The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Spelling Numbers 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 641st chartung17 522 460 417ms 1 Jan 2024 642nd markus-rekdal 521 365 21ms 15 Nov 2019 642nd MichalMarsalek 🇨🇿 521 365 13ms 8 Dec 2022 644th rambox11 518 519 13ms 19 Jul 2018 645th Irratix 🇳🇱 516 368 975ms 4 Jul 2022 646th dzhang314 515 369 21ms 13 Aug 2019 646th prplz 🇦🇺 515 369 14ms 19 Oct 2020 648th myfatemi04 511 372 14ms 9 Jan 2018 648th CedricGebistorf 511 372 14ms 13 Mar 2022 648th msbranicky 511 372 20ms 9 Aug 2023 651st btjones0 510 373 20ms 28 Dec 2020 651st AkashTandon167 510 373 13ms 24 Jan 2021 651st quimey 510 373 12ms 3 Aug 2023 651st andrewjc2000 510 373 12ms 27 Mar 2025 655th avavuvu 510 528 11ms 20 Jun 2025 656th somebody1234 508 530 12ms 12 Nov 2018 657th amazingalek 🇳🇴 507 582 416ms 20 Jan 2026 658th phdphil 503 247 216ms 28 Mar 2018 659th ryguyNelson 501 656 4ms 6 Oct 2020 660th InigoK 🇺🇸 500 380 14ms 11 Jun 2023 660th dokutan 500 380 15ms 23 Oct 2025 662nd CatsAreFluffy 499 381 21ms 14 Dec 2022 663rd MeWhenI 🇻🇦 498 203 44ms 4 Sep 2024 664th RYNO8 498 382 14ms 4 Sep 2023 664th SB-945 498 382 14ms 25 Mar 2024 666th janbehrens 🇩🇪 497 351 23ms 28 May 2021 667th jhcole 496 383 13ms 25 Apr 2020 667th SniperSmiley 🇺🇸 496 383 13ms 18 Dec 2022 667th mbittner20 496 383 14ms 27 May 2023 670th mtirado1 496 683 4ms 23 Dec 2022 671st GolfingSuccess 🇬🇷 495 347 596ms 5 Feb 2026 672nd CommandLeo 🇮🇹 495 384 21ms 27 Nov 2025 673rd hyvyys 495 553 7ms 21 Jul 2019 674th CaedenHarper 🇨🇦 494 385 34ms 3 Oct 2025 675th labster 492 360 4ms 10 May 2018 676th blaztoma 🇱🇹 492 386 20ms 4 Oct 2025 676th iliaspapa 492 386 13ms 10 Dec 2025 678th guilhem-roy 🇫🇷 491 387 18ms 7 Mar 2022 679th retrohun 490 356 17ms 29 Oct 2019 680th ZakkkkAttackkkk 🇵🇭 490 388 34ms 20 Sep 2023 680th cros107 🇦🇺 490 388 15ms 11 Jun 2025 680th retrohun 490 388 13ms 23 Jul 2025 683rd duckyluuk 🇳🇱 489 351 597ms 6 Sep 2024 684th abailey2020 🇺🇸 489 389 21ms 13 Dec 2020 684th Mabeloid 🇳🇴 489 389 15ms 4 May 2025 686th dokutan 489 550 14ms 1 Dec 2025 687th baumpilz 488 492 459ms 20 Jan 2021 688th commandz0 🇺🇸 487 390 21ms 26 Sep 2023 689th fgrosshans 🇫🇷 486 391 14ms 30 Mar 2022 689th FlorianCassayre 🇫🇷 486 391 21ms 11 Mar 2023 691st snoozingnewt 🇨🇦 485 354 561ms 20 Feb 2026 692nd jared-hughes 485 360 661ms 22 Apr 2022 693rd davecame 485 392 12ms 24 Oct 2023 693rd ndren 485 392 21ms 27 Jan 2026 695th adamnielson42 🇺🇸 485 543 29ms 11 Jan 2024 696th owenoclee 485 555 14ms 7 Oct 2017 697th chartung17 484 393 14ms 14 Jan 2024 697th Lv0Sys 🇵🇱 484 393 13ms 20 Feb 2026 699th Shanethegamer 🇺🇸 484 468 105ms 17 Dec 2024 700th HCRitter 🇩🇪 484 511 361ms 1 Nov 2023 701st c0d3-4-F00d 🇩🇪 483 610 406ms 21 Nov 2021 702nd cure-honey 🇯🇵 483 823 56ms 27 Apr 2020 703rd adamnielson42 🇺🇸 482 394 13ms 24 May 2023 704th FortuiteMan 🇫🇷 481 395 19ms 7 Dec 2025 705th DrPiranoid 480 396 14ms 10 Oct 2022 705th Troon 480 396 20ms 19 Aug 2025 707th rifatx 479 615 436ms 22 Jul 2024 708th qpwoeirut 478 398 13ms 11 Aug 2025 709th najs91 477 618 439ms 15 Oct 2024 710th HumanEquivalentUnit 477 646 20ms 28 Nov 2023 711th nephila-nacrea 🇬🇧 475 373 7ms 17 Jan 2018 712th knutae 🇳🇴 475 400 14ms 16 Nov 2021 713th TheZwierzLF 🇵🇱 475 503 41ms 21 Dec 2025 714th DialFrost 🇸🇬 475 648 25ms 4 Feb 2023 715th martinnorling 🇸🇪 474 401 14ms 2 Mar 2022 716th Fishron 473 402 15ms 18 Jun 2022 716th stefangimmillaro 473 402 13ms 10 Nov 2023 718th Indivicivet 472 403 24ms 30 Mar 2021 718th zach333 472 403 14ms 12 Jul 2024 720th pikti 472 625 445ms 21 Nov 2021 First Prev 641–720 of 1,084 Next Last
