The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Prime 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 168th frankgraziano 909 44 10ms 1 Feb 2025 168th gigaprofisi 🇺🇸 909 44 9ms 7 Mar 2025 168th andrewjc2000 909 44 9ms 9 Mar 2025 168th souta-1326 909 44 11ms 23 Mar 2025 168th bltnppcnt 909 44 10ms 10 Apr 2025 168th janAkali 🇷🇺 909 44 9ms 8 May 2025 168th RaBa21 🇭🇺 909 44 17ms 10 Jul 2025 168th wuduculfre 909 44 10ms 22 Jul 2025 168th amberzit 909 44 10ms 29 Jul 2025 168th LordSir101 909 44 9ms 11 Aug 2025 168th YAJUE114514 909 44 9ms 15 Aug 2025 168th rschwa6308 🇺🇸 909 44 10ms 24 Aug 2025 168th cpchenpi 909 44 9ms 27 Aug 2025 168th iczelia 🇩🇪 909 44 10ms 19 Oct 2025 168th Adix-null 🇱🇹 909 44 9ms 10 Nov 2025 168th mattyhempstead 909 44 10ms 24 Dec 2025 168th Andrey2001 909 44 10ms 29 Jan 2026 168th nemoyatpeace 909 44 10ms 8 Feb 2026 168th antimon2 🇯🇵 909 44 10ms 10 Feb 2026 168th JOrE20 909 44 10ms 21 Feb 2026 168th edward-Han1024 909 44 10ms 17 days ago 262nd PFischbeck 889 45 15ms 30 Jan 2018 262nd temich-nosov 889 45 9ms 17 Feb 2018 262nd GeoffroyF 889 45 15ms 16 May 2018 262nd daedals 889 45 10ms 24 Apr 2019 262nd markus-rekdal 889 45 10ms 11 Jun 2019 262nd dzhang314 889 45 9ms 13 Aug 2019 262nd cellobix 889 45 16ms 14 Aug 2019 262nd sk- 889 45 9ms 18 Sep 2019 262nd hoodadam 889 45 9ms 23 Sep 2019 262nd jmhowl 889 45 9ms 21 Dec 2019 262nd Iluvatar 889 45 9ms 10 May 2020 262nd chrismilson 889 45 10ms 18 May 2020 262nd GalladeGuy 🇺🇸 889 45 9ms 20 May 2020 262nd thisishowmymindworks 🇳🇴 889 45 11ms 23 Aug 2020 262nd atakan-se 889 45 9ms 27 Sep 2020 262nd jn-lp 🇺🇦 889 45 10ms 29 Oct 2020 262nd huderlem 889 45 9ms 10 Dec 2020 262nd Euan-Hall 889 45 9ms 16 Dec 2020 262nd argusdusty 🇺🇸 889 45 9ms 31 Dec 2020 262nd adityasingh-code 889 45 10ms 2 Jan 2021 262nd jameslindesay 889 45 9ms 24 Feb 2021 262nd vezzick 889 45 9ms 6 Mar 2021 262nd peculiarination 889 45 9ms 28 Apr 2021 262nd og2701 889 45 9ms 14 May 2021 262nd SniperSmiley 🇺🇸 889 45 9ms 22 Jun 2021 262nd gurleen 889 45 9ms 22 Jul 2021 262nd RYNO8 889 45 9ms 7 Aug 2021 262nd ValdeQwerty 889 45 10ms 22 Sep 2021 262nd itsjustfreekie 889 45 9ms 22 Sep 2021 262nd alichraghi 889 45 10ms 15 Oct 2021 262nd Kloppermand 🇩🇰 889 45 12ms 30 Nov 2021 262nd Frowny 889 45 9ms 30 Jan 2022 262nd ademdj19 889 45 10ms 13 Apr 2022 262nd Romain-1 🇫🇷 889 45 9ms 1 Jun 2022 262nd cyxv 889 45 10ms 1 Jul 2022 262nd cyborgdennett 889 45 10ms 2 Aug 2022 262nd jaxmattfair 🇺🇸 889 45 9ms 31 Aug 2022 262nd Bodo171 889 45 10ms 24 Nov 2022 262nd DaCuteRaccoon 889 45 10ms 30 Nov 2022 262nd ItsMeNoobieboy 889 45 15ms 22 Dec 2022 262nd bobbysq 889 45 9ms 4 Jan 2023 262nd Skwerl23 889 45 12ms 5 Feb 2023 262nd NoahBolohan 🇨🇦 889 45 9ms 9 Feb 2023 262nd BREMAUCY 🇫🇷 889 45 9ms 15 Mar 2023 262nd griffinschreiber 889 45 10ms 24 Jun 2023 262nd adriweb 🇫🇷 889 45 10ms 21 Aug 2023 262nd MiranDaniel 🇨🇿 889 45 9ms 31 Aug 2023 262nd LucasChilders 889 45 9ms 14 Sep 2023 262nd Griff95 889 45 9ms 21 Sep 2023 262nd deerawj 889 45 10ms 13 Oct 2023 262nd Vinterion 889 45 9ms 28 Oct 2023 262nd two-bad 🇬🇧 889 45 10ms 26 Nov 2023 262nd mqyhlkahu 889 45 9ms 27 Nov 2023 262nd dylanarmstrong 889 45 10ms 2 Jan 2024 262nd GeorgeStechman 🇬🇧 889 45 10ms 6 Jan 2024 262nd OwPowell 889 45 15ms 7 Jan 2024 262nd Trusly 889 45 10ms 26 Feb 2024 262nd FCORMERAIS 889 45 9ms 4 Mar 2024 262nd trinityy-7 889 45 9ms 6 Mar 2024 First Prev 241–320 of 1,292 Next Last