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?
Ordinal 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 161st Haksell 🇦🇶 691 94 12ms 2 Dec 2019 161st PFedak 691 94 13ms 17 Apr 2020 161st jacklynnepenick 691 94 12ms 26 Aug 2021 161st georgehulme 691 94 12ms 7 Oct 2022 161st cingulataluke 691 94 13ms 30 Aug 2023 161st dirckvdende 691 94 13ms 13 Jul 2025 167th alangodfrey 684 95 12ms 13 Sep 2019 167th tomtheisen 🇺🇸 684 95 12ms 3 Dec 2019 167th TheBlupper 684 95 13ms 8 Nov 2022 167th randolchance 684 95 19ms 6 Feb 2023 167th janbehrens 🇩🇪 684 95 11ms 5 Dec 2023 167th EnTerr 684 95 13ms 1 Sep 2024 167th JudeTyrrell 684 95 13ms 5 Oct 2024 167th robin-scragg 684 95 18ms 25 Jun 2025 175th andre-lameirinhas 🇵🇹 677 96 19ms 19 Jan 2020 175th guilhem-roy 🇫🇷 677 96 12ms 24 Feb 2022 175th bob-th 677 96 12ms 14 Feb 2023 175th dranjohn 677 96 13ms 20 Sep 2023 175th snooze92 🇫🇷 677 96 12ms 5 Mar 2025 175th XilianRose 677 96 13ms 5 Mar 2025 181st toombs-caeman 670 97 22ms 8 Mar 2020 181st Fargeol 670 97 12ms 17 Nov 2021 181st vishwathg 670 97 13ms 7 Apr 2023 181st bnic24 670 97 12ms 22 Aug 2024 181st Googolplexo 🇷🇺 670 97 13ms 2 hours ago 186th leon-w 663 98 19ms 12 Jul 2019 186th dzhang314 663 98 12ms 16 Sep 2019 186th 77Tigers 663 98 12ms 11 Mar 2021 186th bbakersmith 663 98 13ms 18 Jul 2021 186th Heathcorp 🇦🇺 663 98 11ms 15 Feb 2022 186th markus-rekdal 663 98 15ms 10 May 2022 186th Bmrl7 663 98 12ms 4 Mar 2024 186th alemelis 663 98 13ms 13 Sep 2024 186th jacekwladzinski 663 98 13ms 7 Oct 2025 186th LostSyntax21 🇬🇧 663 98 13ms 2 Dec 2025 196th abailey2020 🇺🇸 657 99 13ms 12 Dec 2020 196th Indivicivet 657 99 20ms 29 Mar 2021 196th amollberg 🇸🇪 657 99 12ms 26 Jan 2022 196th argusdusty 🇺🇸 657 99 13ms 21 Aug 2022 196th fgrosshans 🇫🇷 657 99 13ms 17 Jul 2024 201st skps2010 650 100 13ms 21 Jul 2019 201st guliyevemil1 🇦🇿 650 100 12ms 16 Apr 2020 201st nullie 650 100 14ms 10 Jun 2022 201st jfallon1997 650 100 14ms 17 Aug 2022 201st StefanHabel 🇨🇦 650 100 13ms 20 Dec 2022 201st thehylian 650 100 12ms 25 Dec 2022 201st ssbhatt4321 650 100 20ms 27 Oct 2023 201st Andriamanitra 🇫🇮 650 100 13ms 20 Jun 2024 209th ian-h-chamberlain 🇺🇸 644 101 12ms 8 Jan 2020 209th LlamaLad7 🇬🇧 644 101 12ms 23 Jan 2021 209th mauro-1 🇮🇹 644 101 12ms 17 Aug 2021 209th za3k 644 101 13ms 12 Oct 2022 213th petar-donchev 637 102 13ms 26 Aug 2019 213th jiaminglimjm 🇲🇾 637 102 13ms 12 Dec 2019 213th Malin001 637 102 12ms 4 Jan 2020 213th adamcbrown 637 102 13ms 22 Aug 2020 213th lukasthaler 637 102 13ms 11 Sep 2020 213th hiddicop 🇸🇪 637 102 11ms 25 Jan 2021 213th mrmena 🇦🇺 637 102 13ms 12 Jun 2021 213th harrymwilkins 🇬🇧 637 102 12ms 20 Jul 2021 213th sleepyStick 637 102 13ms 8 Dec 2021 213th Trunksistor 🇫🇷 637 102 13ms 14 Apr 2022 213th jhpaques 🇫🇷 637 102 13ms 2 Aug 2022 213th n0Oo0Oo0b 637 102 19ms 28 Dec 2022 213th yishayv 637 102 13ms 23 Jan 2023 213th fourth-bit 637 102 13ms 11 Jul 2023 213th quimey 637 102 12ms 2 Aug 2023 213th Mabeloid 🇳🇴 637 102 12ms 4 Oct 2024 229th Psirving 631 103 12ms 2 Aug 2020 229th garrisonhh 631 103 13ms 22 Nov 2020 229th AkashTandon167 631 103 12ms 26 Nov 2020 229th NanduBC 631 103 14ms 18 Mar 2021 229th clementblaudeau 631 103 12ms 1 Jun 2021 229th SniperSmiley 🇺🇸 631 103 12ms 23 Jun 2021 229th lemogne 631 103 12ms 10 Aug 2021 229th CedricGebistorf 631 103 13ms 25 Feb 2022 229th knutae 🇳🇴 631 103 14ms 1 Mar 2022 229th petroselo 631 103 12ms 10 Apr 2022 229th b10011 🇫🇮 631 103 13ms 7 Jan 2023 229th DanielPeterssonAI 631 103 13ms 15 Mar 2023 First Prev 161–240 of 473 Next Last
