The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 5 days. Why not try and solve them ahead of time?
Foo Fizz Buzz Bar 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 469th AstroOrbis 695 95 11ms 14 Apr 2025 469th TJK-S 695 95 11ms 9 Oct 2025 469th countlpaul-dotcom 695 95 11ms 19 Oct 2025 484th descentcare 688 96 11ms 9 Dec 2021 484th ImpressedByRocks 688 96 12ms 29 Jun 2022 484th aglahir1 688 96 52ms 20 Jul 2022 484th syspro86 688 96 11ms 4 Nov 2022 484th 6lr61 688 96 12ms 30 Nov 2022 484th TimSvensson 688 96 46ms 3 Sep 2023 484th ffelixm 688 96 12ms 31 May 2025 484th lelbal 688 96 13ms 4 hours ago 492nd Jonghyun-Yun 680 97 11ms 2 Jan 2022 492nd guilhem-roy 🇫🇷 680 97 11ms 22 Feb 2022 492nd GalileoCap 680 97 11ms 16 Dec 2023 492nd 0skek 680 97 12ms 13 Feb 2024 492nd SURAJMITTAL 680 97 11ms 13 Dec 2024 497th pigeons-west 673 98 12ms 7 Mar 2022 497th Elliott-R-Shaw 673 98 11ms 2 Feb 2023 497th zalazalaza 673 98 11ms 2 Feb 2023 497th ehulinsky 🇺🇸 673 98 11ms 16 May 2023 497th ridingqwerty 🇺🇸 673 98 12ms 29 Nov 2023 497th qwjhvbxi 673 98 12ms 7 Feb 2024 497th dtbao20 🇻🇳 673 98 11ms 30 Sep 2024 497th NotNoper 673 98 11ms 24 Oct 2024 497th Europe2048 673 98 12ms 2 Dec 2024 506th vale075 667 99 12ms 1 May 2022 506th PkmnQ 667 99 48ms 25 Jul 2022 506th Anthony-Williams-06 667 99 13ms 15 Nov 2022 506th TheoKeller1 667 99 11ms 5 Jun 2023 506th jgh713 667 99 10ms 7 Sep 2023 506th KadinSchultz 667 99 11ms 8 Jan 2024 506th jbjd 667 99 11ms 24 Feb 2024 506th pquline 667 99 11ms 5 Mar 2025 506th jiji7879 667 99 11ms 20 Jun 2025 515th Alfiecxn 🇬🇧 660 100 11ms 7 May 2022 515th dcc5480 660 100 12ms 12 Jan 2023 515th taesungh 660 100 11ms 16 Oct 2023 515th tobyLovick 660 100 11ms 17 Nov 2023 515th hhjellup 660 100 11ms 21 Jul 2025 520th rowboat1 653 101 48ms 19 Jun 2022 520th Heathcorp 🇦🇺 653 101 11ms 28 Jul 2022 520th Andre3582 653 101 11ms 31 Oct 2022 520th brimstonetrader 653 101 11ms 18 Dec 2023 520th Bmrl7 653 101 12ms 24 Feb 2024 520th inverseLorentz 🇦🇺 653 101 12ms 11 Mar 2024 520th madeforlosers 653 101 12ms 5 Sep 2024 520th PKFire18 653 101 11ms 25 Jun 2025 528th michelebastione 🇮🇹 647 102 13ms 21 Nov 2021 528th georgehulme 647 102 42ms 26 Jan 2022 528th pedrocoelhosilva 647 102 11ms 4 Nov 2022 528th OwPowell 647 102 11ms 17 Dec 2023 532nd bsoyka 🇺🇸 641 103 11ms 9 Jan 2022 532nd hvdnsz 641 103 11ms 9 May 2022 532nd james-downey 641 103 10ms 10 Jul 2022 532nd Bodo171 641 103 11ms 27 Nov 2022 532nd shersch 641 103 11ms 20 Jan 2023 532nd Lwi-Sandwich 641 103 12ms 20 Jul 2023 532nd feherd 641 103 11ms 16 Nov 2023 539th cubed-guy 635 104 12ms 13 Feb 2022 539th argusdusty 🇺🇸 635 104 48ms 21 Aug 2022 539th n0Oo0Oo0b 635 104 13ms 29 Dec 2022 539th Razzula 635 104 12ms 4 Oct 2023 539th logvp 635 104 13ms 15 Jan 2024 544th jiaminglimjm 🇲🇾 629 105 12ms 25 Mar 2023 544th dlutolf 629 105 11ms 30 Apr 2023 544th SodiumFluoride 629 105 12ms 14 Sep 2024 544th staniec 629 105 59ms 5 Dec 2024 548th mdnestor 623 106 12ms 23 Dec 2022 548th redhann 623 106 11ms 1 Apr 2023 548th Peanut-XIV 623 106 11ms 9 Apr 2023 548th mbittner20 623 106 11ms 27 May 2023 548th AbhilashaTandon 623 106 12ms 21 Sep 2023 548th levavft 623 106 12ms 26 Oct 2023 548th julian-hoelz 623 106 10ms 19 Sep 2024 548th damoose717 623 106 11ms 23 May 2025 556th Higashida-Daisuke 617 107 11ms 19 Dec 2021 556th pol-7 617 107 12ms 6 Mar 2025 556th tknight-dev 617 107 12ms 30 Jul 2025 556th kellantech 617 107 93ms 18 Dec 2025 556th zgialor-lab 617 107 12ms 16 days ago First Prev 481–560 of 879 Next Last
