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 401st jared-hughes 650 164 17ms 13 Apr 2022 402nd duckyluuk 🇳🇱 650 235 101ms 13 Nov 2025 403rd MeWhenI 🇻🇦 648 235 40ms 26 Aug 2023 404th b97tsk 648 302 349ms 23 Apr 2020 405th MeWhenI 🇻🇦 647 219 26ms 28 Jul 2023 405th typeswitch-dev 🇵🇹 647 219 5ms 2 Aug 2023 407th jbt 646 165 15ms 28 Dec 2023 407th error256 646 165 13ms 19 Nov 2024 409th primo-ppcg 🇹🇭 645 198 3ms 31 Oct 2021 409th Marre3 645 198 3ms 29 Jul 2022 411th KatieLG 🇬🇧 644 94 41ms 2 Oct 2025 412th CaedenHarper 🇨🇦 644 138 2,464ms 4 Sep 2025 413th Mandrzejy 🇵🇱 644 205 450ms 17 Mar 2025 414th dokutan 644 231 7ms 5 Sep 2024 415th rucin93 🇵🇱 643 140 161ms 31 Oct 2024 416th olleicua 🇺🇸 642 166 15ms 15 Jan 2024 416th nathanadams 🇳🇿 642 166 18ms 6 Oct 2025 418th Steffan153 🇫🇮 642 199 3ms 18 Feb 2024 418th RockOfStone 642 199 3ms 2 Nov 2024 420th fajost 641 159 419ms 10 Sep 2020 421st MeWhenI 🇻🇦 641 295 40ms 17 May 2023 422nd Xzyaihni 641 367 224ms 15 Jan 2024 423rd SirBogman 🇺🇸 639 128 36ms 26 Apr 2022 424th ovs-code 🇩🇪 639 162 2ms 19 Mar 2024 424th MostParsingVex 639 162 3ms 2 Jan 2025 426th emplv 🇱🇻 638 141 154ms 1 Nov 2024 427th p01 638 167 14ms 12 Apr 2018 427th coreynash 638 167 19ms 28 Sep 2023 427th Natanaelel 🇸🇪 638 167 17ms 18 Feb 2025 430th NickTheEASDude 🇺🇸 638 200 3ms 1 Oct 2024 431st 386asm 🇺🇸 637 239 48ms 4 May 2023 432nd msbranicky 637 369 165ms 19 Sep 2023 433rd sean-niemann 🇺🇸 636 278 452ms 24 Sep 2025 434th edsrzf 🇳🇿 636 308 298ms 25 Oct 2024 435th jared-hughes 635 208 511ms 2 Nov 2022 436th Shanethegamer 🇺🇸 635 611 1,558ms 8 Apr 2025 437th stefangimmillaro 634 168 13ms 27 Sep 2024 438th roavin 634 257 472ms 5 Jul 2022 439th bendiscz 634 309 293ms 21 Apr 2020 440th Steffan153 🇫🇮 633 152 900ms 15 Aug 2024 441st Natanaelel 🇸🇪 631 96 41ms 14 Oct 2021 442nd trinityy-7 631 169 12ms 10 Oct 2023 442nd targrik 631 169 18ms 7 Jun 2025 442nd KasperKivimaeki 🇫🇮 631 169 12ms 30 Dec 2025 445th jwhear 🇺🇸 631 373 155ms 27 Sep 2024 446th edsrzf 🇳🇿 630 154 6ms 27 Oct 2024 447th rschwa6308 🇺🇸 630 162 22ms 14 Mar 2023 448th MeWhenI 🇻🇦 630 213 10ms 13 Dec 2023 449th GalladeGuy 🇺🇸 629 203 3ms 5 Feb 2024 450th prplz 🇦🇺 629 342 27ms 28 Sep 2021 451st Shanethegamer 🇺🇸 628 389 34ms 30 Dec 2022 452nd H3XDaemon 627 165 2ms 20 Dec 2025 453rd omurakazuaki 🇯🇵 627 170 14ms 20 Feb 2021 453rd deniz-blue 627 170 15ms 21 Oct 2023 453rd spidunno 627 170 17ms 23 Feb 2026 456th jeff-at-tamer-dot-codes 🇺🇸 626 163 16ms 12 Mar 2023 457th Skepfyr 626 376 189ms 4 Jan 2020 458th Chinay-Domitrix 🇺🇸 625 291 3,332ms 12 days ago 459th ccbrown 625 313 305ms 21 Apr 2020 460th AlephSquirrel 624 235 112ms 26 Oct 2024 461st postie77 624 261 398ms 9 May 2023 462nd DialFrost 🇸🇬 623 171 14ms 25 May 2024 463rd mtirado1 623 205 3ms 17 Apr 2023 463rd DaDerpDuck 623 205 3ms 7 Nov 2023 465th pschmid0 🇺🇸 622 156 5ms 31 Aug 2022 466th jatloe 622 164 24ms 28 Oct 2024 466th RaBa21 🇭🇺 622 164 16ms 19 Jul 2025 468th AdrienHache 🇫🇷 622 262 389ms 25 Apr 2024 469th inventshah 620 172 20ms 7 May 2021 469th MathisBullinger 620 172 14ms 28 Nov 2021 469th a6166231 🇨🇳 620 172 13ms 28 Apr 2025 472nd sean-niemann 🇺🇸 620 213 68ms 3 Jun 2022 472nd Alex-x90 🇺🇸 620 213 496ms 11 Jul 2023 474th Shanethegamer 🇺🇸 619 270 483ms 3 Mar 2022 475th Natanaelel 🇸🇪 619 317 159ms 5 Dec 2025 476th abhishekg999 618 165 360ms 21 Sep 2024 477th AlephSquirrel 617 60 77ms 23 Jan 2023 478th GrayJoKing 🇦🇺 617 146 153ms 11 Aug 2024 479th wackbyte 617 207 3ms 14 Dec 2023 480th tdashroy 617 264 464ms 21 Nov 2021 First Prev 401–480 of 1,447 Next Last