The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 28 hours. 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 481st SirBogman 🇺🇸 678 303 40ms 9 Sep 2022 482nd GolfingSuccess 🇬🇷 678 373 21ms 18 Aug 2024 483rd gastropner 676 513 445ms 16 Jul 2025 484th Andriamanitra 🇫🇮 675 359 290ms 25 Aug 2022 485th JRaspass 🇬🇧 675 541 292ms 23 Sep 2022 486th shreyasminocha 674 399 13ms 2 Aug 2020 486th xkacer 🇨🇿 674 399 12ms 30 Jan 2021 486th mrxz 🇳🇱 674 399 13ms 9 May 2021 489th dijs 673 400 11ms 21 Dec 2019 490th Yewzir 🇧🇪 671 138 30ms 24 Dec 2023 491st janAkali 🇷🇺 671 470 408ms 21 Jan 2026 492nd HumanoidCPU 668 403 16ms 25 Nov 2025 493rd tobeannouncd 668 444 223ms 12 Jan 2024 494th postie77 667 442 393ms 23 May 2023 495th arctouch-cristiannevianna 666 443 398ms 28 Feb 2024 496th cafehaine 🇫🇷 666 508 3ms 6 Sep 2021 497th emgordon154 664 381 16ms 22 Sep 2024 498th tayloia 🇬🇧 664 405 13ms 15 May 2023 499th CaedenHarper 🇨🇦 663 385 1,263ms 11 Sep 2025 500th alexsave 663 406 12ms 2 Dec 2025 501st targrik 663 413 11ms 17 Jan 2025 502nd stefangimmillaro 662 365 1,271ms 4 Oct 2022 503rd Phil-RGOMEGA 661 512 3ms 9 May 2023 504th pzagrebin 660 349 56ms 16 Jul 2022 505th HumanoidCPU 660 498 4ms 25 Nov 2025 506th madeforlosers 658 409 13ms 4 hours ago 507th dokutan 655 477 5ms 9 Apr 2025 508th Shanethegamer 🇺🇸 654 276 3ms 15 Dec 2022 509th malworthy 654 451 405ms 18 Oct 2023 510th SmartK8 🇨🇿 651 453 433ms 12 Nov 2022 511th klixel 🇨🇦 648 550 190ms 19 Jun 2023 512th lifthrasiir 🇰🇷 647 279 3ms 28 Nov 2024 513th tomh1012 647 416 11ms 21 Sep 2020 514th yokasuretsu 644 371 35ms 19 Apr 2018 515th wansacis 🇩🇪 644 418 11ms 14 Jun 2022 516th djeedjay 🇳🇱 644 510 5ms 27 Oct 2020 517th SirBogman 🇺🇸 642 281 5ms 8 Aug 2024 518th error256 642 353 1,958ms 8 Jun 2025 519th ReidZ3 🇺🇸 641 463 228ms 2 Dec 2020 519th boxjelly 641 463 227ms 14 Mar 2022 521st jgbaldwinbrown 641 570 290ms 6 Jul 2021 522nd lynn 640 297 182ms 6 Apr 2021 523rd citsur 639 464 244ms 20 Jun 2019 524th acollett89 638 422 12ms 1 Aug 2025 525th Widgitty 638 515 5ms 24 Sep 2025 526th JRaspass 🇬🇧 637 278 4ms 7 Oct 2020 526th Shanethegamer 🇺🇸 637 278 5ms 16 Dec 2021 528th RockOfStone 635 533 3ms 9 Mar 2024 529th MeWhenI 🇻🇦 634 486 23ms 18 Nov 2021 530th SpareManiKatti 632 426 13ms 9 Sep 2021 531st dokutan 631 488 5ms 3 Dec 2025 532nd pandapawskat 630 521 4ms 1 Sep 2021 533rd primo-ppcg 🇹🇭 627 383 473ms 29 Sep 2021 534th snoozingnewt 🇨🇦 625 471 95ms 19 Oct 2025 535th CarsonChr 🇺🇸 619 435 11ms 21 May 2023 536th emgordon154 618 562 14ms 10 Jun 2025 537th jaredcrystal 🇺🇸 615 389 42ms 13 Dec 2018 538th KatieLG 🇬🇧 615 393 1,433ms 25 Apr 2021 539th snoozingnewt 🇨🇦 615 537 171ms 13 Sep 2025 540th cmayer777 614 535 4ms 20 Dec 2022 541st h3ra993huskp 🇯🇵 613 392 578ms 30 Nov 2025 542nd roavin 613 481 425ms 30 Jun 2022 542nd codewrite 🇬🇧 613 481 419ms 31 Dec 2025 544th rbertram90 🇬🇧 611 448 6ms 3 May 2025 545th bac0id 611 538 3ms 24 Dec 2024 546th neihousaigaai 610 394 454ms 2 Apr 2021 546th kmathis22 610 394 491ms 7 Dec 2025 548th RegularSalamander 610 441 12ms 30 Jan 2022 549th ericlangedijk 🇸🇮 610 483 417ms 18 Mar 2022 550th Laksen 🇩🇰 609 656 25ms 9 Jul 2021 551st gnlow 🇰🇷 607 443 12ms 27 Jan 2022 552nd IISResetMe 606 408 331ms 7 Mar 2024 553rd MattShaile 605 445 13ms 13 Apr 2022 554th mckymsh 603 446 12ms 14 Feb 2024 554th XenThe 🇬🇧 603 446 11ms 23 Jun 2025 556th Meowsan91 🇨🇿 603 489 413ms 21 Nov 2021 557th alphafalfa 601 360 6ms 25 Oct 2024 558th biinari 601 398 37ms 18 Mar 2018 559th samthidny 599 449 11ms 13 Apr 2022 560th two-bad 🇬🇧 598 450 11ms 25 Feb 2024 First Prev 481–560 of 1,085 Next Last
