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 801st c0d3-4-F00d 🇩🇪 415 792 5ms 4 Dec 2021 802nd mcipperly 413 422 331ms 26 Aug 2018 803rd JunkIce 412 417 688ms 17 Jan 2025 804th Omega65536 🇩🇪 411 463 15ms 10 Aug 2025 805th buddyw 410 464 22ms 9 Mar 2023 806th vroup 🇩🇰 408 660 11ms 19 Sep 2022 807th mazzegi 408 896 287ms 18 Apr 2020 808th dillon-duncando 407 467 13ms 4 Oct 2022 808th luuumine 🇫🇷 407 467 19ms 7 Nov 2025 810th hellwue 406 468 13ms 2 Sep 2024 811th Apataras 406 591 463ms 12 Aug 2025 812th albanian-laundromat 405 424 546ms 9 Aug 2025 813th robin-scragg 404 471 23ms 29 Sep 2025 814th RaBa21 🇭🇺 403 472 21ms 13 Jul 2025 815th Florian-Mt 402 473 19ms 12 Jul 2024 815th Andrey2001 402 473 13ms 1 Feb 2026 817th andre-lameirinhas 🇵🇹 401 474 13ms 27 Apr 2020 818th KatieLG 🇬🇧 398 432 609ms 15 Jan 2024 819th NanduBC 398 477 21ms 18 Apr 2021 820th trist224 🇫🇷 396 480 14ms 16 Nov 2022 820th yuchuehw 396 480 14ms 1 Jan 2024 822nd Jaydosu 394 483 24ms 26 Oct 2021 823rd luftj 393 484 13ms 3 May 2020 823rd keelimeguy 🇺🇸 393 484 20ms 8 May 2025 825th myleopard 392 485 14ms 13 Oct 2021 826th backupGitProfile 392 752 428ms 21 Nov 2021 827th jfallon1997 389 488 14ms 5 Jan 2023 827th Chara-0x 389 488 12ms 18 Sep 2025 829th vonKrafft 389 489 14ms 27 Mar 2020 829th sciencedjinn 389 489 13ms 8 Nov 2024 831st dmoa 388 490 21ms 29 May 2020 831st nullie 388 490 14ms 16 Jun 2022 831st QuincyNash 🇺🇸 388 490 14ms 16 Nov 2022 831st jamesthekee 388 490 14ms 27 Jan 2025 835th frobinsonj 388 693 13ms 6 Dec 2019 836th avila-gabriel 388 918 185ms 17 Oct 2024 837th vhoulbreque 🇫🇷 387 491 15ms 4 Dec 2025 838th r-benson 🇬🇧 386 492 13ms 31 Jan 2023 838th te-chnical 386 492 13ms 5 Jan 2026 840th ToriTheChicken 385 699 11ms 30 Jul 2020 841st stephanie-flower 384 700 13ms 23 Nov 2025 842nd XaavanDolence 384 772 187ms 7 Sep 2020 843rd mrmabs 383 496 15ms 16 Jun 2021 844th E2dgar 383 702 13ms 31 Jan 2022 845th bstrautin 382 647 333ms 26 Jul 2020 846th MeWhenI 🇻🇦 380 1,167 1,459ms 10 Feb 2025 847th muser-logiccpu 🇺🇦 379 502 13ms 16 Aug 2025 848th dokutan 378 677 1,075ms 5 Feb 2025 849th neel11235813 377 456 773ms 15 Jan 2024 850th BobDotCom 377 504 13ms 25 Mar 2022 851st kaascevich 376 360 169ms 20 Jul 2025 852nd PFischbeck 376 505 14ms 27 Sep 2018 853rd jhpaques 🇫🇷 372 511 13ms 28 Jul 2022 854th brochmann 🇸🇪 370 514 21ms 13 Aug 2023 855th elisherer 🇮🇱 370 728 12ms 8 Apr 2019 856th aksyristos 369 515 20ms 11 Jun 2023 857th ionutm82 368 516 14ms 23 May 2019 858th Mikey-Beep 🇬🇧 368 517 21ms 25 Aug 2023 859th rschwa6308 🇺🇸 367 518 13ms 8 Nov 2021 859th roguh 🇬🇹 367 518 15ms 13 Oct 2024 859th Stockoh 🇫🇷 367 518 14ms 17 Nov 2024 862nd ndren 366 470 664ms 21 Jan 2024 863rd hoodadam 366 519 19ms 18 Sep 2019 863rd michelebastione 🇮🇹 366 519 14ms 14 Jul 2021 863rd Bodo171 366 519 13ms 6 Dec 2022 866th britishben 366 520 20ms 2 Dec 2018 867th RandGuy 365 521 21ms 28 Jun 2022 868th TJK-S 364 522 14ms 13 Oct 2025 869th qwjhvbxi 363 523 13ms 5 Mar 2024 870th mrmena 🇦🇺 363 524 14ms 20 Mar 2024 871st evanrittner 362 525 14ms 11 Mar 2019 872nd dokutan 361 874 395ms 1 Dec 2025 873rd dokutan 361 963 15ms 7 Nov 2025 874th vodker1 360 528 21ms 9 Mar 2022 875th menglishca 🇨🇦 358 671 451ms 5 Aug 2021 876th jgbaldwinbrown 357 533 17ms 6 Jul 2021 877th Heathcorp 🇦🇺 356 534 19ms 29 Mar 2022 878th adoxography 355 535 22ms 21 May 2018 878th tomh1012 355 535 15ms 20 days ago 880th dyc3 355 536 24ms 26 Jul 2020 First Prev 801–880 of 1,084 Next Last
