The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 24 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 241st emgordon154 791 116 4ms 27 Dec 2024 242nd kg583 🇺🇸 791 128 48ms 20 Mar 2025 243rd snoozingnewt 🇨🇦 791 140 109ms 21 Nov 2025 244th namelessiw 789 129 417ms 26 Jul 2025 245th ovs-code 🇩🇪 789 143 444ms 4 Mar 2022 245th DialFrost 🇸🇬 789 143 477ms 21 Dec 2023 247th Lydxn 🇨🇦 787 68 33ms 16 Aug 2022 248th Kacarott 🇦🇺 787 87 67ms 13 Sep 2024 249th NewDefectus 🇮🇱 787 103 9ms 28 Jan 2022 249th akshatj27 🇦🇶 787 103 10ms 28 Jan 2022 251st clockworknazo 787 152 3ms 12 Jul 2023 252nd kg583 🇺🇸 786 77 406ms 20 Feb 2024 253rd zacjl 786 80 9ms 20 Apr 2023 253rd emgordon154 786 80 10ms 12 Apr 2025 255th acotis 786 140 142ms 26 Sep 2025 256th emgordon154 784 114 2ms 7 Feb 2026 257th MarcMush 🇫🇷 783 78 1,277ms 7 Jan 2024 258th emgordon154 783 144 518ms 1 Dec 2025 259th GolfingSuccess 🇬🇷 780 110 2ms 19 Nov 2023 260th primo-ppcg 🇹🇭 780 173 25ms 10 Mar 2022 261st Yewzir 🇧🇪 779 127 6ms 23 Jan 2025 262nd stefangimmillaro 778 141 2ms 9 Sep 2022 262nd KatieLG 🇬🇧 778 141 2ms 28 Sep 2025 264th Yewzir 🇧🇪 777 115 1ms 17 Feb 2024 264th gastropner 777 115 1ms 14 Jul 2025 266th SmartK8 🇨🇿 777 131 404ms 30 Oct 2022 266th tomtheisen 🇺🇸 777 131 375ms 19 Jan 2023 268th GrayJoKing 🇦🇺 776 78 428ms 23 Jul 2024 269th Yax42 🇫🇷 776 150 382ms 13 Jan 2026 270th dokutan 776 171 37ms 15 Jun 2024 271st SirBogman 🇺🇸 774 51 203ms 4 Apr 2022 272nd DialFrost 🇸🇬 774 79 1,663ms 14 Jan 2024 273rd DialFrost 🇸🇬 774 98 1,495ms 1 Sep 2025 273rd edsrzf 🇳🇿 774 98 1,072ms 23 Nov 2025 275th Waffle3z 773 140 2ms 8 Apr 2022 276th dylanarmstrong 772 105 8ms 17 Jan 2024 277th aksyristos 771 116 2ms 8 Dec 2022 277th GolfingSuccess 🇬🇷 771 116 1ms 19 Nov 2023 277th HumanoidCPU 771 116 1ms 29 Aug 2024 280th sean-niemann 🇺🇸 769 115 5ms 17 Feb 2025 281st HumanoidCPU 768 141 2ms 24 Dec 2025 282nd Babafaba 767 82 11ms 28 Nov 2025 283rd zacjl 766 79 407ms 5 Oct 2024 283rd emgordon154 766 79 441ms 12 Apr 2025 285th GrayJoKing 🇦🇺 766 102 77ms 1 Nov 2023 286th rucin93 🇵🇱 766 112 2ms 18 Nov 2025 287th JayXon 🇺🇸 764 70 36ms 1 Mar 2023 288th DialFrost 🇸🇬 763 140 107ms 17 Nov 2023 289th ovs-code 🇩🇪 762 207 1,429ms 4 Feb 2025 290th Yax42 🇫🇷 760 134 439ms 13 Jan 2026 291st lynn 759 145 138ms 7 Jul 2024 292nd m-tkach 🇺🇦 759 147 308ms 1 Aug 2023 293rd annaproxy 758 83 10ms 29 Jan 2022 293rd QuincyNash 🇺🇸 758 83 10ms 29 Nov 2022 295th emgordon154 756 98 31ms 22 days ago 296th xsot 🇸🇬 756 117 4ms 20 May 2025 297th namelessiw 755 154 513ms 15 Nov 2025 298th emgordon154 754 40 2ms 15 days ago 299th stefangimmillaro 752 102 1,431ms 30 Dec 2024 300th DialFrost 🇸🇬 752 114 2ms 26 Jan 2024 301st UnderKoen 🇳🇱 752 198 2ms 29 Jan 2024 302nd RYNO8 751 119 1ms 25 Aug 2023 303rd DialFrost 🇸🇬 751 151 111ms 2 Dec 2025 304th voytxt 🇨🇿 750 108 9ms 26 Jan 2025 305th edsrzf 🇳🇿 750 135 43ms 21 hours ago 306th Irratix 🇳🇱 749 84 10ms 7 May 2022 306th ndren 749 84 10ms 25 Jul 2025 308th Yewzir 🇧🇪 749 147 135ms 21 Dec 2023 309th voytxt 🇨🇿 747 211 1,446ms 26 Jan 2025 310th edsrzf 🇳🇿 746 123 5ms 26 Feb 2026 311th jared-hughes 746 149 462ms 13 Feb 2023 312th c0d3-4-F00d 🇩🇪 745 120 1ms 11 Feb 2022 313th primo-ppcg 🇹🇭 744 92 62ms 21 Sep 2023 314th edsrzf 🇳🇿 744 133 6ms 2 days ago 315th janlelis 743 72 39ms 21 Sep 2024 315th sean-niemann 🇺🇸 743 72 34ms 30 Dec 2025 317th Yewzir 🇧🇪 743 109 10ms 27 Dec 2023 317th helbling 🇨🇭 743 109 9ms 16 May 2024 319th DialFrost 🇸🇬 741 146 1ms 17 Nov 2023 320th Alex-x90 🇺🇸 741 150 65ms 14 Nov 2022 First Prev 241–320 of 1,804 Next Last