The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 24 hours. Why not try and solve them ahead of time?
Leap Years in all languages in bytes. 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 Bytes Time Submitted 721st primo-ppcg 🇹🇭 893 36 33ms 8 Dec 2018 721st nwellnhof 🇩🇪 893 36 37ms 28 Apr 2020 721st Waffle3z 893 36 35ms 14 Jul 2021 721st lynn 893 36 36ms 10 Sep 2021 721st sean-niemann 🇺🇸 893 36 35ms 5 Apr 2022 721st jared-hughes 893 36 35ms 9 Sep 2022 721st MeWhenI 🇻🇦 893 36 33ms 10 Oct 2022 721st ovs-code 🇩🇪 893 36 34ms 9 May 2023 721st DialFrost 🇸🇬 893 36 35ms 8 Nov 2023 721st pardouin 🇫🇷 893 36 35ms 21 Aug 2024 721st dokutan 893 36 35ms 25 Sep 2024 721st FlyingPenguin223 893 36 38ms 17 Dec 2024 721st fuzzylojik-golf 🇺🇸 893 36 36ms 25 Aug 2025 734th rambox11 892 44 9ms 20 Dec 2018 734th skps2010 892 44 9ms 4 Jan 2019 734th obarakon 892 44 9ms 9 Jan 2019 734th elisherer 🇮🇱 892 44 10ms 28 Mar 2019 734th goldenice 892 44 9ms 4 Apr 2019 734th user189032 892 44 9ms 29 May 2019 734th marcin7Cd 892 44 9ms 13 Mar 2020 734th ondras 892 44 9ms 3 May 2020 734th daisy-lau 892 44 9ms 20 May 2020 734th efgen 892 44 9ms 12 Jun 2020 734th itsh01 892 44 9ms 15 Jul 2020 734th thisishowmymindworks 🇳🇴 892 44 9ms 20 Jul 2020 734th ToriTheChicken 892 44 9ms 21 Jul 2020 734th ehouais 892 44 8ms 23 Aug 2020 734th Athe81 892 44 9ms 30 Oct 2020 734th jn-lp 🇺🇦 892 44 10ms 1 Nov 2020 734th pandapawskat 892 44 9ms 3 Dec 2020 734th boxjelly 892 44 9ms 14 Feb 2021 734th blader0x 892 44 9ms 28 Mar 2021 734th heypwesto 🇳🇿 892 44 9ms 20 Apr 2021 734th Shanethegamer 🇺🇸 892 44 10ms 22 May 2021 734th Natanaelel 🇸🇪 892 44 9ms 1 Oct 2021 734th alex-oser 🇲🇰 892 44 8ms 5 Oct 2021 734th igmcdowell 892 44 9ms 25 Nov 2021 734th shellbertt 🇨🇦 892 44 10ms 3 Dec 2021 734th ZakkkkAttackkkk 🇵🇭 892 44 8ms 17 Dec 2021 734th fitzdotlol 🇺🇸 892 44 9ms 8 Mar 2022 734th vincens2005 🇺🇸 892 44 8ms 30 Mar 2022 734th otubby 892 44 9ms 30 Mar 2022 734th NathanGabrielson 892 44 9ms 30 Mar 2022 734th inverseLorentz 🇦🇺 892 44 10ms 28 Jun 2022 734th two-bad 🇬🇧 892 44 9ms 5 Jul 2022 734th aksyristos 892 44 9ms 28 Oct 2022 734th scpchicken 🇵🇼 892 44 10ms 22 Feb 2023 734th Kesefon 892 44 9ms 25 Apr 2023 734th dteague3989 892 44 8ms 27 May 2023 734th unfinishedprogram 892 44 9ms 4 Jul 2023 734th Davr1 🇨🇿 892 44 9ms 15 Oct 2023 734th Yewzir 🇧🇪 892 44 10ms 15 Oct 2023 734th dylanarmstrong 892 44 9ms 22 Jan 2024 734th hacker112 🇸🇪 892 44 9ms 22 Jun 2024 734th piano-miles 892 44 9ms 6 Sep 2024 734th kovdmm 892 44 9ms 13 Oct 2024 734th CaedenHarper 🇨🇦 892 44 9ms 22 Oct 2024 734th XenThe 🇬🇧 892 44 9ms 7 Jun 2025 734th olleicua 🇺🇸 892 44 9ms 13 Aug 2025 734th LordSir101 892 44 10ms 18 Aug 2025 734th Elkfoot2 892 44 10ms 10 Jan 2026 734th bac0id 892 44 9ms 27 Jan 2026 734th JOrE20 892 44 10ms 11 Feb 2026 734th FortuiteMan 🇫🇷 892 44 9ms 6 days ago 785th andersk 🇺🇸 892 60 120ms 20 Mar 2020 785th primo-ppcg 🇹🇭 892 60 114ms 2 May 2020 785th JayXon 🇺🇸 892 60 123ms 23 Aug 2021 785th Lydxn 🇨🇦 892 60 114ms 24 Aug 2021 785th lynn 892 60 119ms 10 Sep 2021 785th Super-Pizza 🇨🇦 892 60 130ms 22 May 2023 785th Steffan153 🇫🇮 892 60 126ms 7 days ago 792nd primo-ppcg 🇹🇭 892 131 11ms 2 Aug 2023 792nd frankgraziano 892 131 12ms 30 Jan 2026 794th Lydxn 🇨🇦 891 52 4ms 12 May 2023 794th GrayJoKing 🇦🇺 891 52 3ms 14 Aug 2023 794th dokutan 891 52 4ms 25 Sep 2024 794th kg583 🇺🇸 891 52 4ms 10 Dec 2025 794th edsrzf 🇳🇿 891 52 4ms 14 Dec 2025 799th saito-ta 🇯🇵 890 42 2ms 22 Jun 2023 800th edsrzf 🇳🇿 890 54 6ms 22 Feb 2026 First Prev 721–800 of 4,879 Next Last
