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 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 721st MeWhenI 🇻🇦 635 87 4ms 18 Nov 2023 722nd Shanethegamer 🇺🇸 634 85 1ms 4 Jan 2022 722nd elgan65536 🇺🇸 634 85 2ms 24 Oct 2023 724th Shanethegamer 🇺🇸 634 116 5ms 30 Aug 2024 725th verticallity 634 118 155ms 7 Apr 2022 726th janbehrens 🇩🇪 632 67 288ms 9 Nov 2021 727th Lydxn 🇨🇦 631 110 407ms 31 Oct 2021 727th Shanethegamer 🇺🇸 631 110 459ms 25 Sep 2025 729th DialFrost 🇸🇬 631 199 1,456ms 8 Mar 2025 730th Shanethegamer 🇺🇸 630 103 103ms 26 Mar 2022 731st stefangimmillaro 629 96 38ms 23 Aug 2024 732nd user189032 629 106 112ms 29 May 2019 733rd alexsave 628 73 10ms 4 Dec 2025 733rd Lv0Sys 🇵🇱 628 73 10ms 20 Feb 2026 735th MeWhenI 🇻🇦 625 67 1,074ms 15 Sep 2025 736th namelessiw 625 78 462ms 6 May 2024 737th geofft 623 85 10ms 12 Dec 2020 737th programjames 623 85 10ms 7 May 2022 739th emgordon154 623 92 2,712ms 4 Jul 2025 740th madeforlosers 620 74 12ms 31 Oct 2023 741st zdzc 616 86 9ms 8 Feb 2018 741st Constructor7 616 86 10ms 23 Feb 2018 741st nstearns96 🇬🇧 616 86 10ms 8 Dec 2022 741st TaserTheFox 🇺🇸 616 86 9ms 1 May 2023 741st FortuiteMan 🇫🇷 616 86 9ms 7 Dec 2025 746th Shanethegamer 🇺🇸 616 112 424ms 4 Apr 2022 747th dloscutoff 614 69 277ms 27 Nov 2018 748th primo-ppcg 🇹🇭 614 113 393ms 18 Aug 2021 749th emgordon154 614 119 7ms 10 Sep 2025 750th Yewzir 🇧🇪 613 106 92ms 29 Mar 2024 751st retrohun 613 116 61ms 28 Dec 2022 752nd MeWhenI 🇻🇦 612 49 34ms 28 Nov 2021 753rd prestosilver 🇺🇸 612 88 2ms 17 Dec 2025 754th galloj 🇨🇿 611 80 1ms 30 Aug 2022 755th HumanoidCPU 610 73 34ms 2 Jun 2024 756th giacomogallina 609 87 16ms 12 Jun 2019 756th fynnkroeger 609 87 9ms 20 Feb 2021 756th jacklynnepenick 609 87 10ms 26 Aug 2021 756th iliao2345 609 87 10ms 8 Jul 2025 756th JOrE20 609 87 9ms 4 Jan 2026 761st Irratix 🇳🇱 608 114 411ms 23 May 2022 762nd laikoni 606 110 119ms 3 Mar 2019 763rd Yewzir 🇧🇪 605 70 293ms 26 May 2024 764th janbehrens 🇩🇪 604 60 3ms 28 Nov 2023 765th janbehrens 🇩🇪 604 73 1,264ms 27 Nov 2022 766th Shanethegamer 🇺🇸 604 94 147ms 2 Jul 2021 766th Yewzir 🇧🇪 604 94 145ms 3 Feb 2024 768th MadScience137 603 76 10ms 19 Oct 2022 769th dokutan 603 114 2ms 26 Dec 2025 770th Shanethegamer 🇺🇸 603 124 146ms 13 Dec 2022 770th unfinishedprogram 603 124 163ms 23 Aug 2023 772nd neihousaigaai 602 88 16ms 7 May 2021 772nd WinterWolfSV 602 88 9ms 25 Feb 2026 772nd artemetra 602 88 9ms 25 Feb 2026 775th MeWhenI 🇻🇦 601 64 3ms 15 Feb 2025 776th emgordon154 601 104 4ms 30 Dec 2024 777th Attero 🇸🇪 600 59 100ms 13 Apr 2020 778th postie77 600 104 370ms 26 Jul 2023 779th dokutan 600 200 77ms 6 hours ago 780th CaedenHarper 🇨🇦 598 70 916ms 7 Sep 2025 781st alemelis 596 71 250ms 4 Mar 2024 782nd AgathokakologicalBit 595 89 10ms 27 Jul 2019 782nd stordev 595 89 10ms 26 Feb 2021 782nd ArmaanAS 595 89 11ms 6 Apr 2021 782nd olivermrose 🇺🇸 595 89 11ms 29 Aug 2021 782nd CodyMiner 595 89 10ms 14 Nov 2021 782nd MarcMush 🇫🇷 595 89 9ms 13 Jan 2022 782nd vodker1 595 89 9ms 7 Mar 2022 782nd trist224 🇫🇷 595 89 10ms 15 Sep 2022 782nd TheBlupper 595 89 11ms 24 Oct 2022 782nd Eilonlif 🇮🇱 595 89 10ms 4 Nov 2022 782nd MichalMarsalek 🇨🇿 595 89 10ms 21 Jan 2023 782nd klixel 🇨🇦 595 89 11ms 19 Jan 2025 782nd agreegious 595 89 10ms 16 Mar 2025 795th annaproxy 595 112 119ms 6 Feb 2022 795th Sakisan 🇧🇪 595 112 116ms 12 Apr 2022 795th Shanethegamer 🇺🇸 595 112 111ms 25 Oct 2022 798th Natanaelel 🇸🇪 594 61 4ms 29 Aug 2022 799th frankgraziano 594 93 5ms 14 Feb 2026 800th hrrs01 593 75 32ms 5 Feb 2018 First Prev 721–800 of 2,084 Next Last