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?
brainfuck 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 321st saito-ta 🇯🇵 698 53 76ms 23 Jul 2022 321st lynn 698 53 77ms 11 Oct 2023 323rd targrik 698 139 6ms 16 Sep 2025 324th Shanethegamer 🇺🇸 698 238 12ms 9 Sep 2022 325th ovs-code 🇩🇪 696 153 17ms 25 May 2024 326th Salutations45 696 167 7ms 23 Jan 2025 327th Shanethegamer 🇺🇸 696 261 3,333ms 27 Oct 2024 328th Shanethegamer 🇺🇸 696 342 149ms 19 May 2023 329th DialFrost 🇸🇬 694 120 345ms 15 Aug 2024 330th DialFrost 🇸🇬 694 128 2,644ms 31 Aug 2025 331st btjones0 694 147 29ms 15 Jul 2022 331st Babafaba 694 147 23ms 17 Nov 2025 333rd KrausRaus 🇺🇸 692 154 13ms 23 Sep 2020 333rd GrayJoKing 🇦🇺 692 154 18ms 28 Apr 2022 333rd Steffan153 🇫🇮 692 154 15ms 28 May 2024 336th MeWhenI 🇻🇦 692 283 339ms 9 Feb 2023 337th isaacg1 692 340 196ms 4 Jan 2020 338th TeodorDyakov 🇧🇬 690 150 2ms 26 Feb 2025 339th Yewzir 🇧🇪 690 373 1,851ms 21 May 2024 340th stefangimmillaro 688 275 41ms 14 Sep 2024 341st o0lit3 🇺🇸 687 73 7ms 27 Sep 2020 342nd inventshah 687 242 11ms 19 Aug 2023 343rd ovs-code 🇩🇪 685 245 230ms 8 Oct 2024 344th BlankSpruce 684 149 14ms 9 Sep 2022 345th primo-ppcg 🇹🇭 684 158 2,136ms 8 Feb 2022 346th frozolotl 684 344 148ms 10 Jan 2020 347th primo-ppcg 🇹🇭 683 122 429ms 12 Dec 2020 348th zohassadar 683 156 16ms 20 Mar 2025 349th H3XDaemon 681 194 65ms 19 Nov 2025 350th dokutan 681 244 9ms 5 Aug 2024 351st 4hg 🇺🇸 680 89 68ms 11 Dec 2022 352nd jacobly0 🇺🇸 678 380 1,821ms 22 Apr 2024 353rd billings7 🇬🇧 676 241 423ms 21 Nov 2021 354th SirBogman 🇺🇸 675 107 5ms 26 Aug 2024 355th 2bular 675 121 39ms 5 days ago 356th jared-hughes 675 189 3ms 10 Apr 2022 357th akshatj27 🇦🇶 674 158 14ms 17 Mar 2022 358th GolfingSuccess 🇬🇷 673 55 80ms 2 Sep 2022 358th orthoplex 🇨🇽 673 55 87ms 4 Feb 2024 360th snoozingnewt 🇨🇦 673 90 43ms 20 Oct 2025 361st frankgraziano 673 324 16ms 22 Feb 2026 362nd dokutan 672 134 197ms 7 Aug 2024 363rd primo-ppcg 🇹🇭 672 169 852ms 4 Apr 2019 364th janbehrens 🇩🇪 671 249 495ms 24 Apr 2023 365th itsh01 670 159 22ms 9 May 2022 366th Shanethegamer 🇺🇸 669 323 174ms 27 Oct 2024 367th jwhear 🇺🇸 669 385 1,831ms 30 Sep 2024 368th jared-hughes 668 170 463ms 3 Aug 2022 369th revlayle 🇺🇸 668 244 414ms 21 Nov 2021 370th snoozingnewt 🇨🇦 668 366 118ms 19 days ago 371st Artemis21 🇬🇧 667 153 37ms 10 Jan 2025 372nd MeWhenI 🇻🇦 666 215 146ms 11 hours ago 373rd GrayJoKing 🇦🇺 665 91 45ms 23 Jul 2024 374th edsrzf 🇳🇿 665 192 4ms 10 Apr 2025 375th Aurel300 🇨🇭 664 354 170ms 6 Jun 2024 376th lifthrasiir 🇰🇷 662 109 4ms 1 Dec 2024 377th dylanarmstrong 662 161 23ms 30 Jan 2024 378th dcgjb 661 126 2,860ms 4 Jun 2024 379th Shanethegamer 🇺🇸 660 217 181ms 24 May 2025 380th The3gs 659 357 163ms 28 Nov 2024 381st tatzyr 🇯🇵 658 92 39ms 12 Feb 2025 382nd birjj 658 162 16ms 12 Mar 2018 382nd jakzo 658 162 19ms 8 Sep 2021 384th KasperKivimaeki 🇫🇮 657 248 455ms 10 Apr 2025 385th timvermeulen 657 358 179ms 4 Jan 2020 386th perlebach 🇨🇿 656 277 3,202ms 7 Jun 2025 387th JDiLenarda 🇫🇷 656 377 1,367ms 28 Oct 2020 388th voytasify 🇵🇱 655 249 398ms 21 Nov 2021 389th ovs-code 🇩🇪 654 147 163ms 26 Aug 2024 390th Attero 🇸🇪 654 163 14ms 28 Oct 2020 390th ScottHamper 654 163 14ms 31 May 2021 390th didion0 🇺🇸 654 163 16ms 25 Feb 2022 390th pineapplebox 654 163 13ms 1 Apr 2022 390th BambooleanLogic 🇸🇪 654 163 18ms 13 Oct 2022 395th GrayJoKing 🇦🇺 653 146 166ms 9 Dec 2025 396th Eolu 653 360 173ms 8 Apr 2021 396th luuumine 🇫🇷 653 360 172ms 9 Dec 2025 398th plcc0 651 93 43ms 10 Oct 2025 399th Babafaba 651 143 467ms 17 Nov 2025 400th Slonser 651 203 510ms 26 Jan 2026 First Prev 321–400 of 1,447 Next Last