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 241st Natanaelel 🇸🇪 778 105 34ms 28 Nov 2025 242nd RYNO8 778 131 23ms 11 Sep 2021 243rd lifthrasiir 🇰🇷 778 289 59ms 17 Dec 2024 244th stefangimmillaro 777 234 3,365ms 12 Nov 2024 245th ndren 776 120 571ms 30 Jan 2024 245th snoozingnewt 🇨🇦 776 120 464ms 22 Nov 2025 247th kg583 🇺🇸 775 173 18ms 14 days ago 248th edre 773 132 32ms 7 Jun 2018 248th yzhs 🇩🇪 773 132 23ms 20 Jul 2022 248th 2011-Chan-Ethan 773 132 52ms 16 Sep 2023 251st Protothor 772 138 16ms 17 days ago 252nd MichalMarsalek 🇨🇿 772 209 592ms 5 Nov 2022 253rd primo-ppcg 🇹🇭 771 48 71ms 8 Feb 2023 254th prplz 🇦🇺 770 149 2,908ms 9 Jan 2022 255th Shanethegamer 🇺🇸 769 121 501ms 11 Jan 2025 255th dokutan 769 121 445ms 15 Feb 2026 257th stefangimmillaro 769 212 494ms 10 Apr 2025 258th SirBogman 🇺🇸 768 230 586ms 29 Dec 2021 259th SB-945 767 133 22ms 6 Feb 2024 260th MostParsingVex 767 237 3,351ms 30 Oct 2024 261st prplz 🇦🇺 766 79 45ms 7 Jun 2020 261st sean-niemann 🇺🇸 766 79 47ms 1 Jan 2026 263rd Jaymesv2 766 307 175ms 2 Dec 2023 264th GolfingSuccess 🇬🇷 766 564 1,309ms a min ago 265th dokutan 761 140 13ms 3 Aug 2024 266th albanian-laundromat 759 117 3,104ms 7 Nov 2025 267th MeWhenI 🇻🇦 759 326 1,356ms 29 Jul 2024 268th snoozingnewt 🇨🇦 757 127 560ms 22 Nov 2025 269th frobinsonj 756 141 18ms 6 Dec 2019 270th commandz0 🇺🇸 755 135 22ms 22 Aug 2023 271st Johannesd3 754 312 182ms 2 Feb 2021 272nd HPWiz 🇳🇿 752 96 89ms 26 Aug 2024 273rd stefangimmillaro 752 235 691ms 6 Oct 2025 274th KatieLG 🇬🇧 751 124 446ms 28 Oct 2024 275th fkantelberg 750 136 24ms 17 Jul 2023 276th stefangimmillaro 750 261 301ms 21 Sep 2024 277th xsot 🇸🇬 749 155 21ms 2 Feb 2025 278th elgan65536 🇺🇸 749 314 157ms 28 Mar 2024 279th artyom-razinov 749 318 187ms 13 Feb 2020 280th snyderek 🇺🇸 746 177 66ms 23 Nov 2024 281st SirBogman 🇺🇸 745 125 449ms 24 Jan 2024 282nd NewDefectus 🇮🇱 745 143 15ms 12 Oct 2020 283rd MeWhenI 🇻🇦 741 220 472ms 19 Jun 2025 283rd Yax42 🇫🇷 741 220 440ms 3 Aug 2025 285th mousetail 🇳🇱 740 318 150ms 14 Mar 2024 286th MeWhenI 🇻🇦 739 239 505ms 7 Nov 2025 287th MeWhenI 🇻🇦 739 246 3,079ms 2 Dec 2024 288th emgordon154 738 122 132ms 1 Sep 2024 289th lynn 738 266 360ms 19 Sep 2021 290th Shanethegamer 🇺🇸 737 182 11ms 28 Sep 2024 291st pfgithub 735 145 16ms 27 Oct 2020 291st KaeruCT 735 145 14ms 2 Sep 2024 293rd namelessiw 734 222 491ms 9 Apr 2025 294th bstrautin 731 114 595ms 30 Jun 2020 295th Shanethegamer 🇺🇸 730 83 43ms 21 Oct 2021 296th ovs-code 🇩🇪 726 230 471ms 27 Jul 2024 297th MeWhenI 🇻🇦 725 147 13ms 14 Jul 2021 297th gussy420 725 147 15ms 27 Oct 2023 299th emplv 🇱🇻 724 134 5ms 26 Nov 2023 300th GrayJoKing 🇦🇺 723 223 394ms 8 May 2022 301st DialFrost 🇸🇬 721 84 71ms 30 Jan 2023 301st anter69 🇭🇺 721 84 73ms 19 Mar 2024 303rd edsrzf 🇳🇿 721 475 174ms 7 Mar 2025 304th Steffan153 🇫🇮 720 125 197ms 4 Aug 2024 305th ian-h-chamberlain 🇺🇸 719 327 171ms 26 Jul 2022 306th SirBogman 🇺🇸 718 435 83ms 6 Nov 2022 307th HumanoidCPU 717 332 122ms 29 Mar 2025 308th edsrzf 🇳🇿 716 208 9ms 24 days ago 309th Lydxn 🇨🇦 715 149 21ms 16 Jul 2023 310th sean-niemann 🇺🇸 714 126 130ms 19 May 2025 311th MostParsingVex 714 185 464ms 2 Jan 2025 312th SirBogman 🇺🇸 712 85 40ms 26 Dec 2023 313th thisishowmymindworks 🇳🇴 710 150 43ms 14 Sep 2020 314th GolfingSuccess 🇬🇷 707 235 49ms 11 Sep 2022 315th stackotter 707 337 157ms 29 May 2023 316th Sloimayyy 703 145 22ms 22 Aug 2022 317th ovs-code 🇩🇪 703 188 478ms 8 Jun 2024 318th imreallybadatnames 703 366 2,057ms 16 Mar 2025 319th HumanEquivalentUnit 700 119 648ms 24 Jun 2020 320th MeWhenI 🇻🇦 699 164 33ms 9 May 2024 First Prev 241–320 of 1,447 Next Last