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 800th maxgodfrey2004 🇨🇦 481 212 21ms 13 Jul 2025 800th Bmrl7 481 212 22ms 22 Dec 2025 803rd Just4FunCoder 479 213 18ms 22 Mar 2023 804th filharmonista 479 216 2ms 20 Nov 2019 804th Szum123321 🇵🇱 479 216 2ms 28 Nov 2023 804th LostSyntax21 🇬🇧 479 216 2ms 19 Jan 2025 807th MeWhenI 🇻🇦 479 652 60ms 28 Aug 2023 808th Juici 478 223 17ms 8 Feb 2021 809th m42km 477 195 518ms 3 Feb 2024 810th derp-all-day 476 204 6ms 27 Nov 2019 811th Xbot781 476 224 13ms 12 Aug 2023 812th scpchicken 🇵🇼 475 125 2,963ms 8 Apr 2022 813th Irratix 🇳🇱 475 218 2ms 13 Jun 2022 814th c0d3-4-F00d 🇩🇪 475 343 409ms 21 Nov 2021 815th alomiF 475 413 135ms 25 Aug 2024 816th Natanaelel 🇸🇪 474 78 136ms 18 Feb 2025 817th xorraxrax 474 215 21ms 31 Oct 2019 817th dzshn 474 215 43ms 7 Feb 2023 817th yokasuretsu 474 215 22ms 7 Jan 2025 820th hamhub7 474 344 376ms 9 Aug 2022 821st jared-hughes 473 128 49ms 12 Sep 2022 821st jstanley0 473 128 40ms 18 Jan 2024 823rd lrustand 472 216 22ms 1 Feb 2018 823rd robin-scragg 472 216 19ms 3 Oct 2025 825th namelessiw 472 280 63ms 27 Nov 2023 826th crizin 🇰🇷 472 374 591ms 9 Sep 2023 827th KasperKivimaeki 🇫🇮 471 206 5ms 9 Dec 2025 828th martion2007 470 217 22ms 22 Sep 2024 829th hughsimpson 469 107 28ms 2 Feb 2018 830th janAkali 🇷🇺 469 344 366ms 9 Jan 2026 831st albanian-laundromat 468 199 543ms 21 Aug 2025 832nd dzhang314 468 218 22ms 15 Aug 2019 832nd netfri25 🇮🇱 468 218 21ms 14 Feb 2026 834th gastropner 468 221 2ms 22 Dec 2020 834th madex 🇩🇪 468 221 2ms 22 Sep 2021 836th adamnielson42 🇺🇸 467 228 18ms 23 Feb 2025 837th MeWhenI 🇻🇦 467 243 3,883ms 18 Nov 2023 838th muctashio 467 378 517ms 24 May 2020 839th snoozingnewt 🇨🇦 467 389 3,326ms 20 Oct 2025 840th Mikey-Beep 🇬🇧 466 219 21ms 5 Sep 2024 841st wansacis 🇩🇪 466 222 2ms 21 Aug 2021 841st Denverjin 466 222 2ms 2 Nov 2021 843rd AnnoyedArt1256 465 229 19ms 7 Jan 2025 844th dim-an 464 220 31ms 9 Dec 2020 844th PaulMWeiser 464 220 24ms 26 Feb 2023 844th ahmetdemirag 🇨🇾 464 220 375ms 25 Apr 2025 847th JOrE20 464 463 284ms 10 Feb 2026 848th Lv0Sys 🇵🇱 462 131 40ms 30 Nov 2025 848th darrenks 🇺🇸 462 131 51ms 25 Feb 2026 850th Heathcorp 🇦🇺 462 224 2ms 11 Oct 2022 850th FortuiteMan 🇫🇷 462 224 2ms 10 Oct 2024 850th LvLError 462 224 2ms 29 May 2025 850th Lv0Sys 🇵🇱 462 224 2ms 29 May 2025 850th warmCabin 462 224 2ms 31 Dec 2025 850th emgordon154 462 224 2ms 14 Feb 2026 850th aksyristos 462 224 2ms 32 hours ago 857th ReimuA 462 353 417ms 26 Jul 2022 858th jhu04 461 221 22ms 18 Jan 2024 858th snydej 461 221 245ms 28 Nov 2024 860th GodlyProgrammer1 460 225 2ms 15 Nov 2025 861st Andriamanitra 🇫🇮 459 132 37ms 9 Oct 2023 862nd daedals 459 222 28ms 12 Jun 2019 862nd PyPylia 🇦🇺 459 222 22ms 24 May 2021 862nd diddily 459 222 22ms 18 Nov 2022 865th neihousaigaai 459 232 13ms 6 Mar 2022 866th dokutan 459 292 12ms 20 Oct 2023 867th castur1 459 355 395ms 16 Feb 2022 868th jmerle 🇳🇱 458 210 670ms 19 Jun 2023 869th snoozingnewt 🇨🇦 458 212 6ms 20 Oct 2025 870th Shanethegamer 🇺🇸 458 386 416ms 24 Sep 2025 871st jgbaldwinbrown 458 427 370ms 5 Jul 2021 872nd Natanaelel 🇸🇪 457 130 1,471ms 14 Oct 2021 873rd pascscha 457 223 385ms 13 May 2022 873rd MaxElf999 457 223 63ms 23 Sep 2022 873rd 1231234md5 🇨🇳 457 223 12ms 12 Dec 2023 876th typeswitch-dev 🇵🇹 457 233 12ms 28 Jul 2023 877th tailorspy 457 289 489ms 3 Mar 2023 878th bschorno 457 357 402ms 3 Aug 2022 879th fuzzylojik-golf 🇺🇸 456 204 538ms 31 May 2025 880th Tonic-Box 456 213 6ms 5 Nov 2020 First Prev 801–880 of 1,447 Next Last