The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 20 hours. Why not try and solve them ahead of time?
Number Spiral 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 Alex-x90 🇺🇸 741 150 65ms 14 Nov 2022 321st inventshah 741 150 57ms 16 Nov 2022 323rd CaedenHarper 🇨🇦 741 157 551ms 6 Oct 2025 324th sisyphus-ppcg 🇦🇺 740 85 10ms 26 Jan 2022 324th xnor-gate 740 85 10ms 27 Jan 2022 324th SirBogman 🇺🇸 740 85 10ms 20 Nov 2022 327th DialFrost 🇸🇬 740 151 111ms 2 Dec 2025 328th scpchicken 🇵🇼 739 96 3ms 14 Jun 2023 328th o0lit3 🇺🇸 739 96 3ms 15 Jun 2023 328th saito-ta 🇯🇵 739 96 3ms 4 Aug 2025 331st Babafaba 738 82 438ms 28 Nov 2025 332nd CaedenHarper 🇨🇦 738 138 402ms 19 Oct 2025 333rd KrausRaus 🇺🇸 737 110 10ms 3 Jan 2023 334th ovs-code 🇩🇪 736 151 61ms 3 Jun 2024 335th nwellnhof 🇩🇪 735 98 303ms 18 Jun 2024 336th emgordon154 734 150 125ms 27 Feb 2025 337th JohandeRuiter 🇳🇱 733 122 1ms 25 Mar 2024 338th m-tkach 🇺🇦 732 139 366ms 27 Oct 2022 339th m-tkach 🇺🇦 732 152 62ms 27 Oct 2022 340th ovs-code 🇩🇪 731 54 207ms 8 Jan 2024 341st Artemis21 🇬🇧 731 86 10ms 10 Jan 2025 341st plcc0 731 86 10ms 25 Mar 2025 343rd w911 731 176 272ms 9 Oct 2024 344th CaedenHarper 🇨🇦 730 111 10ms 29 Aug 2025 345th Re-Adventures 🇮🇳 727 123 1ms 11 Feb 2022 346th JRaspass 🇬🇧 727 177 292ms 7 Feb 2024 347th MeWhenI 🇻🇦 725 165 3ms 1 Nov 2023 348th andersk 🇺🇸 724 152 128ms 30 Oct 2022 349th emgordon154 723 112 9ms 16 Nov 2024 350th primo-ppcg 🇹🇭 723 159 15ms 16 Feb 2022 351st MeWhenI 🇻🇦 722 139 42ms 4 Sep 2024 352nd pandapawskat 721 124 1ms 29 Feb 2024 353rd ovs-code 🇩🇪 719 95 146ms 20 Nov 2024 354th Yewzir 🇧🇪 718 157 454ms 21 Dec 2023 355th DialFrost 🇸🇬 718 162 389ms 24 Sep 2025 356th dmrichwa 🇺🇸 717 113 8ms 4 Oct 2022 357th AdrienHache 🇫🇷 717 142 428ms 18 Aug 2025 358th Yewzir 🇧🇪 715 88 10ms 27 Dec 2023 359th marshallward 🇺🇸 715 123 40ms 6 May 2025 360th kallmi28 🇨🇿 715 125 1ms 9 Nov 2023 361st MeWhenI 🇻🇦 713 342 10ms 1 Aug 2023 361st janbehrens 🇩🇪 713 342 10ms 2 Aug 2023 361st frankgraziano 713 342 10ms 6 Aug 2025 361st JOrE20 713 342 10ms 16 Feb 2026 365th sisyphus-ppcg 🇦🇺 712 85 528ms 2 Sep 2024 366th primo-ppcg 🇹🇭 712 139 5ms 29 Jan 2023 367th jared-hughes 711 114 9ms 13 Feb 2023 368th stefangimmillaro 711 181 316ms 31 Aug 2023 369th scpchicken 🇵🇼 711 343 10ms 30 Jan 2022 369th KatieLG 🇬🇧 711 343 9ms 28 Sep 2024 369th BREMAUCY 🇫🇷 711 343 10ms 18 Feb 2025 372nd Shanethegamer 🇺🇸 710 150 1,348ms 7 Mar 2023 373rd dokutan 710 157 122ms 25 Jun 2024 374th SirBogman 🇺🇸 709 344 10ms 27 Mar 2022 375th Irratix 🇳🇱 708 157 438ms 15 Dec 2022 376th error256 707 89 10ms 10 Dec 2024 377th SirBogman 🇺🇸 706 102 299ms 27 Jan 2024 378th sean-niemann 🇺🇸 706 136 2,480ms 30 Oct 2024 379th verticallity 706 156 142ms 7 Apr 2022 380th nwellnhof 🇩🇪 705 56 182ms 27 Jan 2022 381st inventshah 705 139 2ms 19 Aug 2023 382nd nwellnhof 🇩🇪 705 177 5ms 10 Jul 2022 383rd error256 704 76 36ms 21 May 2025 384th primo-ppcg 🇹🇭 701 131 4ms 6 Aug 2023 385th Yewzir 🇧🇪 699 184 279ms 7 Feb 2024 386th ovs-code 🇩🇪 698 98 64ms 1 Oct 2023 387th itsh01 698 116 9ms 5 Sep 2022 388th emgordon154 696 138 2,527ms 12 Nov 2024 389th Sakisan 🇧🇪 696 142 118ms 13 Apr 2022 390th anter69 🇭🇺 695 77 34ms 12 Feb 2024 391st dokutan 695 160 59ms 1 Apr 2024 391st KasperKivimaeki 🇫🇮 695 160 68ms 27 Nov 2025 393rd KatieLG-Transpiler 🇬🇧 695 351 10ms 4 Dec 2022 393rd lynn 695 351 10ms 17 Oct 2023 395th Re-Adventures 🇮🇳 692 117 10ms 11 Feb 2022 396th m-tkach 🇺🇦 692 168 588ms 25 Sep 2025 397th btjones0 691 91 10ms 15 Jul 2022 397th firegene 🇮🇪 691 91 11ms 25 Jan 2023 399th Yewzir 🇧🇪 691 161 467ms 17 Feb 2024 400th Yewzir 🇧🇪 688 88 426ms 15 Jan 2024 First Prev 321–400 of 1,806 Next Last