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?
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 arctouch-cristiannevianna 444 391 421ms 3 Feb 2023 402nd Natanaelel 🇸🇪 444 485 156ms 11 May 2025 403rd janbehrens 🇩🇪 443 316 2ms 7 Jul 2023 404th CatsAreFluffy 439 319 2ms 11 Feb 2023 405th robin-scragg 434 179 11ms 10 Oct 2025 406th m-tkach 🇺🇦 431 180 18ms 4 Feb 2023 407th MeWhenI 🇻🇦 431 415 3ms 26 Aug 2023 408th IISResetMe 430 195 313ms 27 Nov 2025 409th KatieLG 🇬🇧 429 129 37ms 2 Oct 2025 410th MeWhenI 🇻🇦 428 289 40ms 15 Aug 2024 411th JGDoerrer 428 551 230ms 28 Mar 2023 412th Kokusui 🇯🇵 422 298 5ms 26 Jul 2024 413th janbehrens 🇩🇪 422 849 29ms 2 Aug 2023 414th NDR0216 🇹🇼 419 185 10ms 15 Feb 2023 415th dokutan 417 196 2,065ms 9 Apr 2024 416th bac0id 416 435 3,029ms 11 Jan 2025 417th CaedenHarper 🇨🇦 415 180 472ms 40 hours ago 418th xsot 🇸🇬 415 187 11ms 11 Mar 2023 419th qpwoeirut 411 189 12ms 4 Oct 2025 420th coreynash 411 233 11ms 15 Feb 2024 421st Phil-RGOMEGA 410 282 2ms 30 Aug 2023 422nd tomh1012 409 424 454ms 24 days ago 423rd janbehrens 🇩🇪 406 191 11ms 22 Jun 2023 423rd madex 🇩🇪 406 191 11ms 79 mins ago 425th blaztoma 🇱🇹 405 144 8ms 17 Dec 2025 426th CaedenHarper 🇨🇦 404 192 28ms 40 hours ago 427th kejcao 🇨🇦 404 533 150ms 2 Aug 2024 428th GolfingSuccess 🇬🇷 402 186 537ms 20 Jan 2024 429th stefangimmillaro 402 193 11ms 29 May 2023 430th plcc0 400 194 12ms 13 May 2025 430th YAJUE114514 400 194 11ms 16 Aug 2025 432nd GolfingSuccess 🇬🇷 396 196 11ms 1 Feb 2023 432nd stertooy 🇧🇪 396 196 11ms 18 Jun 2024 432nd redweasel 396 196 19ms 24 Jul 2025 432nd FortuiteMan 🇫🇷 396 196 10ms 27 Nov 2025 436th MeWhenI 🇻🇦 395 259 14ms 22 Nov 2023 437th inventshah 394 197 11ms 1 Feb 2023 437th davecame 394 197 10ms 10 Oct 2023 437th andrewjc2000 394 197 11ms 4 Jul 2025 437th shelerr 394 197 11ms 21 Aug 2025 441st fkantelberg 392 198 11ms 31 Jul 2023 441st ssbhatt4321 392 198 11ms 14 Oct 2023 441st Sp3000 🇦🇺 392 198 11ms 20 Nov 2023 444th MeWhenI 🇻🇦 391 380 47ms 4 Sep 2024 445th madex 🇩🇪 390 142 37ms 76 mins ago 446th AlephSquirrel 389 192 518ms 21 Jan 2024 447th Alex-x90 🇺🇸 388 200 11ms 1 Feb 2023 447th ahmetdemirag 🇨🇾 388 200 11ms 15 Dec 2024 447th StefanHabel 🇨🇦 388 200 10ms 21 days ago 450th msbranicky 388 519 299ms 31 Aug 2023 451st happppya 386 201 10ms 11 days ago 451st zgialor-lab 386 201 11ms 4 days ago 453rd AlephSquirrel 384 202 18ms 1 Feb 2023 454th jared-hughes 382 203 10ms 17 Feb 2023 454th neihousaigaai 382 203 10ms 13 Feb 2024 454th snydej 382 203 11ms 21 Nov 2024 457th snoozingnewt 🇨🇦 379 242 3ms 5 Sep 2025 458th solisolu 377 206 10ms 21 days ago 459th OllieBoyne 🇬🇧 373 208 10ms 4 Feb 2023 460th MeWhenI 🇻🇦 372 470 240ms 22 Aug 2023 461st MeWhenI 🇻🇦 372 522 1,458ms 26 Aug 2023 462nd klixel 🇨🇦 370 210 11ms 18 Jul 2025 462nd InigoK 🇺🇸 370 210 18ms 6 Sep 2025 462nd Matter1024 🇮🇳 370 210 10ms 16 Jan 2026 465th codewrite 🇬🇧 368 211 10ms 27 Jun 2025 466th knutae 🇳🇴 366 212 18ms 13 Nov 2023 467th sciencejiho 364 213 10ms 11 Feb 2025 468th CutSandstone 363 214 11ms 7 Jul 2024 468th croc54 363 214 11ms 30 Jan 2025 470th inverseLorentz 🇦🇺 361 215 11ms 19 Oct 2023 471st Schmitt-Very-Cool 360 445 513ms 3 Oct 2025 472nd guilhem-roy 🇫🇷 359 216 11ms 6 Feb 2023 473rd BREMAUCY 🇫🇷 358 217 11ms 19 Mar 2024 474th galloj 🇨🇿 350 222 11ms 1 Feb 2023 474th TobyBoyne 🇬🇧 350 222 12ms 2 Feb 2023 474th Bulmenisaurus 350 222 11ms 8 Sep 2025 477th MeWhenI 🇻🇦 349 144 2,189ms 11 Apr 2023 478th aksyristos 348 223 11ms 6 Feb 2023 478th Lv0Sys 🇵🇱 348 223 11ms 25 Feb 2026 480th CatsAreFluffy 347 276 12ms 1 Feb 2023 First Prev 401–480 of 563 Next Last