The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 15 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 240th neel11235813 796 79 11ms 27 Mar 2024 242nd edsrzf 🇳🇿 796 172 36ms 9 hours ago 243rd sisyphus-ppcg 🇦🇺 794 140 67ms 26 Jan 2022 244th Frowny 793 29 33ms 26 Jan 2022 245th primo-ppcg 🇹🇭 793 92 2ms 15 Nov 2022 246th emgordon154 791 116 4ms 27 Dec 2024 247th snoozingnewt 🇨🇦 791 140 109ms 21 Nov 2025 248th namelessiw 789 129 417ms 26 Jul 2025 249th ovs-code 🇩🇪 789 143 444ms 4 Mar 2022 249th DialFrost 🇸🇬 789 143 477ms 21 Dec 2023 251st clockworknazo 789 152 3ms 12 Jul 2023 252nd Lydxn 🇨🇦 787 68 33ms 16 Aug 2022 253rd Kacarott 🇦🇺 787 87 67ms 13 Sep 2024 254th NewDefectus 🇮🇱 787 103 9ms 28 Jan 2022 254th akshatj27 🇦🇶 787 103 10ms 28 Jan 2022 256th kg583 🇺🇸 786 77 406ms 20 Feb 2024 257th zacjl 786 80 9ms 20 Apr 2023 257th emgordon154 786 80 10ms 12 Apr 2025 259th acotis 786 140 142ms 26 Sep 2025 260th emgordon154 784 114 2ms 7 Feb 2026 261st kg583 🇺🇸 784 128 48ms 20 Mar 2025 262nd MarcMush 🇫🇷 783 78 1,277ms 7 Jan 2024 263rd emgordon154 783 144 518ms 1 Dec 2025 264th edsrzf 🇳🇿 781 97 797ms 99 mins ago 265th GolfingSuccess 🇬🇷 780 110 2ms 19 Nov 2023 266th primo-ppcg 🇹🇭 780 173 25ms 10 Mar 2022 267th Yewzir 🇧🇪 779 127 6ms 23 Jan 2025 268th stefangimmillaro 778 141 2ms 9 Sep 2022 268th KatieLG 🇬🇧 778 141 2ms 28 Sep 2025 270th Yewzir 🇧🇪 777 115 1ms 17 Feb 2024 270th gastropner 777 115 1ms 14 Jul 2025 272nd SmartK8 🇨🇿 777 131 404ms 30 Oct 2022 272nd tomtheisen 🇺🇸 777 131 375ms 19 Jan 2023 274th GrayJoKing 🇦🇺 776 78 428ms 23 Jul 2024 275th Yax42 🇫🇷 776 150 382ms 13 Jan 2026 276th dokutan 776 171 37ms 15 Jun 2024 277th SirBogman 🇺🇸 774 51 203ms 4 Apr 2022 278th DialFrost 🇸🇬 774 79 1,663ms 14 Jan 2024 279th DialFrost 🇸🇬 774 98 1,495ms 1 Sep 2025 280th Waffle3z 773 140 2ms 8 Apr 2022 281st dylanarmstrong 772 105 8ms 17 Jan 2024 282nd aksyristos 771 116 2ms 8 Dec 2022 282nd GolfingSuccess 🇬🇷 771 116 1ms 19 Nov 2023 282nd HumanoidCPU 771 116 1ms 29 Aug 2024 285th sean-niemann 🇺🇸 769 115 5ms 17 Feb 2025 286th HumanoidCPU 768 141 2ms 24 Dec 2025 287th Babafaba 767 82 11ms 28 Nov 2025 288th zacjl 766 79 407ms 5 Oct 2024 288th emgordon154 766 79 441ms 12 Apr 2025 290th rucin93 🇵🇱 766 112 2ms 18 Nov 2025 291st JayXon 🇺🇸 764 70 36ms 1 Mar 2023 292nd DialFrost 🇸🇬 763 140 107ms 17 Nov 2023 293rd Yax42 🇫🇷 760 134 439ms 13 Jan 2026 294th lynn 759 145 138ms 7 Jul 2024 295th m-tkach 🇺🇦 759 147 308ms 1 Aug 2023 296th annaproxy 758 83 10ms 29 Jan 2022 296th QuincyNash 🇺🇸 758 83 10ms 29 Nov 2022 298th ovs-code 🇩🇪 758 207 1,429ms 4 Feb 2025 299th emgordon154 756 98 31ms 22 days ago 300th xsot 🇸🇬 756 117 4ms 20 May 2025 301st namelessiw 756 154 513ms 15 Nov 2025 302nd emgordon154 754 40 2ms 15 days ago 303rd stefangimmillaro 752 102 1,431ms 30 Dec 2024 304th DialFrost 🇸🇬 752 114 2ms 26 Jan 2024 305th UnderKoen 🇳🇱 752 198 2ms 29 Jan 2024 306th RYNO8 751 119 1ms 25 Aug 2023 307th voytxt 🇨🇿 750 108 9ms 26 Jan 2025 308th Irratix 🇳🇱 749 84 10ms 7 May 2022 308th ndren 749 84 10ms 25 Jul 2025 310th GrayJoKing 🇦🇺 749 102 77ms 1 Nov 2023 311th Yewzir 🇧🇪 749 147 135ms 21 Dec 2023 312th edsrzf 🇳🇿 746 123 5ms 26 Feb 2026 313th jared-hughes 746 149 462ms 13 Feb 2023 314th c0d3-4-F00d 🇩🇪 745 120 1ms 11 Feb 2022 315th primo-ppcg 🇹🇭 744 92 62ms 21 Sep 2023 316th edsrzf 🇳🇿 744 133 6ms 3 days ago 317th janlelis 743 72 39ms 21 Sep 2024 317th sean-niemann 🇺🇸 743 72 34ms 30 Dec 2025 319th Yewzir 🇧🇪 743 109 10ms 27 Dec 2023 319th helbling 🇨🇭 743 109 9ms 16 May 2024 First Prev 241–320 of 1,808 Next Last