The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 8 days. Why not try and solve them ahead of time?
Niven Numbers 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 461st b-illy 🇬🇧 951 43 388ms 7 Sep 2024 461st rucin93 🇵🇱 951 43 432ms 26 Sep 2024 461st emgordon154 951 43 423ms 10 Oct 2024 461st fuzzylojik-golf 🇺🇸 951 43 421ms 2 Jul 2025 461st kg583 🇺🇸 951 43 405ms 26 Jul 2025 461st GolfingSuccess 🇬🇷 951 43 466ms 10 Aug 2025 461st Babafaba 951 43 437ms 26 Nov 2025 461st albanian-laundromat 951 43 394ms 11 Feb 2026 461st dokutan 951 43 382ms 24 days ago 461st snoozingnewt 🇨🇦 951 43 379ms 18 days ago 491st JayXon 🇺🇸 951 64 419ms 14 Dec 2025 491st Lydxn 🇨🇦 951 64 448ms 14 Dec 2025 491st fuzzylojik-golf 🇺🇸 951 64 433ms 8 Jan 2026 494th DialFrost 🇸🇬 948 38 2ms 18 Nov 2025 494th Yewzir 🇧🇪 948 38 1ms 18 Nov 2025 494th rucin93 🇵🇱 948 38 1ms 18 Nov 2025 494th edsrzf 🇳🇿 948 38 1ms 18 Nov 2025 494th JayXon 🇺🇸 948 38 2ms 19 Nov 2025 494th sean-niemann 🇺🇸 948 38 1ms 19 Nov 2025 494th GrayJoKing 🇦🇺 948 38 2ms 19 Nov 2025 494th ovs-code 🇩🇪 948 38 1ms 19 Nov 2025 494th Shanethegamer 🇺🇸 948 38 1ms 19 Nov 2025 494th pardouin 🇫🇷 948 38 1ms 19 Nov 2025 494th snoozingnewt 🇨🇦 948 38 2ms 4 Dec 2025 494th fuzzylojik-golf 🇺🇸 948 38 2ms 24 Dec 2025 494th Steffan153 🇫🇮 948 38 1ms 13 Feb 2026 494th dokutan 948 38 1ms 24 days ago 494th albanian-laundromat 948 38 1ms 7 days ago 509th Lydxn 🇨🇦 947 37 76ms 12 Dec 2022 509th ovs-code 🇩🇪 947 37 74ms 29 Jan 2023 509th DialFrost 🇸🇬 947 37 72ms 27 May 2024 509th sean-niemann 🇺🇸 947 37 78ms 12 Jul 2024 509th Steffan153 🇫🇮 947 37 78ms 13 Jul 2024 509th pardouin 🇫🇷 947 37 72ms 22 Aug 2024 515th prplz 🇦🇺 947 61 123ms 13 Jan 2022 515th GrayJoKing 🇦🇺 947 61 124ms 13 Jan 2022 515th JayXon 🇺🇸 947 61 121ms 13 Jan 2022 515th Lydxn 🇨🇦 947 61 123ms 13 Jan 2022 515th primo-ppcg 🇹🇭 947 61 120ms 14 Jan 2022 515th sisyphus-ppcg 🇦🇺 947 61 126ms 17 Jan 2022 515th lynn 947 61 125ms 10 Mar 2022 515th Bubbler-4 947 61 116ms 8 Aug 2022 515th MeWhenI 🇻🇦 947 61 125ms 10 Oct 2022 515th clockworknazo 947 61 116ms 12 Oct 2022 515th andersk 🇺🇸 947 61 115ms 22 Oct 2022 515th Steffan153 🇫🇮 947 61 123ms 17 Nov 2022 515th stefangimmillaro 947 61 126ms 25 Nov 2022 515th sean-niemann 🇺🇸 947 61 128ms 17 Jan 2023 515th DialFrost 🇸🇬 947 61 116ms 18 Jan 2023 515th rucin93 🇵🇱 947 61 121ms 23 Jan 2023 515th Shanethegamer 🇺🇸 947 61 124ms 8 Mar 2023 515th ovs-code 🇩🇪 947 61 125ms 20 Jun 2023 515th Yewzir 🇧🇪 947 61 121ms 23 Sep 2023 515th Betuaredead 947 61 116ms 11 Nov 2023 515th elgan65536 🇺🇸 947 61 123ms 5 Mar 2024 515th pardouin 🇫🇷 947 61 127ms 22 Aug 2024 515th nullie 947 61 134ms 18 Dec 2024 515th acotis 947 61 120ms 26 Jan 2025 515th emgordon154 947 61 127ms 18 Feb 2025 515th fuzzylojik-golf 🇺🇸 947 61 129ms 17 Jun 2025 515th edsrzf 🇳🇿 947 61 131ms 26 Jul 2025 515th qpwoeirut 947 61 121ms 16 Aug 2025 515th kumavale 947 61 133ms 17 Aug 2025 515th albanian-laundromat 947 61 130ms 24 Sep 2025 515th snoozingnewt 🇨🇦 947 61 123ms 4 Dec 2025 515th dokutan 947 61 121ms 24 days ago 515th madex 🇩🇪 947 61 120ms 8 days ago 548th btnlq 946 29 237ms 21 Feb 2021 548th nwellnhof 🇩🇪 946 29 270ms 25 Oct 2021 548th primo-ppcg 🇹🇭 946 29 267ms 10 Mar 2022 548th GrayJoKing 🇦🇺 946 29 259ms 10 Mar 2022 548th SirBogman 🇺🇸 946 29 246ms 23 Jun 2022 548th MeWhenI 🇻🇦 946 29 272ms 28 Jan 2023 548th stefangimmillaro 946 29 266ms 29 Oct 2023 548th Yewzir 🇧🇪 946 29 259ms 19 Nov 2023 548th dcgjb 946 29 259ms 24 Jan 2024 548th DialFrost 🇸🇬 946 29 281ms 6 Jun 2024 548th bitsandbeyond 🇳🇱 946 29 262ms 20 Oct 2025 559th GrayJoKing 🇦🇺 946 35 39ms 8 Sep 2021 559th ovs-code 🇩🇪 946 35 35ms 21 Jun 2022 First Prev 481–560 of 4,246 Next Last