The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Levenshtein Distance 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 FlyingPenguin223 645 184 23ms 19 Feb 2025 642nd GolfingSuccess 🇬🇷 644 155 223ms 6 Jan 2026 643rd frankgraziano 644 186 60ms 14 Feb 2026 644th KatieLG 🇬🇧 643 100 481ms 28 Oct 2024 645th Artemis21 🇬🇧 642 106 69ms 10 Jan 2025 646th jacobly0 🇺🇸 642 185 29ms 7 Sep 2023 647th Irratix 🇳🇱 640 256 66ms 3 Aug 2023 648th prplz 🇦🇺 639 151 40ms 29 Apr 2021 648th scpchicken 🇵🇼 639 151 10ms 26 Jan 2022 650th GolfingSuccess 🇬🇷 638 216 50ms 28 Jun 2025 651st michelebastione 🇮🇹 638 229 461ms 26 Dec 2025 652nd MeWhenI 🇻🇦 637 202 129ms 16 Oct 2022 653rd m33m33 🇫🇷 636 131 420ms 5 Apr 2021 654th BambooleanLogic 🇸🇪 634 152 15ms 12 Jan 2023 654th olleicua 🇺🇸 634 152 272ms 4 Feb 2024 656th GrayJoKing 🇦🇺 632 128 188ms 24 Oct 2024 657th GolfingSuccess 🇬🇷 632 130 2,935ms 17 Feb 2026 658th JOrE20 631 308 67ms 23 Feb 2026 659th MeWhenI 🇻🇦 631 309 40ms 26 Aug 2023 660th FlorianCassayre 🇫🇷 630 108 72ms 5 Aug 2025 661st tayloia 🇬🇧 630 153 19ms 13 Jan 2023 662nd antimon2 🇯🇵 628 117 398ms 16 Jun 2021 663rd CatsAreFluffy 627 261 176ms 6 Mar 2023 664th trinityy-7 626 154 24ms 3 May 2024 664th CaedenHarper 🇨🇦 626 154 31ms 16 Nov 2025 666th ian-h-chamberlain 🇺🇸 626 323 226ms 29 Jun 2022 667th emgordon154 625 109 33ms 23 Apr 2025 668th Bubbler-4 624 84 35ms 9 Dec 2021 669th kmathis22 624 280 2ms 28 Jan 2026 670th JRaspass 🇬🇧 624 297 302ms 20 May 2022 671st stefangimmillaro 622 235 449ms 15 Jul 2023 672nd dokutan 621 140 46ms 7 days ago 673rd ovs-code 🇩🇪 621 159 1,202ms 29 Jan 2024 674th GrayJoKing 🇦🇺 621 222 21ms 19 Apr 2022 675th AlephSquirrel 620 226 59ms 19 Feb 2025 676th janbehrens 🇩🇪 620 293 576ms 21 Nov 2022 677th quimey 619 87 4ms 23 Mar 2023 678th rifatx 619 236 460ms 12 Jul 2024 679th Shanethegamer 🇺🇸 616 295 439ms 24 Sep 2025 680th Natanaelel 🇸🇪 614 57 118ms 20 days ago 681st bac0id 614 238 459ms 4 Jul 2024 682nd Shanethegamer 🇺🇸 613 302 330ms 1 Oct 2021 683rd frankgraziano 612 88 4ms 3 Dec 2020 684th emgordon154 612 105 693ms 22 Apr 2025 685th ovs-code 🇩🇪 612 132 257ms 17 Apr 2025 686th dokutan 612 194 21ms 10 Apr 2025 687th bac0id 611 268 3,169ms 3 Jul 2024 688th acollett89 610 158 11ms 4 Aug 2025 689th luuumine 🇫🇷 608 112 71ms 16 Oct 2025 690th RDShah 607 159 19ms 18 Jan 2021 691st stefangimmillaro 607 210 3,537ms 16 Nov 2024 692nd jared-hughes 605 198 12ms 18 Jul 2022 693rd Palladium02 603 160 86ms 3 May 2025 694th SirBogman 🇺🇸 602 87 189ms 28 Jul 2024 695th Yewzir 🇧🇪 600 406 1,947ms 14 Nov 2025 696th janbehrens 🇩🇪 599 161 10ms 30 Sep 2021 697th fgrosshans 🇫🇷 597 114 12ms 19 Jul 2022 697th ZakkkkAttackkkk 🇵🇭 597 114 10ms 19 Sep 2023 699th bac0id 597 240 2ms 3 Jul 2024 700th janbehrens 🇩🇪 596 245 472ms 21 Nov 2021 701st Natanaelel 🇸🇪 595 162 180ms 31 Jul 2022 702nd vgamula 🇺🇦 595 163 181ms 9 Aug 2025 703rd RockOfStone 594 200 38ms 8 Nov 2021 704th Frowny 593 69 540ms 14 Feb 2022 705th schachmattmatt 592 115 67ms 2 Oct 2021 705th wh3n3v3r 🇨🇿 592 115 10ms 18 Nov 2024 707th alexsave 592 163 18ms 13 Dec 2025 708th CaedenHarper 🇨🇦 592 301 165ms 31 Oct 2024 709th Natanaelel 🇸🇪 589 89 1,198ms 25 Oct 2023 710th JOrE20 588 303 231ms 23 Feb 2026 711th yzhs 🇩🇪 586 316 372ms 19 Nov 2020 712th targrik 584 165 11ms 17 Jun 2025 713th MarcMush 🇫🇷 583 126 371ms 9 Jul 2021 714th msbranicky 582 300 96ms 10 Aug 2023 715th m-tkach 🇺🇦 581 348 239ms 20 Oct 2022 716th joshuaxie8 580 313 512ms 9 Jul 2025 716th eMGeeneer 580 313 488ms 20 Sep 2025 718th weliveinhell 🇭🇹 579 320 338ms 16 Nov 2023 719th Omega65536 🇩🇪 578 314 595ms 24 Nov 2022 719th dokutan 578 314 562ms 7 Nov 2025 First Prev 641–720 of 1,186 Next Last