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?
Sierpiński Triangle in all languages in bytes. 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 Bytes Time Submitted 161st Steffan153 🇫🇮 915 83 8ms 11 Feb 2026 162nd ngn 🇧🇬 914 35 2ms 13 Jan 2022 162nd 4hg 🇺🇸 914 35 34ms 21 Jul 2023 162nd 2bular 914 35 2ms 20 Jul 2025 165th primo-ppcg 🇹🇭 914 78 64ms 5 Apr 2025 166th nwellnhof 🇩🇪 913 108 281ms 29 Nov 2021 167th primo-ppcg 🇹🇭 912 53 35ms 5 Jun 2021 168th AlephSquirrel 910 83 6ms 6 Oct 2024 169th primo-ppcg 🇹🇭 909 39 39ms 8 Dec 2022 170th Ripick 909 53 273ms 4 Sep 2023 171st Steffan153 🇫🇮 909 76 75ms 22 Feb 2024 172nd GrayJoKing 🇦🇺 909 78 3ms 17 Jul 2023 173rd canissimia 🇦🇶 909 127 2ms 19 May 2022 174th Steffan153 🇫🇮 908 71 4ms 21 Feb 2024 175th btnlq 907 57 3ms 29 Aug 2024 176th primo-ppcg 🇹🇭 907 71 372ms 21 Nov 2021 176th Irratix 🇳🇱 907 71 369ms 23 May 2022 178th Steffan153 🇫🇮 907 77 40ms 13 Feb 2026 179th nwellnhof 🇩🇪 906 58 3ms 4 Jan 2026 180th Lydxn 🇨🇦 906 59 502ms 16 Jan 2024 181st xsot 🇸🇬 906 60 2ms 21 Jun 2025 182nd JayXon 🇺🇸 905 50 379ms 28 Jan 2023 183rd primo-ppcg 🇹🇭 905 74 98ms 20 Jan 2020 183rd MeWhenI 🇻🇦 905 74 102ms 27 Feb 2023 185th Steffan153 🇫🇮 905 98 25ms 5 Aug 2024 186th MeWhenI 🇻🇦 904 84 8ms 12 Dec 2023 187th GrayJoKing 🇦🇺 903 71 7ms 7 days ago 187th edsrzf 🇳🇿 903 71 6ms 4 days ago 189th sean-niemann 🇺🇸 903 72 1ms 19 Dec 2023 190th GrayJoKing 🇦🇺 903 79 61ms 9 Dec 2025 191st NewDefectus 🇮🇱 902 46 54ms 26 Jun 2021 192nd btnlq 902 62 10ms 23 Sep 2021 192nd hallvabo 🇳🇴 902 62 11ms 23 Sep 2021 192nd bricknellj 902 62 10ms 5 Dec 2022 192nd kg583 🇺🇸 902 62 10ms 15 Nov 2023 192nd ovs-code 🇩🇪 902 62 10ms 18 Nov 2023 192nd DialFrost 🇸🇬 902 62 10ms 23 Nov 2023 192nd 5cw 🇺🇸 902 62 10ms 31 Dec 2023 192nd lifthrasiir 🇰🇷 902 62 9ms 20 Nov 2024 192nd emgordon154 902 62 9ms 10 Sep 2025 192nd davecame 902 62 11ms 13 Nov 2025 192nd bizy-coder 902 62 10ms 8 Dec 2025 203rd Steffan153 🇫🇮 902 63 131ms 3 Aug 2024 203rd sean-niemann 🇺🇸 902 63 169ms 7 Aug 2024 203rd rucin93 🇵🇱 902 63 137ms 12 Dec 2024 206th sean-niemann 🇺🇸 901 69 81ms 17 Nov 2023 206th Steffan153 🇫🇮 901 69 80ms 21 Feb 2024 208th Lydxn 🇨🇦 900 68 15ms 5 Feb 2023 209th orthoplex 🇨🇽 900 125 2ms 25 Jun 2023 210th primo-ppcg 🇹🇭 899 84 8ms 5 Jun 2021 211th primo-ppcg 🇹🇭 899 119 24ms 25 Jul 2021 212th primo-ppcg 🇹🇭 896 76 37ms 15 Jun 2022 213th sean-niemann 🇺🇸 896 110 284ms 1 Nov 2025 214th Steffan153 🇫🇮 894 83 3ms 4 Jul 2024 215th sean-niemann 🇺🇸 894 85 8ms 18 Aug 2025 216th kumavale 893 86 135ms 9 Jan 2026 217th rucin93 🇵🇱 892 79 434ms 24 Sep 2025 217th KasperKivimaeki 🇫🇮 892 79 462ms 1 Dec 2025 219th duckyluuk 🇳🇱 892 86 7ms 26 Jun 2025 220th MeWhenI 🇻🇦 892 96 8ms 23 Mar 2024 221st Natanaelel 🇸🇪 891 77 113ms 13 Apr 2025 222nd JayXon 🇺🇸 891 114 1,770ms 22 Apr 2024 222nd kcinnu 🇱🇹 891 114 1,728ms 15 May 2024 224th Bubbler-4 889 36 2ms 13 Jan 2022 224th SirBogman 🇺🇸 889 36 2ms 16 Mar 2022 224th ashtraypettingzoo 🇺🇸 889 36 34ms 23 Feb 2023 227th o0lit3 🇺🇸 889 48 3ms 18 Sep 2020 227th GrayJoKing 🇦🇺 889 48 3ms 22 Jan 2023 227th scpchicken 🇵🇼 889 48 3ms 22 Jan 2023 230th Irratix 🇳🇱 888 63 18ms 23 May 2022 230th sisyphus-ppcg 🇦🇺 888 63 10ms 22 Jan 2023 230th rucin93 🇵🇱 888 63 17ms 17 Jul 2025 230th edsrzf 🇳🇿 888 63 11ms 7 days ago 234th MeWhenI 🇻🇦 886 80 3ms 15 Jul 2023 235th primo-ppcg 🇹🇭 886 127 2ms 2 Oct 2020 236th Steffan153 🇫🇮 884 93 113ms 27 Feb 2026 237th sean-niemann 🇺🇸 882 87 134ms 5 Feb 2026 238th ovs-code 🇩🇪 880 78 113ms 9 Jan 2026 239th MeWhenI 🇻🇦 880 82 122ms 17 Nov 2022 240th Steffan153 🇫🇮 880 112 277ms 21 Feb 2024 First Prev 161–240 of 2,102 Next Last