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?
99 Bottles of Beer 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 msbranicky 684 500 1,653ms 17 Sep 2025 642nd Attero 🇸🇪 683 206 10ms 20 Oct 2020 643rd Yewzir 🇧🇪 683 386 273ms 20 Mar 2023 644th jvdp1 683 387 39ms 25 Dec 2020 645th dokutan 682 172 37ms 23 Apr 2025 646th iczelia 🇩🇪 682 279 2ms 22 Sep 2025 647th Lukas-Fuchs 682 358 145ms 7 Feb 2022 647th msbranicky 682 358 144ms 6 Oct 2023 647th makononov 682 358 157ms 3 Mar 2025 650th vezzick 681 172 17ms 8 Mar 2021 650th Terobero 681 172 10ms 2 Sep 2024 652nd DialFrost 🇸🇬 681 267 2ms 8 Nov 2023 652nd albanian-laundromat 681 267 2ms 9 Nov 2025 654th chris-araman 681 336 103ms 3 Jan 2022 655th alphafalfa 680 280 2ms 1 Aug 2025 656th Juici 680 359 146ms 24 Sep 2020 657th jakzo 679 207 10ms 12 Sep 2021 657th binary-person 679 207 10ms 8 Feb 2022 659th jahakari 679 256 420ms 21 Nov 2021 660th RussellEmerine 679 333 139ms 8 Apr 2020 661st nchn27 678 349 408ms 4 Apr 2022 662nd fredrik-bakke 🇳🇴 677 173 12ms 2 Oct 2022 663rd dokutan 677 179 126ms 7 Aug 2024 664th RainOrigami 🇩🇪 677 257 417ms 18 Dec 2021 665th yanqui-uxo 677 334 130ms 6 Sep 2018 666th BambooleanLogic 🇸🇪 676 208 10ms 19 Oct 2022 667th crizin 🇰🇷 676 350 439ms 8 Sep 2023 668th lamba09 676 390 298ms 20 Aug 2020 669th Johannesd3 675 282 5ms 9 Apr 2021 670th jdkleuver 675 335 134ms 8 Aug 2022 670th Xzyaihni 675 335 130ms 1 May 2023 672nd jalone87 675 339 113ms 24 Jan 2020 673rd theentropic 674 258 398ms 21 Nov 2021 674th SuperFola 674 351 3ms 4 days ago 675th bob-th 673 174 11ms 26 Jun 2022 675th Starwort 🇬🇧 673 174 11ms 4 Dec 2022 677th lukasneukom 🇨🇭 673 340 104ms 9 Dec 2022 678th sultan 672 283 4ms 4 May 2021 679th Leftykap 671 353 435ms 24 Aug 2022 680th bryanmytko 670 210 10ms 9 May 2018 681st 386asm 🇺🇸 670 246 40ms 29 Apr 2023 682nd fischfood 670 284 4ms 8 Aug 2024 683rd Yewzir 🇧🇪 670 290 60ms 4 Aug 2023 684th gallium-gonzollium 669 175 11ms 25 Aug 2024 685th nicholas-vella 669 342 93ms 26 Jan 2020 686th lynn 668 241 2ms 28 Sep 2021 687th dbrowndan 668 285 4ms 18 Sep 2020 688th SirBogman 🇺🇸 667 126 4ms 15 Feb 2020 689th itsh01 667 211 10ms 16 Mar 2022 689th helbling 🇨🇭 667 211 10ms 22 Feb 2024 691st ffelixm 667 320 116ms 29 May 2025 692nd Joe0 667 355 460ms 22 Apr 2020 693rd Wanderkind 🇰🇷 667 376 33ms 9 Jan 2023 694th DialFrost 🇸🇬 666 176 36ms 8 Jan 2023 695th SmartK8 🇨🇿 666 261 419ms 30 Oct 2022 696th MeWhenI 🇻🇦 665 242 2ms 26 May 2023 697th Irratix 🇳🇱 665 340 132ms 19 Nov 2021 697th xmamalou 🇬🇷 665 340 134ms 17 Sep 2023 699th MahlerFive 🇨🇦 665 396 303ms 19 Apr 2020 700th timvermeulen 664 368 158ms 4 Jan 2020 701st crazyo 663 212 10ms 14 Apr 2020 702nd emgordon154 663 280 480ms 31 May 2025 703rd XanderLem 663 357 430ms 3 Aug 2021 704th CatsAreFluffy 661 177 10ms 18 Dec 2022 704th PixelSoftwareStudios 🇺🇸 661 177 11ms 15 Jun 2024 704th wh3n3v3r 🇨🇿 661 177 11ms 8 Nov 2024 707th wilihybrid 🇫🇮 661 294 65ms 6 Jan 2022 708th ravnskjaer 🇩🇰 661 358 453ms 15 Dec 2025 709th Posandu 660 213 11ms 26 Dec 2022 709th tayloia 🇬🇧 660 213 10ms 12 Jan 2023 711th janbehrens 🇩🇪 660 281 472ms 24 Mar 2022 712th GrayJoKing 🇦🇺 659 260 2ms 13 Sep 2022 713th msbranicky 659 347 92ms 15 Sep 2023 714th sharkree 659 359 429ms 31 Oct 2022 715th msbranicky 659 398 25ms 4 Jan 2024 716th MeWhenI 🇻🇦 659 401 53ms 3 Jul 2023 717th Babafaba 658 171 403ms 3 Nov 2025 718th jatloe 658 178 11ms 28 Jan 2024 718th megargayu 658 178 17ms 14 Aug 2025 720th ybrodala 658 289 4ms 24 Aug 2021 First Prev 641–720 of 3,915 Next Last
