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 321st yzhs 🇩🇪 575 135 10ms 22 Jun 2023 322nd Salutations45 573 160 2ms 25 Jan 2025 323rd CaedenHarper 🇨🇦 570 168 10ms 6 Nov 2025 324th jared-hughes 569 246 2ms 7 Sep 2023 325th MeWhenI 🇻🇦 568 286 410ms 9 Mar 2023 326th itsh01 567 169 9ms 21 Aug 2023 327th nwellnhof 🇩🇪 566 137 17ms 16 Jul 2023 328th FortuiteMan 🇫🇷 564 78 155ms 10 Oct 2024 329th Waffle3z 564 205 2ms 12 Sep 2023 330th stefangimmillaro 561 359 306ms 27 Oct 2023 331st jmerle 🇳🇱 558 139 17ms 1 Feb 2023 332nd Argeento 🇵🇱 557 172 11ms 27 Aug 2023 333rd kmathis22 556 288 548ms 8 Dec 2025 334th JDiLenarda 🇫🇷 556 312 422ms 23 Nov 2023 335th MeWhenI 🇻🇦 554 227 10ms 28 May 2023 336th jatloe 550 141 11ms 20 Sep 2024 337th Matter1024 🇮🇳 549 245 2,937ms 18 Jan 2026 338th stefangimmillaro 548 292 486ms 6 Oct 2025 339th mousetail 🇳🇱 548 430 281ms 12 Apr 2024 340th voytxt 🇨🇿 547 175 11ms 20 Apr 2024 341st SirBogman 🇺🇸 546 137 470ms 16 Jan 2024 342nd MeWhenI 🇻🇦 546 168 2ms 9 Mar 2023 343rd weliveinhell 🇭🇹 545 257 2ms 31 Dec 2023 344th Shanethegamer 🇺🇸 543 222 84ms 30 May 2025 345th ryyyn 🇺🇸 539 144 16ms 20 Oct 2025 346th AlephSquirrel 539 269 9ms 19 Jan 2025 347th MeWhenI 🇻🇦 537 180 851ms 24 Jun 2024 348th MeWhenI 🇻🇦 534 262 2ms 21 Apr 2023 349th luuumine 🇫🇷 532 146 11ms 24 Nov 2025 350th CatsAreFluffy 530 342 74ms 11 Feb 2023 351st Noam527 528 265 2ms 4 Apr 2024 352nd Looney32768 528 303 459ms 3 Feb 2023 353rd tatzyr 🇯🇵 527 105 39ms 28 Jul 2025 354th acollett89 526 182 12ms 7 Aug 2025 355th Shanethegamer 🇺🇸 526 220 2ms 10 Feb 2023 356th MeWhenI 🇻🇦 525 272 101ms 6 May 2023 357th stefangimmillaro 525 396 733ms 9 Nov 2023 358th Yax42 🇫🇷 523 183 10ms 28 hours ago 359th ovs-code 🇩🇪 521 158 158ms 17 Apr 2025 360th janbehrens 🇩🇪 516 351 2,833ms 7 Jul 2023 361st boboquack 514 151 17ms 27 Nov 2023 362nd yzhs 🇩🇪 514 419 148ms 2 Jul 2023 363rd LHLaurini 🇧🇷 513 273 2ms 30 Jun 2024 364th lynn 511 152 16ms 3 Feb 2023 365th MeWhenI 🇻🇦 511 160 275ms 15 Feb 2023 366th NickTheEASDude 🇺🇸 505 229 2ms 22 Aug 2024 367th shaunjc 505 249 5ms 17 Feb 2023 368th trinityy-7 504 190 11ms 17 Mar 2024 369th Program-Pi 501 191 13ms 9 days ago 370th MeWhenI 🇻🇦 501 404 45ms 29 Apr 2025 371st blaztoma 🇱🇹 494 112 38ms 17 Dec 2025 372nd Shanethegamer 🇺🇸 494 118 8ms 7 Feb 2023 373rd MeWhenI 🇻🇦 490 429 37ms 6 Jun 2023 374th zakariamouhid 486 197 12ms 4 Jun 2023 375th wh3n3v3r 🇨🇿 485 160 10ms 13 Nov 2024 376th tigerdan2 🇩🇪 482 332 495ms 30 Nov 2025 376th h3ra993huskp 🇯🇵 482 332 471ms 30 Nov 2025 378th RaBa21 🇭🇺 479 162 10ms 18 Jul 2025 379th janbehrens 🇩🇪 474 202 10ms 7 Jul 2023 379th XenThe 🇬🇧 474 202 11ms 26 Jul 2025 381st MeWhenI 🇻🇦 471 175 155ms 3 Aug 2024 382nd commandz0 🇺🇸 470 159 494ms 1 Sep 2025 383rd lelbal 470 165 16ms 15 Aug 2024 384th iczelia 🇩🇪 470 204 11ms 25 Oct 2025 385th aksyristos 470 385 3,076ms 16 Feb 2023 386th rifatx 470 429 300ms 10 Sep 2024 387th codewrite 🇬🇧 469 370 415ms 18 Jan 2026 388th RobertHoeh 468 247 2ms 2 May 2024 389th oceko 466 389 2,935ms 13 Feb 2024 390th ItsMeNoobieboy 465 167 11ms 19 Feb 2023 390th FlorianCassayre 🇫🇷 465 167 349ms 18 Sep 2023 392nd KatieLG 🇬🇧 464 225 1,335ms 23 Jun 2024 393rd CaedenHarper 🇨🇦 462 109 58ms 39 mins ago 394th yuchuehw 459 169 12ms 13 Feb 2024 394th dokutan 459 169 11ms 24 Oct 2025 396th alexsave 456 210 12ms 16 Jan 2026 397th MeWhenI 🇻🇦 452 129 31ms 16 Apr 2023 398th rucin93 🇵🇱 448 184 164ms 31 Oct 2024 399th janbehrens 🇩🇪 446 183 355ms 22 Jun 2023 400th dokutan 445 168 385ms 14 Feb 2026 First Prev 321–400 of 563 Next Last