The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 23 hours. Why not try and solve them ahead of time?
Arrows 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 399th prplz 🇦🇺 717 80 36ms 29 Jan 2024 402nd janbehrens 🇩🇪 717 114 14ms 10 Jul 2023 402nd Andrey-Plotnikov 717 114 14ms 22 Aug 2023 402nd itserasmus 717 114 13ms 25 Jan 2024 402nd helbling 🇨🇭 717 114 13ms 8 Sep 2024 406th lynn 715 101 13ms 30 Aug 2021 407th annaproxy 714 207 165ms 28 Jul 2022 408th primo-ppcg 🇹🇭 713 152 707ms 4 Mar 2022 409th ovs-code 🇩🇪 712 93 733ms 5 Aug 2024 410th snoozingnewt 🇨🇦 712 125 497ms 10 Dec 2025 411th primo-ppcg 🇹🇭 711 121 94ms 15 Oct 2023 412th MichalMarsalek 🇨🇿 711 142 487ms 17 May 2024 413th uttumuttu 🇫🇮 710 115 16ms 6 Jan 2022 413th KatieLG 🇬🇧 710 115 13ms 13 Aug 2022 413th ToriTheChicken 710 115 15ms 30 May 2023 413th Argeento 🇵🇱 710 115 13ms 8 Sep 2023 417th lynn 709 153 719ms 23 Sep 2021 418th stefangimmillaro 708 81 52ms 28 Jan 2022 418th ovs-code 🇩🇪 708 81 36ms 9 May 2023 420th ndren 708 102 14ms 3 Aug 2025 421st dokutan 708 133 10ms 18 days ago 422nd Shanethegamer 🇺🇸 708 174 42ms 2 Sep 2021 423rd Sp3000 🇦🇺 707 66 3ms 4 Nov 2021 424th 386asm 🇺🇸 706 134 44ms 7 May 2023 425th Waffle3z 705 115 2ms 2 Sep 2021 426th iliazeus 704 116 15ms 4 Sep 2022 426th unfinishedprogram 704 116 14ms 26 Oct 2023 426th CaedenHarper 🇨🇦 704 116 11ms 23 Aug 2025 429th alphafalfa 703 91 3ms 20 Nov 2024 430th annaproxy 701 103 14ms 29 Nov 2022 430th commandz0 🇺🇸 701 103 13ms 22 Aug 2023 430th Seek64 🇩🇪 701 103 10ms 19 Sep 2024 430th edsrzf 🇳🇿 701 103 20ms 19 Feb 2026 434th GrayJoKing 🇦🇺 699 116 2ms 30 Nov 2022 435th dokutan 698 146 63ms 6 Nov 2025 436th Pimentero 🇷🇺 697 114 7ms 10 Nov 2022 437th albanian-laundromat 697 174 3ms 19 Dec 2025 438th MeWhenI 🇻🇦 696 185 35ms 7 Jun 2023 439th blaztoma 🇱🇹 695 104 30ms 8 days ago 440th albanian-laundromat 695 106 2,143ms 29 Sep 2025 441st dokutan 694 146 524ms 7 Nov 2025 442nd 4very 692 118 12ms 10 Jun 2025 442nd tetrogem 692 118 12ms 23 Aug 2025 442nd snoozingnewt 🇨🇦 692 118 14ms 10 Dec 2025 445th edsrzf 🇳🇿 692 135 5ms 19 Feb 2026 446th jgbaldwinbrown 692 175 393ms 21 Jul 2022 447th emgordon154 691 98 175ms 3 Mar 2025 448th revlayle 🇺🇸 690 129 529ms 6 Jun 2023 449th AlephSquirrel 690 133 4ms 6 Aug 2024 450th snoozingnewt 🇨🇦 690 161 122ms 20 Nov 2025 451st primo-ppcg 🇹🇭 688 105 12ms 4 Mar 2022 452nd Lv0Sys 🇵🇱 688 176 393ms 28 Feb 2026 453rd emgordon154 686 51 52ms 16 Nov 2025 454th DialFrost 🇸🇬 686 119 13ms 28 Sep 2023 454th CarsonChr 🇺🇸 686 119 13ms 6 Apr 2024 456th dokutan 686 158 691ms 21 Feb 2026 457th bbakersmith 684 128 16ms 7 Jun 2022 458th Kacarott 🇦🇺 683 126 85ms 9 Dec 2025 459th AlephSquirrel 682 97 739ms 21 Jan 2024 459th m-tkach 🇺🇦 682 97 647ms 29 Jan 2024 459th MeWhenI 🇻🇦 682 97 676ms 24 May 2024 462nd stefangimmillaro 682 106 13ms 12 Mar 2022 462nd emplv 🇱🇻 682 106 15ms 16 Nov 2022 462nd AlephSquirrel 682 106 12ms 27 May 2023 465th dokutan 682 108 2,344ms 17 Dec 2025 466th two-bad 🇬🇧 681 120 14ms 7 Feb 2024 467th ShiraJoseph 🇺🇸 675 121 14ms 7 May 2022 468th AdrienHache 🇫🇷 675 132 487ms 30 Dec 2024 469th stefangimmillaro 673 118 6ms 6 Sep 2022 470th stefangabos 🇷🇴 670 122 12ms 15 Sep 2022 470th weliveinhell 🇭🇹 670 122 14ms 2 Oct 2023 472nd Yewzir 🇧🇪 669 108 14ms 15 Feb 2024 473rd Shanethegamer 🇺🇸 669 131 1,022ms 10 Dec 2021 474th snoozingnewt 🇨🇦 667 137 156ms 10 Dec 2025 475th stefangimmillaro 666 185 41ms 26 Apr 2025 476th prplz 🇦🇺 665 163 687ms 25 Sep 2021 477th galloj 🇨🇿 665 217 8ms 22 Apr 2024 478th MeWhenI 🇻🇦 664 111 2,024ms 29 Aug 2025 478th CaedenHarper 🇨🇦 664 111 1,989ms 16 Oct 2025 480th targrik 664 123 15ms 20 Mar 2025 First Prev 401–480 of 1,317 Next Last
