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 bytes. 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 Bytes Time Submitted 401st MeWhenI 🇻🇦 521 360 5ms 6 Aug 2023 402nd janbehrens 🇩🇪 517 351 2,833ms 7 Jul 2023 403rd duckyluuk 🇳🇱 515 195 554ms 26 Jun 2024 404th LHLaurini 🇧🇷 514 273 2ms 30 Jun 2024 405th yzhs 🇩🇪 514 419 148ms 2 Jul 2023 406th solisolu 513 206 10ms 20 days ago 407th OllieBoyne 🇬🇧 508 208 10ms 4 Feb 2023 408th snoozingnewt 🇨🇦 507 282 101ms 27 Sep 2025 409th shaunjc 506 249 5ms 17 Feb 2023 410th KatieLG 🇬🇧 505 199 550ms 19 Apr 2025 411th MeWhenI 🇻🇦 504 380 47ms 4 Sep 2024 412th klixel 🇨🇦 503 210 11ms 18 Jul 2025 412th InigoK 🇺🇸 503 210 18ms 6 Sep 2025 412th Matter1024 🇮🇳 503 210 10ms 16 Jan 2026 415th MeWhenI 🇻🇦 502 404 45ms 29 Apr 2025 416th codewrite 🇬🇧 501 211 10ms 27 Jun 2025 417th knutae 🇳🇴 499 212 18ms 13 Nov 2023 418th CaedenHarper 🇨🇦 498 172 899ms 10 Feb 2026 419th Shanethegamer 🇺🇸 497 118 8ms 7 Feb 2023 420th elgan65536 🇺🇸 496 213 10ms 9 Nov 2024 420th sciencejiho 496 213 10ms 11 Feb 2025 422nd yzhs 🇩🇪 494 214 10ms 22 Jun 2023 422nd CutSandstone 494 214 11ms 7 Jul 2024 422nd croc54 494 214 11ms 30 Jan 2025 425th inverseLorentz 🇦🇺 492 215 11ms 19 Oct 2023 426th MeWhenI 🇻🇦 491 429 37ms 6 Jun 2023 427th guilhem-roy 🇫🇷 490 216 11ms 6 Feb 2023 428th quimey 487 217 12ms 16 Mar 2023 428th BREMAUCY 🇫🇷 487 217 11ms 19 Mar 2024 428th albanian-laundromat 487 217 13ms 14 Sep 2025 431st tigerdan2 🇩🇪 483 332 495ms 30 Nov 2025 431st h3ra993huskp 🇯🇵 483 332 471ms 30 Nov 2025 433rd albanian-laundromat 479 210 585ms 4 Aug 2025 434th galloj 🇨🇿 476 222 11ms 1 Feb 2023 434th TobyBoyne 🇬🇧 476 222 12ms 2 Feb 2023 434th Bulmenisaurus 476 222 11ms 8 Sep 2025 437th aksyristos 474 223 11ms 6 Feb 2023 437th Lv0Sys 🇵🇱 474 223 11ms 25 Feb 2026 439th aksyristos 471 385 3,076ms 16 Feb 2023 440th rifatx 471 429 300ms 10 Sep 2024 441st coreynash 469 233 11ms 15 Feb 2024 442nd codewrite 🇬🇧 469 370 415ms 18 Jan 2026 443rd KatieLG 🇬🇧 466 225 1,335ms 23 Jun 2024 444th jmerle 🇳🇱 466 227 17ms 1 Feb 2023 445th oceko 466 389 2,935ms 13 Feb 2024 446th trist224 🇫🇷 462 229 11ms 12 Aug 2024 446th Program-Pi 462 229 17ms 8 days ago 448th Phil-RGOMEGA 462 282 2ms 30 Aug 2023 449th suwat513 460 230 10ms 16 Jun 2023 450th jatloe 456 232 10ms 20 Sep 2024 451st MeWhenI 🇻🇦 454 129 31ms 16 Apr 2023 452nd msbranicky 450 235 21ms 27 Aug 2023 453rd dokutan 445 239 280ms 9 Oct 2024 454th janbehrens 🇩🇪 444 316 2ms 7 Jul 2023 455th arctouch-cristiannevianna 444 391 421ms 3 Feb 2023 456th Natanaelel 🇸🇪 444 485 156ms 11 May 2025 457th DialFrost 🇸🇬 441 241 593ms 15 Apr 2025 458th CatsAreFluffy 440 319 2ms 11 Feb 2023 459th luuumine 🇫🇷 437 242 11ms 24 Nov 2025 460th wuduculfre 435 243 12ms 22 Jul 2025 461st albanian-laundromat 433 198 1,384ms 22 Nov 2025 462nd RDShah 432 245 13ms 3 Feb 2023 463rd qwjhvbxi 430 246 11ms 24 Feb 2024 464th MeWhenI 🇻🇦 429 289 40ms 15 Aug 2024 465th msbranicky 428 235 500ms 16 Jan 2024 466th retrohun 428 247 10ms 11 Mar 2023 466th AtengChen 428 247 9ms 8 Aug 2024 468th JGDoerrer 428 551 230ms 28 Mar 2023 469th Kokusui 🇯🇵 423 298 5ms 26 Jul 2024 470th janbehrens 🇩🇪 423 849 29ms 2 Aug 2023 471st CedricGebistorf 421 251 11ms 5 May 2023 472nd bac0id 417 435 3,029ms 11 Jan 2025 473rd fgrosshans 🇫🇷 416 254 10ms 5 May 2023 474th celiendonze 🇨🇭 413 256 10ms 25 May 2023 474th nooberitess 413 256 11ms 8 Apr 2025 476th tomh1012 410 424 454ms 23 days ago 477th driri85 408 259 11ms 15 Dec 2025 478th blaztoma 🇱🇹 407 144 8ms 17 Dec 2025 479th LostSyntax21 🇬🇧 407 260 10ms 27 Nov 2024 480th kejcao 🇨🇦 404 533 150ms 2 Aug 2024 First Prev 401–480 of 564 Next Last