The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 6 days. Why not try and solve them ahead of time?
Niven Numbers in Python 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 298th tomh1012 815 54 10ms 3 Dec 2025 298th FoxInTheClouds 815 54 9ms 8 Feb 2026 323rd lrustand 800 55 10ms 7 May 2018 323rd rishavb123 800 55 10ms 19 Jul 2018 323rd DaleNaci 800 55 10ms 19 Jul 2018 323rd Sakaala 800 55 12ms 23 Apr 2019 323rd szerlak 800 55 12ms 12 Aug 2019 323rd dzhang314 800 55 13ms 13 Aug 2019 323rd ay2718 800 55 9ms 20 Aug 2019 323rd handisb 800 55 10ms 1 Oct 2019 323rd mogron 800 55 13ms 14 Dec 2019 323rd Reyzartz 800 55 11ms 16 Feb 2020 323rd LlamaLad7 🇬🇧 800 55 11ms 13 Mar 2020 323rd Phanabani 🇺🇸 800 55 10ms 21 Oct 2020 323rd cbondurant 800 55 10ms 5 May 2021 323rd jhunterkohler 800 55 10ms 20 May 2021 323rd richard-oelze 🇩🇪 800 55 10ms 27 May 2021 323rd schachmattmatt 800 55 10ms 18 Aug 2021 323rd RYNO8 800 55 13ms 29 Aug 2021 323rd face0xff 800 55 10ms 3 Nov 2021 323rd amollberg 🇸🇪 800 55 9ms 5 Jan 2022 323rd Bonjour27891 🇻🇳 800 55 12ms 19 Feb 2022 323rd jdw1023 800 55 10ms 29 Apr 2022 323rd Natanaelel 🇸🇪 800 55 10ms 24 Jun 2022 323rd dzshn 800 55 11ms 17 Aug 2022 323rd galloj 🇨🇿 800 55 10ms 18 Aug 2022 323rd jfallon1997 800 55 9ms 6 Sep 2022 323rd suwat513 800 55 10ms 13 Sep 2022 323rd MaxElf999 800 55 10ms 23 Sep 2022 323rd jsthope 800 55 11ms 28 Sep 2022 323rd fredrik-bakke 🇳🇴 800 55 10ms 2 Oct 2022 323rd trist224 🇫🇷 800 55 12ms 18 Oct 2022 323rd fourth-bit 800 55 14ms 6 Dec 2022 323rd SheepIsGoat 800 55 12ms 18 Jan 2023 323rd NoahBolohan 🇨🇦 800 55 10ms 7 Feb 2023 323rd austin-siu 800 55 10ms 12 Feb 2023 323rd shellbertt 🇨🇦 800 55 10ms 26 Feb 2023 323rd CheeseCake628 🇳🇴 800 55 10ms 20 Mar 2023 323rd 4ndyJ 🇬🇧 800 55 10ms 20 Mar 2023 323rd felixcroc 800 55 10ms 1 Apr 2023 323rd BREMAUCY 🇫🇷 800 55 10ms 13 Jul 2023 323rd minhtrancccp 800 55 10ms 2 Sep 2023 323rd StronkCheese 🇺🇸 800 55 10ms 8 Sep 2023 323rd Andriamanitra 🇫🇮 800 55 10ms 15 Jan 2024 323rd RobertHoeh 800 55 12ms 18 Jan 2024 323rd zwxzwxzwx21 800 55 10ms 30 Jan 2024 323rd inverseLorentz 🇦🇺 800 55 9ms 18 Feb 2024 323rd sultan 800 55 12ms 3 Mar 2024 323rd namelessiw 800 55 9ms 5 Mar 2024 323rd fgrosshans 🇫🇷 800 55 10ms 11 Jun 2024 323rd wuzekai518 800 55 10ms 17 Jun 2024 323rd EnTerr 800 55 10ms 25 Aug 2024 323rd logvp 800 55 12ms 7 Oct 2024 323rd charliegaming 800 55 9ms 21 Oct 2024 323rd syyynth 800 55 9ms 13 Dec 2024 323rd Pyroan 800 55 10ms 25 Feb 2025 323rd Dandandooo 800 55 10ms 5 May 2025 323rd nooberitess 800 55 9ms 22 May 2025 323rd Mikey-Beep 🇬🇧 800 55 9ms 25 Jul 2025 323rd netfri25 🇮🇱 800 55 12ms 20 Feb 2026 323rd Aquateraneal 🇺🇸 800 55 10ms 17 days ago 323rd denkyuu1 800 55 10ms 10 days ago 383rd danielwang5 786 56 9ms 3 Jan 2019 383rd SniperSmiley 🇺🇸 786 56 10ms 23 Jun 2021 383rd lovernj 786 56 11ms 9 Feb 2022 383rd hellwue 786 56 10ms 25 Feb 2022 383rd Re-Adventures 🇮🇳 786 56 10ms 16 Mar 2022 383rd ademdj19 786 56 9ms 29 Apr 2022 383rd Anonymousellama21 786 56 12ms 15 Jun 2022 383rd alexjurkiewicz 🇦🇺 786 56 9ms 16 Jul 2022 383rd jhpaques 🇫🇷 786 56 9ms 26 Jul 2022 383rd Kloppermand 🇩🇰 786 56 10ms 29 Sep 2022 383rd n0Oo0Oo0b 786 56 9ms 29 Dec 2022 383rd DanielPeterssonAI 786 56 10ms 17 Mar 2023 383rd m42km 786 56 10ms 21 Oct 2023 383rd mathisfun271 786 56 10ms 24 Dec 2023 383rd gabe-gallegos 786 56 14ms 7 May 2024 383rd stertooy 🇧🇪 786 56 9ms 10 Jun 2024 383rd PyryL 🇫🇮 786 56 9ms 25 Aug 2024 383rd itljan30 786 56 11ms 28 Jan 2025 First Prev 321–400 of 924 Next Last