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 881st emgordon154 561 181 1,666ms 3 Jun 2025 882nd galloj 🇨🇿 559 94 1ms 30 Aug 2022 883rd max-the-mage 559 100 9ms 29 Oct 2020 883rd celiendonze 🇨🇭 559 100 10ms 26 Jun 2023 883rd cingulataluke 559 100 10ms 26 Aug 2023 883rd weliveinhell 🇭🇹 559 100 10ms 2 Oct 2024 883rd 5quiwyrm 559 100 9ms 11 Feb 2025 888th Yewzir 🇧🇪 558 122 36ms 29 Mar 2024 889th elisherer 🇮🇱 557 80 120ms 13 Apr 2019 889th o0lit3 🇺🇸 557 80 115ms 10 Jul 2020 889th rucin93 🇵🇱 557 80 108ms 7 Sep 2020 889th olivermrose 🇺🇸 557 80 110ms 20 Sep 2021 889th trist224 🇫🇷 557 80 110ms 28 Nov 2022 889th retrohun 557 80 119ms 30 Dec 2022 889th neel11235813 557 80 117ms 3 Feb 2023 889th JRaspass 🇬🇧 557 80 122ms 22 Feb 2023 889th DialFrost 🇸🇬 557 80 110ms 26 Nov 2023 898th JOrE20 557 86 10ms 4 Jan 2026 899th revlayle 🇺🇸 555 116 366ms 10 Dec 2022 900th DialFrost 🇸🇬 555 128 583ms 8 Jun 2024 901st janbehrens 🇩🇪 555 130 125ms 17 Jun 2021 902nd CaedenHarper 🇨🇦 554 64 40ms 10 days ago 903rd Psirving 554 101 9ms 1 Aug 2020 903rd vezzick 554 101 10ms 12 Mar 2021 903rd quimey 554 101 10ms 5 Jul 2023 903rd Techdude01 554 101 9ms 21 Dec 2023 903rd croc54 554 101 9ms 13 Dec 2024 903rd firegene 🇮🇪 554 101 11ms 13 Feb 2026 909th Shanethegamer 🇺🇸 554 230 1,443ms 24 Apr 2025 910th MeWhenI 🇻🇦 552 113 40ms 11 Jun 2023 911th DialFrost 🇸🇬 551 89 4ms 28 Nov 2023 912th mcreenan 550 81 115ms 6 Apr 2018 913th dokutan 550 133 61ms 21 Jun 2025 914th Yewzir 🇧🇪 549 80 937ms 16 Nov 2025 915th olligobber 🇦🇺 549 125 115ms 18 May 2020 916th mosho-p 548 102 2,553ms 13 Oct 2022 916th za3k 548 102 9ms 16 Oct 2022 916th Jacob385 548 102 10ms 14 Mar 2024 916th maxgodfrey2004 🇨🇦 548 102 10ms 14 Feb 2025 916th qwertyuiop3 🇷🇺 548 102 1ms 27 May 2025 916th RYSF13 🇨🇳 548 102 9ms 18 Jul 2025 922nd dokutan 548 285 6ms 12 Jan 2024 923rd bstrautin 547 88 256ms 10 Jun 2020 924th varhammer 547 138 5ms 3 Jan 2022 925th ridingqwerty 🇺🇸 546 98 503ms 22 Jan 2024 925th dokutan 546 98 522ms 15 May 2024 927th Mabeloid 🇳🇴 546 119 1ms 22 Sep 2024 928th Mandrzejy 🇵🇱 546 134 437ms 25 Mar 2024 929th emgordon154 546 206 2ms 23 May 2025 930th tobeannouncd 545 126 116ms 12 Jan 2024 931st KatieLG 🇬🇧 544 207 2ms 17 May 2025 932nd grondilu 543 82 112ms 1 Sep 2023 933rd DialFrost 🇸🇬 543 102 2ms 5 Nov 2023 933rd HumanoidCPU 543 102 2ms 2 Jun 2024 933rd albanian-laundromat 543 102 6ms 16 Nov 2025 936th RYNO8 543 103 10ms 11 Sep 2021 936th jeff-at-tamer-dot-codes 🇺🇸 543 103 10ms 13 Mar 2023 936th countlpaul-dotcom 543 103 9ms 19 Oct 2025 939th xyangst 538 89 9ms 18 Oct 2024 939th emgordon154 538 89 9ms 3 Jun 2025 941st Shanethegamer 🇺🇸 538 91 4ms 26 Oct 2022 942nd abailey2020 🇺🇸 538 104 9ms 13 Dec 2020 942nd karhuthebear 538 104 9ms 6 May 2022 942nd Just4FunCoder 538 104 10ms 27 Nov 2022 942nd SirFireball3521 538 104 10ms 2 Mar 2023 942nd inverseLorentz 🇦🇺 538 104 10ms 23 Apr 2024 947th janbehrens 🇩🇪 538 131 426ms 28 Nov 2023 948th janbehrens 🇩🇪 537 83 103ms 20 Jun 2021 949th c0d3-4-F00d 🇩🇪 537 104 2ms 11 Nov 2021 950th albanian-laundromat 535 82 962ms 16 Nov 2025 951st mhasch 534 80 3ms 10 Oct 2017 952nd MeWhenI 🇻🇦 533 60 2ms 19 Jan 2022 953rd zuparnowa 533 105 9ms 31 Jan 2019 953rd henrytranter 533 105 10ms 20 Sep 2019 953rd doug-h 533 105 10ms 26 May 2020 953rd 77Tigers 533 105 10ms 4 Feb 2021 953rd tpasfieldERAU 533 105 9ms 4 Nov 2022 958th Natanaelel 🇸🇪 533 121 3ms 10 Jul 2023 959th rambox11 532 90 12ms 17 Jun 2018 959th frobinsonj 532 90 11ms 28 Jun 2018 First Prev 881–960 of 2,102 Next Last