The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. 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 janbehrens 🇩🇪 443 316 2ms 7 Jul 2023 402nd CatsAreFluffy 439 319 2ms 11 Feb 2023 403rd robin-scragg 434 179 11ms 10 Oct 2025 404th m-tkach 🇺🇦 431 180 18ms 4 Feb 2023 405th MeWhenI 🇻🇦 431 415 3ms 26 Aug 2023 406th IISResetMe 430 195 313ms 27 Nov 2025 407th KatieLG 🇬🇧 429 129 37ms 2 Oct 2025 408th MeWhenI 🇻🇦 428 289 40ms 15 Aug 2024 409th JGDoerrer 428 551 230ms 28 Mar 2023 410th Kokusui 🇯🇵 422 298 5ms 26 Jul 2024 411th janbehrens 🇩🇪 422 849 29ms 2 Aug 2023 412th NDR0216 🇹🇼 419 185 10ms 15 Feb 2023 413th dokutan 417 196 2,065ms 9 Apr 2024 414th bac0id 416 435 3,029ms 11 Jan 2025 415th CaedenHarper 🇨🇦 415 180 472ms 8 hours ago 416th xsot 🇸🇬 415 187 11ms 11 Mar 2023 417th qpwoeirut 411 189 12ms 4 Oct 2025 418th coreynash 411 233 11ms 15 Feb 2024 419th Phil-RGOMEGA 410 282 2ms 30 Aug 2023 420th tomh1012 409 424 454ms 22 days ago 421st janbehrens 🇩🇪 406 191 11ms 22 Jun 2023 422nd blaztoma 🇱🇹 405 144 8ms 17 Dec 2025 423rd CaedenHarper 🇨🇦 404 192 28ms 8 hours ago 424th kejcao 🇨🇦 404 533 150ms 2 Aug 2024 425th GolfingSuccess 🇬🇷 402 186 537ms 20 Jan 2024 426th stefangimmillaro 402 193 11ms 29 May 2023 427th plcc0 400 194 12ms 13 May 2025 427th YAJUE114514 400 194 11ms 16 Aug 2025 429th GolfingSuccess 🇬🇷 396 196 11ms 1 Feb 2023 429th stertooy 🇧🇪 396 196 11ms 18 Jun 2024 429th redweasel 396 196 19ms 24 Jul 2025 429th FortuiteMan 🇫🇷 396 196 10ms 27 Nov 2025 433rd MeWhenI 🇻🇦 395 259 14ms 22 Nov 2023 434th inventshah 394 197 11ms 1 Feb 2023 434th davecame 394 197 10ms 10 Oct 2023 434th andrewjc2000 394 197 11ms 4 Jul 2025 434th shelerr 394 197 11ms 21 Aug 2025 438th fkantelberg 392 198 11ms 31 Jul 2023 438th ssbhatt4321 392 198 11ms 14 Oct 2023 438th Sp3000 🇦🇺 392 198 11ms 20 Nov 2023 441st MeWhenI 🇻🇦 391 380 47ms 4 Sep 2024 442nd AlephSquirrel 389 192 518ms 21 Jan 2024 443rd Alex-x90 🇺🇸 388 200 11ms 1 Feb 2023 443rd ahmetdemirag 🇨🇾 388 200 11ms 15 Dec 2024 443rd StefanHabel 🇨🇦 388 200 10ms 20 days ago 446th msbranicky 388 519 299ms 31 Aug 2023 447th happppya 386 201 10ms 10 days ago 447th zgialor-lab 386 201 11ms 3 days ago 449th AlephSquirrel 384 202 18ms 1 Feb 2023 450th jared-hughes 382 203 10ms 17 Feb 2023 450th neihousaigaai 382 203 10ms 13 Feb 2024 450th snydej 382 203 11ms 21 Nov 2024 453rd snoozingnewt 🇨🇦 379 242 3ms 5 Sep 2025 454th solisolu 377 206 10ms 19 days ago 455th OllieBoyne 🇬🇧 373 208 10ms 4 Feb 2023 456th MeWhenI 🇻🇦 372 470 240ms 22 Aug 2023 457th MeWhenI 🇻🇦 372 522 1,458ms 26 Aug 2023 458th klixel 🇨🇦 370 210 11ms 18 Jul 2025 458th InigoK 🇺🇸 370 210 18ms 6 Sep 2025 458th Matter1024 🇮🇳 370 210 10ms 16 Jan 2026 461st codewrite 🇬🇧 368 211 10ms 27 Jun 2025 462nd knutae 🇳🇴 366 212 18ms 13 Nov 2023 463rd sciencejiho 364 213 10ms 11 Feb 2025 464th CutSandstone 363 214 11ms 7 Jul 2024 464th croc54 363 214 11ms 30 Jan 2025 466th inverseLorentz 🇦🇺 361 215 11ms 19 Oct 2023 467th Schmitt-Very-Cool 360 445 513ms 3 Oct 2025 468th guilhem-roy 🇫🇷 359 216 11ms 6 Feb 2023 469th BREMAUCY 🇫🇷 358 217 11ms 19 Mar 2024 470th galloj 🇨🇿 350 222 11ms 1 Feb 2023 470th TobyBoyne 🇬🇧 350 222 12ms 2 Feb 2023 470th Bulmenisaurus 350 222 11ms 8 Sep 2025 473rd MeWhenI 🇻🇦 349 144 2,189ms 11 Apr 2023 474th aksyristos 348 223 11ms 6 Feb 2023 474th Lv0Sys 🇵🇱 348 223 11ms 25 Feb 2026 476th madex 🇩🇪 348 402 2ms 26 Feb 2024 477th CatsAreFluffy 347 276 12ms 1 Feb 2023 478th CaedenHarper 🇨🇦 346 1,118 1,682ms 12 Oct 2025 479th DialFrost 🇸🇬 342 239 593ms 15 Apr 2025 480th MeWhenI 🇻🇦 341 360 5ms 6 Aug 2023 First Prev 401–480 of 560 Next Last