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?
Niven Numbers (Long) 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 717th Yewzir 🇧🇪 904 63 147ms 10 Apr 2024 722nd Shanethegamer 🇺🇸 904 64 178ms 13 Aug 2022 723rd GrayJoKing 🇦🇺 904 65 1,309ms 14 Aug 2022 723rd primo-ppcg 🇹🇭 904 65 1,265ms 4 Sep 2022 723rd Shanethegamer 🇺🇸 904 65 1,340ms 7 Mar 2023 723rd MeWhenI 🇻🇦 904 65 1,313ms 8 Jun 2023 723rd lynn 904 65 1,231ms 16 Jul 2023 728th GrayJoKing 🇦🇺 904 85 60ms 14 Aug 2022 728th primo-ppcg 🇹🇭 904 85 53ms 7 Dec 2022 728th inventshah 904 85 54ms 26 Jan 2023 728th m-tkach 🇺🇦 904 85 54ms 2 Jun 2023 728th snyderek 🇺🇸 904 85 59ms 24 Nov 2024 733rd GrayJoKing 🇦🇺 903 68 17ms 14 Aug 2022 733rd Lydxn 🇨🇦 903 68 17ms 15 Aug 2022 733rd primo-ppcg 🇹🇭 903 68 17ms 4 Sep 2022 733rd IanUtley 903 68 16ms 12 Nov 2022 733rd Yewzir 🇧🇪 903 68 17ms 10 Apr 2024 738th MeWhenI 🇻🇦 903 69 38ms 21 Feb 2023 739th kg583 🇺🇸 903 86 81ms 19 Dec 2024 740th DialFrost 🇸🇬 900 92 17ms 14 Apr 2025 740th UnderKoen 🇳🇱 900 92 17ms 15 Apr 2025 742nd primo-ppcg 🇹🇭 899 64 40ms 4 Sep 2022 742nd DialFrost 🇸🇬 899 64 10ms 21 Feb 2026 742nd Steffan153 🇫🇮 899 64 10ms 21 Feb 2026 742nd GrayJoKing 🇦🇺 899 64 10ms 25 Feb 2026 746th sisyphus-ppcg 🇦🇺 897 45 1,953ms 2 Nov 2023 747th GrayJoKing 🇦🇺 896 80 27ms 2 Jan 2023 747th MeWhenI 🇻🇦 896 80 28ms 21 Feb 2023 747th m-tkach 🇺🇦 896 80 28ms 2 Jun 2023 747th lynn 896 80 28ms 16 Jul 2023 747th Yewzir 🇧🇪 896 80 27ms 10 Apr 2024 752nd yzhs 🇩🇪 895 41 41ms 21 Jun 2023 752nd adoxography 895 41 42ms 19 Nov 2023 752nd Ralac07 🇦🇺 895 41 40ms 13 Jun 2024 755th JayXon 🇺🇸 895 53 152ms 5 Aug 2024 755th Lydxn 🇨🇦 895 53 167ms 6 Aug 2024 755th emgordon154 895 53 148ms 17 Nov 2024 758th ovs-code 🇩🇪 894 76 4ms 15 Jul 2023 759th pardouin 🇫🇷 894 86 64ms 21 Oct 2024 760th lyphyser 893 45 50ms 14 Nov 2023 760th Steffan153 🇫🇮 893 45 16ms 11 Aug 2024 760th sisyphus-ppcg 🇦🇺 893 45 24ms 12 Aug 2024 760th Shanethegamer 🇺🇸 893 45 16ms 14 Aug 2024 760th DialFrost 🇸🇬 893 45 16ms 17 Aug 2024 765th DialFrost 🇸🇬 893 52 415ms 15 Jan 2024 765th prplz 🇦🇺 893 52 424ms 15 Jan 2024 765th Yewzir 🇧🇪 893 52 453ms 4 Jun 2024 765th lifthrasiir 🇰🇷 893 52 435ms 2 Dec 2024 765th albanian-laundromat 893 52 437ms 25 Aug 2025 770th Maznek 893 54 41ms 22 Jun 2023 771st ovs-code 🇩🇪 893 56 303ms 19 Nov 2025 772nd Waffle3z 893 62 3ms 8 Aug 2022 772nd GrayJoKing 🇦🇺 893 62 3ms 13 Aug 2022 772nd jared-hughes 893 62 3ms 13 Aug 2022 772nd primo-ppcg 🇹🇭 893 62 3ms 4 Sep 2022 772nd sean-niemann 🇺🇸 893 62 3ms 11 Apr 2023 772nd pardouin 🇫🇷 893 62 3ms 21 Oct 2024 772nd fuzzylojik-golf 🇺🇸 893 62 3ms 3 Jul 2025 772nd Steffan153 🇫🇮 893 62 3ms 11 Feb 2026 780th MeWhenI 🇻🇦 893 86 46ms 11 Feb 2025 781st DialFrost 🇸🇬 892 63 108ms 15 Nov 2024 781st sean-niemann 🇺🇸 892 63 133ms 18 Apr 2025 783rd fuzzylojik-golf 🇺🇸 891 53 6ms 10 Sep 2025 783rd targrik 891 53 6ms 27 Nov 2025 783rd KasperKivimaeki 🇫🇮 891 53 24ms 10 Dec 2025 786th GrayJoKing 🇦🇺 891 66 3ms 14 Aug 2022 786th primo-ppcg 🇹🇭 891 66 2ms 4 Sep 2022 786th inventshah 891 66 4ms 26 Jan 2023 786th m-tkach 🇺🇦 891 66 2ms 2 Jun 2023 786th b-illy 🇬🇧 891 66 2ms 15 Dec 2025 791st Yewzir 🇧🇪 890 66 1,317ms 14 days ago 792nd m-tkach 🇺🇦 890 93 16ms 2 Jun 2023 792nd Lydxn 🇨🇦 890 93 18ms 19 Jul 2023 794th SirBogman 🇺🇸 889 41 4,208ms 6 Jan 2024 794th juliansiebert 🇩🇪 889 41 4,157ms 2 Mar 2025 796th SirBogman 🇺🇸 889 55 17ms 8 Aug 2022 796th RDShah 889 55 21ms 9 Aug 2022 796th OllieBoyne 🇬🇧 889 55 17ms 12 Aug 2022 796th TobyBoyne 🇬🇧 889 55 16ms 12 Aug 2022 796th dzshn 889 55 18ms 17 Aug 2022 First Prev 721–800 of 2,560 Next Last