198 11ms 20 Nov 2023 445th MeWhenI 🇻🇦 391 380 47ms 4 Sep 2024 446th madex 🇩🇪 390 142 37ms 24 hours ago 447th AlephSquirrel 389 192 518ms 21 Jan 2024 448th Alex-x90 🇺🇸 388 200 11ms 1 Feb 2023 448th ahmetdemirag 🇨🇾 388 200 11ms 15 Dec 2024 448th StefanHabel 🇨🇦 388 200 10ms 22 days ago 451st msbranicky 388 519 299ms 31 Aug 2023 452nd happppya 386 201 10ms 12 days ago 452nd zgialor-lab 386 201 11ms 5 days ago 454th AlephSquirrel 384 202 18ms 1 Feb 2023 455th jared-hughes 382 203 10ms 17 Feb 2023 455th neihousaigaai 382 203 10ms 13 Feb 2024 455th snydej 382 203 11ms 21 Nov 2024 455th solisolu 382 203 11ms 4 hours ago 459th snoozingnewt 🇨🇦 379 242 3ms 5 Sep 2025 460th OllieBoyne 🇬🇧 373 208 10ms 4 Feb 2023 461st MeWhenI 🇻🇦 372 470 240ms 22 Aug 2023 462nd MeWhenI 🇻🇦 372 522 1,458ms 26 Aug 2023 463rd klixel 🇨🇦 370 210 11ms 18 Jul 2025 463rd InigoK 🇺🇸 370 210 18ms 6 Sep 2025 463rd Matter1024 🇮🇳 370 210 10ms 16 Jan 2026 466th codewrite 🇬🇧 368 211 10ms 27 Jun 2025 467th knutae 🇳🇴 366 212 18ms 13 Nov 2023 468th sciencejiho 364 213 10ms 11 Feb 2025 469th CutSandstone 363 214 11ms 7 Jul 2024 469th croc54 363 214 11ms 30 Jan 2025 471st inverseLorentz 🇦🇺 361 215 11ms 19 Oct 2023 472nd Schmitt-Very-Cool 360 445 513ms 3 Oct 2025 473rd guilhem-roy 🇫🇷 359 216 11ms 6 Feb 2023 474th BREMAUCY 🇫🇷 358 217 11ms 19 Mar 2024 475th galloj 🇨🇿 350 222 11ms 1 Feb 2023 475th TobyBoyne 🇬🇧 350 222 12ms 2 Feb 2023 475th Bulmenisaurus 350 222 11ms 8 Sep 2025 478th MeWhenI 🇻🇦 349 144 2,189ms 11 Apr 2023 479th aksyristos 348 223 11ms 6 Feb 2023 479th Lv0Sys 🇵🇱 348 223 11ms 25 Feb 2026 First Prev 401–480 of 564 Next Last