The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
99 Bottles of Beer 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 555th l-donovan 839 244 10ms 18 Jan 2024 555th zhaohm14 839 244 10ms 6 Jan 2026 563rd inventshah 838 239 2ms 23 Jan 2023 564th tamanugi 🇯🇵 838 279 83ms 2 Nov 2022 565th wouterraateland 837 237 10ms 8 Jul 2019 565th rope-hmg 837 237 8ms 19 Apr 2022 567th albanian-laundromat 837 266 118ms 11 Nov 2025 568th Attero 🇸🇪 837 289 439ms 26 Apr 2020 569th voytxt 🇨🇿 837 311 3ms 15 Jul 2023 570th m-dango 836 218 119ms 17 Oct 2017 571st Kloppermand 🇩🇰 835 245 10ms 9 Aug 2021 571st amollberg 🇸🇪 835 245 10ms 5 Jan 2022 571st logvp 835 245 10ms 11 Jan 2024 574th MichalMarsalek 🇨🇿 834 278 126ms 18 Mar 2022 575th Liibe 834 290 456ms 25 Sep 2025 576th olivermrose 🇺🇸 833 233 34ms 16 Oct 2021 577th garytang8 833 238 10ms 15 Apr 2020 577th janlelis 833 238 10ms 11 Feb 2021 577th stefangabos 🇷🇴 833 238 10ms 16 Sep 2022 580th MeWhenI 🇻🇦 833 278 3ms 1 Oct 2022 581st MeWhenI 🇻🇦 833 313 25ms 7 Jun 2023 582nd phdphil 832 219 113ms 23 Apr 2018 583rd sultan 832 228 264ms 4 May 2021 584th kevinmchung 832 246 10ms 26 Feb 2018 584th jakubtomany 832 246 9ms 20 Apr 2020 584th urojony 🇵🇱 832 246 10ms 28 Dec 2020 584th Powerroff 832 246 12ms 18 Jan 2025 588th klundberg 831 285 86ms 19 Jan 2020 589th frankgraziano 831 476 16ms 17 Oct 2025 590th lynn 830 234 34ms 3 Apr 2021 591st gurena-wm 830 239 10ms 10 Apr 2020 591st raphaelimahorn 830 239 11ms 17 Aug 2021 591st Yewzir 🇧🇪 830 239 9ms 9 Nov 2023 591st alex742 830 239 11ms 23 May 2024 591st TepidDrink 830 239 9ms 23 May 2024 591st MeWhenI 🇻🇦 830 239 1,550ms 29 Aug 2025 597th jacklynnepenick 829 247 10ms 20 Aug 2021 597th sultan 829 247 11ms 13 Jun 2022 597th lucasvazq 🇦🇷 829 247 15ms 7 Dec 2022 597th yishayv 829 247 16ms 18 Jan 2023 597th JorgiEagle 829 247 10ms 8 Feb 2024 597th Artemis21 🇬🇧 829 247 17ms 1 Jan 2025 597th davecame 829 247 17ms 2 Oct 2025 604th DialFrost 🇸🇬 829 267 472ms 19 Jan 2025 605th marshallward 🇺🇸 829 332 42ms 7 May 2025 606th blaztoma 🇱🇹 829 333 119ms 27 Nov 2025 607th prplz 🇦🇺 829 835 6ms 9 Apr 2019 607th BloodStormKnight 829 835 6ms 16 Oct 2022 609th edsrzf 🇳🇿 828 326 285ms 8 Sep 2024 610th GrayJoKing 🇦🇺 828 837 6ms 14 Feb 2020 611th user189032 826 240 10ms 29 May 2019 611th apraxWorkMarket 826 240 9ms 12 Apr 2020 611th frontvu 826 240 10ms 13 Apr 2020 611th TechNolaByte 826 240 9ms 18 Jun 2021 611th emgordon154 826 240 15ms 6 Dec 2021 616th janbehrens 🇩🇪 825 230 282ms 3 Dec 2023 617th mediocr3 825 248 10ms 11 Aug 2023 617th greentruff 825 248 16ms 7 Dec 2025 617th CommandLeo 🇮🇹 825 248 15ms 26 Dec 2025 620th AaronKreipe 825 287 87ms 24 Jan 2020 620th johnnythedoggie 825 287 105ms 9 Oct 2020 622nd primo-ppcg 🇹🇭 824 304 140ms 2 May 2022 623rd albanian-laundromat 824 480 15ms 10 Sep 2025 624th ovs-code 🇩🇪 823 257 2ms 23 Jul 2024 625th albanian-laundromat 823 266 3ms 17 Nov 2025 626th 1lann 823 328 276ms 17 Apr 2020 627th labster 822 212 3ms 4 Feb 2018 628th okhoel 🇳🇴 822 231 274ms 7 Oct 2022 629th proton 🇩🇪 822 236 35ms 9 Jun 2020 629th yzhs 🇩🇪 822 236 40ms 6 Sep 2020 631st suchir 822 249 10ms 5 Jun 2021 631st bbakersmith 822 249 9ms 19 Jul 2021 631st Fracture17 822 249 10ms 2 Apr 2023 631st keelimeguy 🇺🇸 822 249 10ms 5 Nov 2023 631st pfaion 🇩🇪 822 249 9ms 3 Mar 2024 631st SB-945 822 249 10ms 17 Apr 2024 631st andrewjc2000 822 249 10ms 14 Jul 2025 631st erikji 822 249 9ms 28 Jul 2025 631st YAJUE114514 822 249 9ms 10 Dec 2025 640th prestosilver 🇺🇸 822 282 427ms 20 Jan 2026 First Prev 561–640 of 3,937 Next Last