The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 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 400th prestosilver 🇺🇸 730 404 430ms 27 hours ago 402nd MeWhenI 🇻🇦 729 404 105ms 12 Dec 2022 403rd Andriamanitra 🇫🇮 728 411 476ms 25 Aug 2022 404th Indivicivet 727 66 14ms 30 Mar 2021 404th KatieLG 🇬🇧 727 66 14ms 25 May 2021 406th prplz 🇦🇺 727 452 3ms 11 Oct 2019 407th iznax 726 406 397ms 21 Nov 2021 408th MeWhenI 🇻🇦 725 237 618ms 13 Jul 2024 409th gastropner 724 454 4ms 16 Jul 2025 410th iczelia 🇩🇪 723 372 11ms 19 Oct 2025 411th JOrE20 723 559 136ms 15 Dec 2025 412th MeWhenI 🇻🇦 722 336 400ms 14 Feb 2023 413th albanian-laundromat 720 434 4ms 26 Nov 2025 414th CaedenHarper 🇨🇦 719 374 13ms 29 Aug 2025 415th sean-niemann 🇺🇸 719 410 463ms 20 Oct 2024 416th timvermeulen 719 496 208ms 5 Jan 2020 417th proton 🇩🇪 718 333 36ms 13 Jun 2020 418th orthoplex 🇨🇽 717 265 26ms 9 Oct 2022 419th albanian-laundromat 717 356 1,399ms 4 Nov 2025 420th msbranicky 717 436 3ms 10 Aug 2023 421st CatsAreFluffy 717 484 75ms 14 Dec 2022 421st tailorspy 717 484 1,420ms 10 Mar 2024 423rd KatieLG 🇬🇧 716 412 408ms 21 Nov 2021 424th emgordon154 715 621 1,490ms 4 Oct 2025 425th rumblesan 712 378 12ms 7 Dec 2018 425th voytxt 🇨🇿 712 378 12ms 19 Jun 2023 427th Yewzir 🇧🇪 712 513 302ms 5 Jan 2024 428th CatsAreFluffy 711 462 3ms 1 Jan 2023 429th jacobly0 🇺🇸 711 637 1,786ms 22 Apr 2024 430th cywong-amino 🇭🇰 710 379 13ms 7 Oct 2020 431st MeWhenI 🇻🇦 710 507 35ms 7 Jun 2023 432nd SirBogman 🇺🇸 709 268 14ms 7 Jun 2022 433rd ian-h-chamberlain 🇺🇸 709 503 206ms 3 Nov 2025 434th JOrE20 709 564 64ms 18 Feb 2026 435th dokutan 708 478 3ms 10 Apr 2025 436th JGDoerrer 707 491 465ms 17 Jan 2022 437th Betuaredead 706 68 9ms 12 Jan 2023 438th rak1507 🇬🇧 705 256 3ms 9 May 2022 439th helbling 🇨🇭 704 382 12ms 1 Jul 2024 440th janbehrens 🇩🇪 704 493 2,999ms 20 Nov 2022 441st tatzyr 🇯🇵 703 340 37ms 22 Mar 2025 442nd m-tkach 🇺🇦 701 271 36ms 14 Feb 2023 443rd SirBogman 🇺🇸 701 341 36ms 10 Jan 2024 444th dokutan 701 364 1,356ms 23 Oct 2025 445th Bubbler-4 700 258 3ms 12 Jan 2022 446th arcpolaris 700 421 450ms 20 Nov 2024 447th jared-hughes 700 472 35ms 8 Jul 2024 448th jerrandolph 700 522 294ms 21 Oct 2023 449th stefangimmillaro 699 342 58ms 4 Oct 2022 450th dokutan 699 452 2,705ms 26 Oct 2024 451st emgordon154 697 444 8ms 7 days ago 452nd janbehrens 🇩🇪 695 349 447ms 24 Feb 2022 453rd annaproxy 695 427 228ms 14 Aug 2022 454th Shanethegamer 🇺🇸 694 274 21ms 15 Dec 2022 455th PatrickStephansen 🇿🇦 694 388 37ms 7 Nov 2020 455th eranws 694 388 11ms 10 Sep 2023 455th Yax42 🇫🇷 694 388 11ms 20 Jan 2026 458th MeWhenI 🇻🇦 693 477 38ms 29 Nov 2023 459th SirBogman 🇺🇸 692 196 712ms 2 Feb 2020 460th Natanaelel 🇸🇪 692 297 34ms 16 Feb 2024 461st stefangimmillaro 692 426 411ms 4 Oct 2022 462nd stefangimmillaro 692 515 260ms 15 Nov 2023 463rd sean-niemann 🇺🇸 691 313 9ms 21 Apr 2023 464th MarcMush 🇫🇷 691 351 284ms 15 Nov 2023 465th AlephSquirrel 690 249 568ms 22 Jan 2024 466th coreynash 690 390 13ms 24 Feb 2024 466th gigaprofisi 🇺🇸 690 390 12ms 10 Aug 2025 468th Andriamanitra 🇫🇮 689 347 37ms 25 Aug 2022 469th MeWhenI 🇻🇦 689 447 9ms 28 Jun 2023 470th dsntzn 🇸🇰 688 391 12ms 18 Aug 2020 471st RussellEmerine 688 431 198ms 2 May 2020 472nd rambox11 686 479 4ms 24 Jun 2019 473rd BBoehm 🇩🇪 685 393 12ms 9 Feb 2021 474th squadb3 683 394 11ms 10 Oct 2019 475th Shanethegamer 🇺🇸 682 252 576ms 13 Mar 2024 476th olivermrose 🇺🇸 681 351 43ms 26 Oct 2021 477th elgan65536 🇺🇸 681 524 253ms 9 Nov 2025 478th stefangimmillaro 681 536 287ms 5 May 2025 479th CatsAreFluffy 680 436 236ms 18 Dec 2023 480th yzhs 🇩🇪 679 437 219ms 25 Jul 2021 First Prev 401–480 of 1,085 Next Last
