The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 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 721st Natanaelel 🇸🇪 637 70 109ms 8 Oct 2021 722nd dloscutoff 637 71 277ms 27 Nov 2018 723rd KatieLG 🇬🇧 637 84 371ms 15 Jan 2024 724th stefangimmillaro 637 98 38ms 23 Aug 2024 725th MeWhenI 🇻🇦 636 69 1,074ms 15 Sep 2025 726th zdzc 635 88 9ms 8 Feb 2018 726th nstearns96 🇬🇧 635 88 10ms 8 Dec 2022 726th TaserTheFox 🇺🇸 635 88 9ms 1 May 2023 726th FortuiteMan 🇫🇷 635 88 9ms 7 Dec 2025 730th DialFrost 🇸🇬 634 201 1,456ms 8 Mar 2025 731st emgordon154 631 94 2,712ms 4 Jul 2025 732nd madeforlosers 630 76 12ms 31 Oct 2023 733rd Lydxn 🇨🇦 629 112 429ms 5 Jan 2024 733rd Shanethegamer 🇺🇸 629 112 459ms 25 Sep 2025 735th Yewzir 🇧🇪 628 72 293ms 26 May 2024 736th hrrs01 628 77 32ms 5 Feb 2018 736th FlyingPenguin223 628 77 34ms 23 Sep 2024 738th giacomogallina 628 89 16ms 12 Jun 2019 738th fynnkroeger 628 89 9ms 20 Feb 2021 738th Artemis21 🇬🇧 628 89 10ms 17 Jan 2025 738th HumanoidCPU 628 89 10ms 11 Feb 2025 738th iliao2345 628 89 10ms 8 Jul 2025 738th albanian-laundromat 628 89 9ms 11 Nov 2025 738th JOrE20 628 89 9ms 4 Jan 2026 745th emgordon154 628 121 7ms 10 Sep 2025 746th Yewzir 🇧🇪 627 108 92ms 29 Mar 2024 747th user189032 624 110 112ms 29 May 2019 748th Shanethegamer 🇺🇸 623 114 424ms 4 Apr 2022 749th Constructor7 621 90 10ms 23 Feb 2018 749th neihousaigaai 621 90 16ms 7 May 2021 749th prestosilver 🇺🇸 621 90 2ms 17 Dec 2025 749th WinterWolfSV 621 90 9ms 25 Feb 2026 749th artemetra 621 90 9ms 25 Feb 2026 754th alemelis 620 73 250ms 4 Mar 2024 755th n1LS 620 78 36ms 9 Oct 2019 756th retrohun 620 118 61ms 28 Dec 2022 757th janbehrens 🇩🇪 615 75 1,264ms 27 Nov 2022 758th MarcMush 🇫🇷 615 91 9ms 13 Jan 2022 758th SB-945 615 91 10ms 7 Apr 2024 758th RaBa21 🇭🇺 615 91 10ms 21 Jul 2025 761st MadScience137 614 78 10ms 19 Oct 2022 762nd laikoni 613 112 119ms 3 Mar 2019 763rd primo-ppcg 🇹🇭 613 115 393ms 18 Aug 2021 764th Shanethegamer 🇺🇸 612 96 147ms 2 Jul 2021 764th Yewzir 🇧🇪 612 96 145ms 3 Feb 2024 766th Shanethegamer 🇺🇸 610 70 3ms 13 Dec 2022 766th DialFrost 🇸🇬 610 70 2ms 1 Feb 2025 768th CaedenHarper 🇨🇦 609 72 916ms 7 Sep 2025 769th Shanethegamer 🇺🇸 609 126 146ms 13 Dec 2022 769th unfinishedprogram 609 126 163ms 23 Aug 2023 771st HumanoidCPU 608 88 517ms 11 Feb 2025 772nd eddvrs 608 92 10ms 21 Dec 2023 772nd coldham10 608 92 10ms 28 Jun 2025 774th emgordon154 608 106 4ms 30 Dec 2024 775th MeWhenI 🇻🇦 608 122 3ms 2 Oct 2022 776th postie77 607 106 370ms 26 Jul 2023 777th Irratix 🇳🇱 607 116 411ms 23 May 2022 778th frankgraziano 603 95 5ms 14 Feb 2026 779th SuperFola 603 205 77ms 7 days ago 780th annaproxy 602 114 119ms 6 Feb 2022 780th Sakisan 🇧🇪 602 114 116ms 12 Apr 2022 780th Shanethegamer 🇺🇸 602 114 111ms 25 Oct 2022 783rd albanian-laundromat 601 89 485ms 11 Nov 2025 784th AgathokakologicalBit 601 93 10ms 27 Jul 2019 784th stordev 601 93 10ms 26 Feb 2021 784th rak1507 🇬🇧 601 93 10ms 10 Mar 2021 784th ArmaanAS 601 93 11ms 6 Apr 2021 784th olivermrose 🇺🇸 601 93 11ms 29 Aug 2021 784th CodyMiner 601 93 10ms 14 Nov 2021 784th vodker1 601 93 9ms 7 Mar 2022 784th trist224 🇫🇷 601 93 10ms 15 Sep 2022 784th TheBlupper 601 93 11ms 24 Oct 2022 784th Eilonlif 🇮🇱 601 93 10ms 4 Nov 2022 784th MichalMarsalek 🇨🇿 601 93 10ms 21 Jan 2023 784th GolfingSuccess 🇬🇷 601 93 1ms 21 Dec 2023 784th Yewzir 🇧🇪 601 93 1ms 9 Feb 2024 784th klixel 🇨🇦 601 93 11ms 19 Jan 2025 784th agreegious 601 93 10ms 16 Mar 2025 799th Yewzir 🇧🇪 599 122 451ms 19 Nov 2023 799th qwertyuiop3 🇷🇺 599 122 445ms 28 May 2025 First Prev 721–800 of 2,101 Next Last