The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. Why not try and solve them ahead of time?
Leap Years in all languages 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 318th sean-niemann 🇺🇸 932 52 112ms 17 Feb 2023 318th DialFrost 🇸🇬 932 52 134ms 8 Nov 2023 318th dokutan 932 52 122ms 25 Sep 2024 318th edsrzf 🇳🇿 932 52 112ms 21 Dec 2025 318th fuzzylojik-golf 🇺🇸 932 52 122ms 16 hours ago 326th JayXon 🇺🇸 931 44 2,652ms 27 Oct 2024 326th Steffan153 🇫🇮 931 44 2,585ms 5 days ago 328th DialFrost 🇸🇬 929 39 1,020ms 29 Aug 2025 328th sean-niemann 🇺🇸 929 39 757ms 12 Sep 2025 328th edsrzf 🇳🇿 929 39 1,528ms 14 Dec 2025 328th Steffan153 🇫🇮 929 39 730ms 14 Feb 2026 328th dokutan 929 39 701ms 21 Feb 2026 333rd primo-ppcg 🇹🇭 929 48 36ms 13 Jun 2022 333rd Lydxn 🇨🇦 929 48 36ms 13 Jun 2022 333rd JayXon 🇺🇸 929 48 35ms 9 Sep 2022 336th fuzzylojik-golf 🇺🇸 928 40 442ms 10 Jul 2025 336th pardouin 🇫🇷 928 40 382ms 5 days ago 338th kg583 🇺🇸 928 58 5ms 21 Aug 2025 339th sean-niemann 🇺🇸 928 65 422ms 24 Sep 2025 340th primo-ppcg 🇹🇭 926 44 483ms 2 May 2020 340th lynn 926 44 470ms 10 Sep 2021 340th Steffan153 🇫🇮 926 44 101ms 5 days ago 340th JayXon 🇺🇸 926 44 1,055ms 10 hours ago 344th Lydxn 🇨🇦 926 52 3ms 30 Sep 2022 345th lynn 926 59 367ms 21 Nov 2021 345th primo-ppcg 🇹🇭 926 59 370ms 21 Nov 2021 345th stefangimmillaro 926 59 358ms 4 Aug 2023 345th sean-niemann 🇺🇸 926 59 426ms 3 Aug 2024 349th MeWhenI 🇻🇦 924 41 5ms 11 Jun 2021 350th pardouin 🇫🇷 924 50 4ms 25 Apr 2025 350th Steffan153 🇫🇮 924 50 4ms 5 days ago 352nd Steffan153 🇫🇮 924 53 7ms 16 Feb 2026 352nd kg583 🇺🇸 924 53 7ms 17 days ago 354th GrayJoKing 🇦🇺 924 54 9ms 21 Nov 2021 354th Lydxn 🇨🇦 924 54 10ms 21 Nov 2021 354th JayXon 🇺🇸 924 54 10ms 15 Feb 2022 354th annaproxy 924 54 10ms 13 Jan 2023 354th IanUtley 924 54 10ms 19 Jun 2024 354th sean-niemann 🇺🇸 924 54 9ms 6 Jun 2025 360th Lydxn 🇨🇦 924 67 25ms 16 Apr 2022 360th JayXon 🇺🇸 924 67 26ms 16 Feb 2026 362nd m-tkach 🇺🇦 923 71 2ms 14 Jun 2025 363rd janbehrens 🇩🇪 923 77 58ms 8 Jan 2022 363rd solmyr2000 923 77 58ms 21 Jun 2022 363rd annaproxy 923 77 60ms 7 Jan 2023 363rd Alex-x90 🇺🇸 923 77 61ms 19 Feb 2023 363rd roupiq 🇵🇱 923 77 59ms 17 Nov 2023 363rd ovs-code 🇩🇪 923 77 55ms 3 Jun 2024 363rd tailorspy 923 77 60ms 23 Sep 2024 363rd luuumine 🇫🇷 923 77 69ms 16 Nov 2025 371st inventshah 922 37 74ms 12 Dec 2022 371st DialFrost 🇸🇬 922 37 70ms 22 Oct 2023 373rd xsot 🇸🇬 921 46 16ms 25 Nov 2019 373rd primo-ppcg 🇹🇭 921 46 10ms 27 Nov 2019 373rd dlenski 921 46 17ms 11 Mar 2020 373rd marcin7Cd 921 46 10ms 15 Mar 2020 373rd jmhowl 921 46 17ms 20 Mar 2020 373rd lenabradley 921 46 17ms 20 Mar 2020 373rd loserface69 921 46 16ms 19 May 2020 373rd LlamaLad7 🇬🇧 921 46 17ms 19 May 2020 373rd hallvabo 🇳🇴 921 46 16ms 7 Nov 2020 373rd nwellnhof 🇩🇪 921 46 16ms 1 Jan 2021 373rd HETHAT 🇩🇿 921 46 16ms 2 Mar 2021 373rd lynn 921 46 17ms 26 Mar 2021 373rd GrayJoKing 🇦🇺 921 46 9ms 3 Apr 2021 373rd kops-cg 921 46 10ms 6 Apr 2021 373rd m-tkach 🇺🇦 921 46 16ms 5 Jun 2021 373rd orthoplex 🇨🇽 921 46 9ms 13 Jan 2022 373rd jared-hughes 921 46 12ms 10 Mar 2022 373rd bricknellj 921 46 17ms 2 Jun 2022 373rd MeWhenI 🇻🇦 921 46 10ms 10 Oct 2022 373rd ovs-code 🇩🇪 921 46 17ms 27 Nov 2022 373rd AlephSquirrel 921 46 10ms 26 Dec 2022 373rd neel11235813 921 46 10ms 3 Jan 2023 373rd b10011 🇫🇮 921 46 9ms 3 Jan 2023 373rd DialFrost 🇸🇬 921 46 10ms 20 Oct 2023 373rd ndren 921 46 16ms 19 Nov 2023 373rd davecame 921 46 17ms 11 Dec 2023 373rd rucin93 🇵🇱 921 46 9ms 19 Jan 2024 373rd Grrisly 921 46 17ms 27 Mar 2024 First Prev 321–400 of 4,856 Next Last