The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 29 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 161st Irratix 🇳🇱 853 95 10ms 29 Jan 2022 162nd GrayJoKing 🇦🇺 853 108 7ms 26 Feb 2026 163rd Steffan153 🇫🇮 852 89 861ms 21 Feb 2026 164th pardouin 🇫🇷 852 90 1,541ms 8 Aug 2025 165th scpchicken 🇵🇼 852 116 117ms 4 Feb 2023 166th NewDefectus 🇮🇱 851 105 1ms 27 Jan 2022 166th Alex-x90 🇺🇸 851 105 1ms 14 Nov 2022 166th inventshah 851 105 1ms 16 Nov 2022 166th jared-hughes 851 105 1ms 13 Feb 2023 166th xsot 🇸🇬 851 105 2ms 11 Aug 2024 171st ImpressedByRocks 850 74 10ms 26 Mar 2024 171st snoozingnewt 🇨🇦 850 74 10ms 1 Mar 2026 173rd Yewzir 🇧🇪 850 214 1,878ms 15 Nov 2025 174th pardouin 🇫🇷 849 63 36ms 13 days ago 175th Natanaelel 🇸🇪 843 91 1,393ms 24 Aug 2022 176th ovs-code 🇩🇪 842 47 39ms 15 Jun 2024 177th CaedenHarper 🇨🇦 842 90 1,056ms 9 Sep 2025 178th JayXon 🇺🇸 841 153 291ms 13 Apr 2022 179th kg583 🇺🇸 841 164 32ms 21 mins ago 180th anter69 🇭🇺 839 75 10ms 2 Sep 2022 181st RockOfStone 839 129 1ms 8 Mar 2024 182nd SirBogman 🇺🇸 838 105 40ms 3 Jun 2025 183rd m-tkach 🇺🇦 836 107 1ms 27 Oct 2022 184th Steffan153 🇫🇮 836 120 10ms 8 Mar 2023 185th snyderek 🇺🇸 836 133 65ms 1 Dec 2024 186th zacjl 835 99 9ms 21 Sep 2024 187th 386asm 🇺🇸 835 159 36ms 3 May 2023 188th jared-hughes 833 130 1ms 27 May 2022 189th DialFrost 🇸🇬 830 190 1,518ms 5 Feb 2025 190th snoozingnewt 🇨🇦 828 137 96ms 23 days ago 191st Steffan153 🇫🇮 827 76 10ms 11 Jul 2024 191st sean-niemann 🇺🇸 827 76 10ms 7 Jan 2026 193rd Yewzir 🇧🇪 826 167 4ms 8 days ago 194th sisyphus-ppcg 🇦🇺 825 93 1,400ms 26 Jan 2022 195th primo-ppcg 🇹🇭 825 102 2ms 27 Jan 2022 196th Steffan153 🇫🇮 825 120 7ms 99 mins ago 197th sean-niemann 🇺🇸 824 92 1,066ms 15 Sep 2025 198th sean-niemann 🇺🇸 823 83 131ms 21 Oct 2025 199th sisyphus-ppcg 🇦🇺 822 48 203ms 28 Jan 2022 200th sisyphus-ppcg 🇦🇺 822 72 94ms 2 Dec 2025 201st Steffan153 🇫🇮 822 90 5ms 101 mins ago 202nd xsot 🇸🇬 820 89 2ms 10 Aug 2024 203rd Irratix 🇳🇱 820 109 1ms 27 Apr 2022 203rd DialFrost 🇸🇬 820 109 1ms 6 Nov 2023 205th edsrzf 🇳🇿 820 157 265ms 26 Feb 2026 206th sean-niemann 🇺🇸 819 142 486ms 24 Sep 2025 207th primo-ppcg 🇹🇭 819 162 37ms 21 Jun 2022 208th snoozingnewt 🇨🇦 818 74 367ms 1 Mar 2026 209th primo-ppcg 🇹🇭 818 99 11ms 28 Jan 2022 210th CornerMercury 🇬🇧 817 77 11ms 21 Nov 2025 211th GrayJoKing 🇦🇺 817 138 456ms 4 Mar 2022 212th bstrat 815 37 2ms 12 Oct 2025 212th blaztoma 🇱🇹 815 37 2ms 31 Jan 2026 214th antimon2 🇯🇵 815 75 974ms 22 Oct 2024 215th kg583 🇺🇸 811 122 7ms 20 Mar 2025 216th Natanaelel 🇸🇪 808 49 43ms 3 Sep 2022 217th sean-niemann 🇺🇸 808 126 429ms 22 Apr 2024 218th dokutan 808 148 2ms 26 Dec 2025 219th m-tkach 🇺🇦 808 167 26ms 26 Jan 2022 220th sean-niemann 🇺🇸 807 75 406ms 7 Jan 2026 220th Steffan153 🇫🇮 807 75 395ms 26 Feb 2026 222nd hallvabo 🇳🇴 806 78 10ms 27 Jan 2022 222nd GrayJoKing 🇦🇺 806 78 10ms 7 Jul 2022 222nd m-tkach 🇺🇦 806 78 10ms 6 Oct 2022 222nd kg583 🇺🇸 806 78 11ms 10 Aug 2023 222nd markusgraube 806 78 10ms 14 Jun 2024 227th xnor-gate 804 123 114ms 27 Jan 2022 228th Argeento 🇵🇱 802 101 10ms 29 Oct 2023 228th ovs-code 🇩🇪 802 101 9ms 20 Nov 2024 230th sean-niemann 🇺🇸 800 139 60ms 13 May 2024 231st emgordon154 799 96 1,433ms 19 Nov 2024 232nd CaedenHarper 🇨🇦 799 161 293ms 11 Dec 2025 233rd sisyphus-ppcg 🇦🇺 798 67 69ms 8 Apr 2022 234th CaedenHarper 🇨🇦 798 112 2ms 11 Aug 2025 235th FlorianCassayre 🇫🇷 796 79 10ms 19 Sep 2023 235th neel11235813 796 79 11ms 27 Mar 2024 237th sisyphus-ppcg 🇦🇺 794 140 67ms 26 Jan 2022 238th Frowny 793 29 33ms 26 Jan 2022 239th primo-ppcg 🇹🇭 793 92 2ms 15 Nov 2022 240th emgordon154 791 116 4ms 27 Dec 2024 First Prev 161–240 of 1,800 Next Last