The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 27 hours. Why not try and solve them ahead of time?
Spelling Numbers 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 641st MeWhenI 🇻🇦 417 543 113ms 6 Nov 2023 642nd bwat2 417 572 422ms 24 May 2022 643rd dijs 416 400 11ms 21 Dec 2019 644th pandapawskat 415 521 4ms 1 Sep 2021 645th yuchuehw 415 574 456ms 1 Jan 2024 646th MeWhenI 🇻🇦 413 332 400ms 14 Feb 2023 647th mcipperly 413 422 331ms 26 Aug 2018 648th joshuaxie8 412 579 462ms 9 Jul 2025 649th alexsave 410 406 12ms 2 Dec 2025 650th mazzegi 408 896 287ms 18 Apr 2020 651st cmayer777 404 535 4ms 20 Dec 2022 652nd ovs-code 🇩🇪 403 288 39ms 9 Jul 2024 653rd Apataras 403 591 463ms 12 Aug 2025 654th bac0id 402 538 3ms 24 Dec 2024 655th sisyphus-ppcg 🇦🇺 400 290 38ms 3 Feb 2022 656th tomh1012 400 416 11ms 21 Sep 2020 657th wansacis 🇩🇪 398 418 11ms 14 Jun 2022 658th msbranicky 397 203 46ms 25 Dec 2023 659th janbehrens 🇩🇪 395 347 447ms 24 Feb 2022 660th acollett89 394 422 12ms 1 Aug 2025 661st brochmann 🇸🇪 392 284 21ms 13 Aug 2023 662nd SpareManiKatti 391 426 13ms 9 Sep 2021 663rd avila-gabriel 388 918 174ms 17 Oct 2024 664th Andriamanitra 🇫🇮 384 357 290ms 25 Aug 2022 665th XaavanDolence 384 772 187ms 7 Sep 2020 666th plcc0 383 264 72ms 3 Nov 2025 667th CarsonChr 🇺🇸 383 435 11ms 21 May 2023 668th boxjelly 383 565 4ms 17 Feb 2021 669th MeWhenI 🇻🇦 380 1,167 1,461ms 10 Feb 2025 670th dokutan 378 677 1,075ms 5 Feb 2025 671st RegularSalamander 377 441 12ms 30 Jan 2022 672nd kaascevich 376 360 232ms 20 Jul 2025 673rd gnlow 🇰🇷 376 443 12ms 27 Jan 2022 674th papachan 375 215 25ms 12 Dec 2023 675th lynn 375 297 182ms 6 Apr 2021 676th MattShaile 374 445 13ms 13 Apr 2022 677th mckymsh 373 446 12ms 14 Feb 2024 678th cafehaine 🇫🇷 373 508 3ms 6 Sep 2021 679th samthidny 371 449 11ms 13 Apr 2022 680th two-bad 🇬🇧 370 450 11ms 25 Feb 2024 681st Phil-RGOMEGA 370 512 3ms 9 May 2023 682nd HumanoidCPU 369 302 25ms 24 days ago 683rd jared-hughes 367 316 38ms 12 Sep 2022 684th dokutan 367 560 2,305ms 1 Feb 2026 685th bwenstar 362 308 21ms 12 Aug 2022 686th dokutan 361 874 395ms 1 Dec 2025 687th dokutan 361 963 15ms 7 Nov 2025 688th Florian-Mt 359 464 13ms 12 Jul 2024 689th SkimnerPhi 358 465 11ms 5 Dec 2020 690th TornadoCookie 358 605 3ms 25 Dec 2022 691st sebipopa 🇷🇴 356 467 14ms 12 Sep 2022 691st Ow0cast 356 467 13ms 17 Oct 2025 693rd RockOfStone 355 533 3ms 9 Mar 2024 694th menglishca 🇨🇦 355 671 451ms 5 Aug 2021 695th HumanoidCPU 353 298 448ms 24 days ago 696th backupGitProfile 353 752 428ms 21 Nov 2021 697th proton 🇩🇪 349 333 36ms 13 Jun 2020 698th bzijlema 🇳🇱 343 325 14ms 7 Jul 2025 699th JRaspass 🇬🇧 342 278 4ms 7 Oct 2020 700th klixel 🇨🇦 341 1,070 285ms 6 Jun 2023 701st bricknellj 340 328 14ms 19 Jul 2024 702nd stefangimmillaro 339 342 58ms 4 Oct 2022 703rd akshatj27 🇦🇶 337 494 13ms 11 Jan 2022 704th Andriamanitra 🇫🇮 335 347 37ms 25 Aug 2022 705th yokasuretsu 334 223 139ms 30 Nov 2021 706th ryguyNelson 330 656 4ms 6 Oct 2020 707th IISResetMe 329 408 331ms 7 Mar 2024 708th janbehrens 🇩🇪 328 340 14ms 17 Jun 2023 709th rak1507 🇬🇧 328 627 39ms 13 Sep 2021 710th ahmetdemirag 🇨🇾 326 342 13ms 11 Aug 2024 711th snoozingnewt 🇨🇦 326 416 120ms 21 Nov 2025 712th dokutan 324 588 6ms 5 Oct 2024 713th fisherthomas14 323 738 485ms 13 May 2021 713th ravnskjaer 🇩🇰 323 738 429ms 15 Dec 2025 715th neihousaigaai 322 346 14ms 7 Jul 2021 715th sultan 322 346 14ms 26 Feb 2024 715th 051 🇸🇬 322 346 21ms 28 Feb 2024 718th marcin7Cd 321 347 20ms 16 Dec 2020 719th lahell 321 418 404ms 17 Jun 2020 720th phdphil 320 233 216ms 28 Mar 2018 First Prev 641–720 of 1,081 Next Last
