The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. 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 161st pardouin 🇫🇷 852 90 1,541ms 8 Aug 2025 162nd scpchicken 🇵🇼 852 116 117ms 4 Feb 2023 163rd NewDefectus 🇮🇱 851 105 1ms 27 Jan 2022 163rd Alex-x90 🇺🇸 851 105 1ms 14 Nov 2022 163rd inventshah 851 105 1ms 16 Nov 2022 163rd jared-hughes 851 105 1ms 13 Feb 2023 163rd xsot 🇸🇬 851 105 2ms 11 Aug 2024 168th ImpressedByRocks 850 74 10ms 26 Mar 2024 168th snoozingnewt 🇨🇦 850 74 10ms 27 days ago 170th GrayJoKing 🇦🇺 850 108 7ms 26 Feb 2026 171st Yewzir 🇧🇪 850 214 1,878ms 15 Nov 2025 172nd pardouin 🇫🇷 849 63 36ms 11 days ago 173rd Natanaelel 🇸🇪 843 91 1,393ms 24 Aug 2022 174th zacjl 843 99 9ms 21 Sep 2024 175th ovs-code 🇩🇪 842 47 39ms 15 Jun 2024 176th CaedenHarper 🇨🇦 842 90 1,056ms 9 Sep 2025 177th ovs-code 🇩🇪 841 103 4ms 4 Oct 2024 178th JayXon 🇺🇸 841 153 291ms 13 Apr 2022 179th anter69 🇭🇺 839 75 10ms 2 Sep 2022 180th RockOfStone 839 129 1ms 8 Mar 2024 181st SirBogman 🇺🇸 838 105 40ms 3 Jun 2025 182nd m-tkach 🇺🇦 836 107 1ms 27 Oct 2022 183rd Steffan153 🇫🇮 836 120 10ms 8 Mar 2023 184th snyderek 🇺🇸 835 133 65ms 1 Dec 2024 185th 386asm 🇺🇸 835 159 36ms 3 May 2023 186th jared-hughes 833 130 1ms 27 May 2022 187th kg583 🇺🇸 832 166 49ms 12 days ago 188th DialFrost 🇸🇬 830 190 1,518ms 5 Feb 2025 189th snoozingnewt 🇨🇦 828 137 96ms 22 days ago 190th Steffan153 🇫🇮 827 76 10ms 11 Jul 2024 190th sean-niemann 🇺🇸 827 76 10ms 7 Jan 2026 192nd Yewzir 🇧🇪 827 167 4ms 6 days ago 193rd sisyphus-ppcg 🇦🇺 825 93 1,400ms 26 Jan 2022 194th primo-ppcg 🇹🇭 825 102 2ms 27 Jan 2022 195th sean-niemann 🇺🇸 824 92 1,066ms 15 Sep 2025 196th sean-niemann 🇺🇸 823 83 131ms 21 Oct 2025 197th sisyphus-ppcg 🇦🇺 822 72 94ms 2 Dec 2025 198th xsot 🇸🇬 820 89 2ms 10 Aug 2024 199th Irratix 🇳🇱 820 109 1ms 27 Apr 2022 199th DialFrost 🇸🇬 820 109 1ms 6 Nov 2023 201st edsrzf 🇳🇿 820 157 265ms 26 Feb 2026 202nd sean-niemann 🇺🇸 819 142 486ms 24 Sep 2025 202nd Steffan153 🇫🇮 819 142 378ms 11 Feb 2026 204th primo-ppcg 🇹🇭 819 162 37ms 21 Jun 2022 205th snoozingnewt 🇨🇦 818 74 367ms 27 days ago 206th primo-ppcg 🇹🇭 818 99 11ms 28 Jan 2022 207th Steffan153 🇫🇮 818 121 6ms 22 Feb 2024 208th CornerMercury 🇬🇧 817 77 11ms 21 Nov 2025 209th GrayJoKing 🇦🇺 817 138 456ms 4 Mar 2022 210th bstrat 815 37 2ms 12 Oct 2025 210th blaztoma 🇱🇹 815 37 2ms 31 Jan 2026 212th antimon2 🇯🇵 815 75 974ms 22 Oct 2024 213th kg583 🇺🇸 811 122 6ms 20 Mar 2025 214th Natanaelel 🇸🇪 808 49 43ms 3 Sep 2022 215th SirBogman 🇺🇸 808 51 175ms 4 Apr 2022 216th sean-niemann 🇺🇸 808 126 429ms 22 Apr 2024 217th dokutan 808 148 2ms 26 Dec 2025 218th m-tkach 🇺🇦 808 167 26ms 26 Jan 2022 219th sean-niemann 🇺🇸 807 75 406ms 7 Jan 2026 219th Steffan153 🇫🇮 807 75 395ms 26 Feb 2026 221st hallvabo 🇳🇴 806 78 10ms 27 Jan 2022 221st GrayJoKing 🇦🇺 806 78 10ms 7 Jul 2022 221st m-tkach 🇺🇦 806 78 10ms 6 Oct 2022 221st kg583 🇺🇸 806 78 11ms 10 Aug 2023 221st markusgraube 806 78 10ms 14 Jun 2024 226th xnor-gate 804 123 114ms 27 Jan 2022 227th Argeento 🇵🇱 802 101 10ms 29 Oct 2023 227th ovs-code 🇩🇪 802 101 9ms 20 Nov 2024 229th emgordon154 799 96 1,433ms 19 Nov 2024 230th sean-niemann 🇺🇸 799 139 60ms 13 May 2024 231st CaedenHarper 🇨🇦 799 161 293ms 11 Dec 2025 232nd sisyphus-ppcg 🇦🇺 798 67 69ms 8 Apr 2022 233rd CaedenHarper 🇨🇦 798 112 2ms 11 Aug 2025 234th FlorianCassayre 🇫🇷 796 79 10ms 19 Sep 2023 234th neel11235813 796 79 11ms 27 Mar 2024 236th sisyphus-ppcg 🇦🇺 794 140 67ms 26 Jan 2022 237th Frowny 793 29 33ms 26 Jan 2022 238th primo-ppcg 🇹🇭 793 92 2ms 15 Nov 2022 239th emgordon154 791 116 4ms 27 Dec 2024 240th snoozingnewt 🇨🇦 791 140 109ms 21 Nov 2025 First Prev 161–240 of 1,769 Next Last