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 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 398th jared-hughes 781 57 35ms 12 Sep 2022 398th GrayJoKing 🇦🇺 781 57 31ms 21 Jan 2023 403rd namelessiw 780 80 379ms 7 Jun 2024 403rd stefangimmillaro 780 80 412ms 20 Oct 2025 405th kg583 🇺🇸 780 87 39ms 16 Feb 2025 406th edre 779 68 10ms 6 May 2018 406th SomeKitten 🇺🇸 779 68 9ms 21 Aug 2022 406th plcc0 779 68 10ms 30 Mar 2025 409th Attero 🇸🇪 778 81 1ms 2 Apr 2020 410th steffan-polygolf 778 94 8ms 21 Feb 2024 411th tayloia 🇬🇧 777 59 9ms 10 May 2023 411th steffan-polygolf 777 59 11ms 21 Feb 2024 413th GrayJoKing 🇦🇺 774 63 454ms 16 Jan 2024 414th ovs-code 🇩🇪 773 92 61ms 3 Jun 2024 415th janbehrens 🇩🇪 773 125 290ms 28 Nov 2023 416th MeWhenI 🇻🇦 772 62 1ms 10 Oct 2023 417th error256 771 91 63ms 19 Jun 2025 418th MarcMush 🇫🇷 770 55 298ms 13 Jan 2022 419th primo-ppcg 🇹🇭 769 39 1,021ms 10 Feb 2022 419th DialFrost 🇸🇬 769 39 35ms 26 Jan 2023 421st emplv 🇱🇻 769 68 148ms 28 Mar 2025 422nd sisyphus-ppcg 🇦🇺 769 70 2ms 22 Jan 2023 422nd inventshah 769 70 2ms 24 Jan 2023 424th IanUtley 769 77 9ms 26 Apr 2024 425th GrayJoKing 🇦🇺 769 86 40ms 23 Jan 2023 425th 386asm 🇺🇸 769 86 37ms 7 May 2023 427th marcin7Cd 768 69 9ms 27 Dec 2020 427th annaproxy 768 69 10ms 8 Jun 2022 427th jakobkordez 🇸🇮 768 69 10ms 28 Oct 2022 427th OwPowell 768 69 10ms 18 Dec 2023 427th ImpressedByRocks 768 69 10ms 6 Sep 2025 432nd SirBogman 🇺🇸 767 58 33ms 4 Dec 2022 433rd jared-hughes 765 93 439ms 24 Jun 2022 434th jared-hughes 764 60 13ms 7 Mar 2022 434th janbehrens 🇩🇪 764 60 10ms 28 Nov 2023 436th sisyphus-ppcg 🇦🇺 764 90 3ms 6 Feb 2023 436th ovs-code 🇩🇪 764 90 3ms 7 Feb 2023 436th DialFrost 🇸🇬 764 90 3ms 3 Feb 2025 439th edsrzf 🇳🇿 763 104 136ms 4 Dec 2025 440th snoozingnewt 🇨🇦 762 64 386ms 13 Feb 2026 441st tomtheisen 🇺🇸 761 82 365ms 15 Dec 2022 442nd jared-hughes 758 71 2ms 16 Mar 2022 443rd lynn 758 91 430ms 1 Mar 2022 444th RDShah 757 70 10ms 11 Apr 2021 444th Artemis21 🇬🇧 757 70 11ms 21 Jan 2025 444th HumanoidCPU 757 70 10ms 11 Feb 2025 444th albanian-laundromat 757 70 10ms 18 Sep 2025 448th timvermeulen 756 87 115ms 19 Jan 2020 449th DialFrost 🇸🇬 756 105 112ms 4 Dec 2025 450th somebody1234 755 48 3ms 28 Mar 2018 451st cure-honey 🇯🇵 755 80 37ms 9 Jul 2021 452nd Shanethegamer 🇺🇸 754 59 39ms 20 Aug 2021 453rd primo-ppcg 🇹🇭 754 132 1,696ms 9 Jun 2024 454th voytxt 🇨🇿 752 61 10ms 1 Apr 2024 454th neel11235813 752 61 10ms 1 Apr 2024 454th duckyluuk 🇳🇱 752 61 12ms 5 Apr 2024 457th inventshah 752 71 2ms 11 Sep 2022 458th Yewzir 🇧🇪 751 65 432ms 20 Feb 2024 459th janbehrens 🇩🇪 749 95 433ms 29 Nov 2023 459th Herbert00709 🇵🇱 749 95 71ms 15 Nov 2024 461st MeWhenI 🇻🇦 749 129 298ms 27 Aug 2023 462nd thisishowmymindworks 🇳🇴 746 71 9ms 5 Sep 2020 462nd RaBa21 🇭🇺 746 71 10ms 21 Jul 2025 464th MeWhenI 🇻🇦 746 93 513ms 7 Nov 2025 465th janbehrens 🇩🇪 743 84 374ms 28 Nov 2023 466th proton 🇩🇪 742 60 40ms 9 Jun 2020 466th jaredcrystal 🇺🇸 742 60 32ms 14 Dec 2020 468th emgordon154 742 93 477ms 8 Jun 2025 469th SirBogman 🇺🇸 741 44 37ms 5 Oct 2022 470th MeWhenI 🇻🇦 741 72 2ms 17 Nov 2022 471st MeWhenI 🇻🇦 741 96 71ms 17 Nov 2022 471st m-tkach 🇺🇦 741 96 56ms 15 Dec 2022 471st Alex-x90 🇺🇸 741 96 60ms 28 Sep 2023 474th somebody1234 740 62 9ms 28 Mar 2018 474th prplz 🇦🇺 740 62 9ms 1 Dec 2020 476th edsrzf 🇳🇿 740 93 43ms 14 Nov 2025 477th GolfingSuccess 🇬🇷 739 66 435ms 25 Jan 2025 477th CaedenHarper 🇨🇦 739 66 352ms 29 Jul 2025 479th ovs-code 🇩🇪 738 73 1ms 18 Nov 2023 479th janbehrens 🇩🇪 738 73 2ms 29 Nov 2023 First Prev 401–480 of 2,083 Next Last