The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 4 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 229th Steffan153 🇫🇮 936 42 62ms 13 Feb 2026 242nd primo-ppcg 🇹🇭 936 50 115ms 1 Apr 2019 242nd jslip 936 50 114ms 2 Apr 2019 242nd SirHaswell 936 50 120ms 13 Jun 2019 242nd Attero 🇸🇪 936 50 116ms 31 Mar 2020 242nd SirBogman 🇺🇸 936 50 122ms 14 Jun 2020 242nd aionescu 936 50 115ms 15 Aug 2020 242nd GrayJoKing 🇦🇺 936 50 116ms 6 Dec 2020 242nd sisyphus-ppcg 🇦🇺 936 50 120ms 20 Mar 2021 242nd Shanethegamer 🇺🇸 936 50 120ms 30 Jun 2021 242nd laikoni 936 50 111ms 27 Aug 2021 242nd Irratix 🇳🇱 936 50 113ms 25 Sep 2021 242nd annaproxy 936 50 124ms 7 Jan 2022 242nd janbehrens 🇩🇪 936 50 112ms 20 Jul 2022 242nd Steffan153 🇫🇮 936 50 120ms 8 Oct 2022 242nd alomiF 936 50 120ms 1 Sep 2023 242nd jared-hughes 936 50 121ms 7 Jul 2024 242nd sean-niemann 🇺🇸 936 50 120ms 7 Jan 2025 242nd DialFrost 🇸🇬 936 50 113ms 14 Feb 2025 242nd iczelia 🇩🇪 936 50 115ms 16 Oct 2025 242nd edsrzf 🇳🇿 936 50 123ms 21 Dec 2025 262nd sean-niemann 🇺🇸 935 41 149ms 3 Aug 2024 262nd JayXon 🇺🇸 935 41 140ms 4 Aug 2024 262nd Lydxn 🇨🇦 935 41 141ms 6 Aug 2024 262nd Steffan153 🇫🇮 935 41 138ms 8 Aug 2024 262nd lukegustafson 🇺🇸 935 41 137ms 11 Oct 2024 267th sean-niemann 🇺🇸 935 76 56ms 2 Jan 2022 267th nwellnhof 🇩🇪 935 76 61ms 3 Jan 2022 267th Irratix 🇳🇱 935 76 53ms 3 Jan 2022 267th primo-ppcg 🇹🇭 935 76 59ms 18 Jan 2022 267th voytxt 🇨🇿 935 76 58ms 10 Apr 2022 267th jared-hughes 935 76 54ms 20 Jul 2022 267th MeWhenI 🇻🇦 935 76 54ms 6 Sep 2022 267th DialFrost 🇸🇬 935 76 58ms 30 Jan 2023 267th Steffan153 🇫🇮 935 76 60ms 7 Feb 2023 267th xsot 🇸🇬 935 76 62ms 21 May 2023 267th GrayJoKing 🇦🇺 935 76 59ms 29 Feb 2024 267th dokutan 935 76 57ms 25 Sep 2024 267th snyderek 🇺🇸 935 76 61ms 3 Oct 2024 267th fuzzylojik-golf 🇺🇸 935 76 62ms 28 Jun 2025 267th Yax42 🇫🇷 935 76 58ms 4 Oct 2025 267th Babafaba 935 76 55ms 15 Oct 2025 267th KasperKivimaeki 🇫🇮 935 76 57ms 15 Oct 2025 267th inventshah 935 76 58ms 25 Oct 2025 267th 09cf 935 76 57ms 25 Nov 2025 286th primo-ppcg 🇹🇭 934 35 243ms 22 Dec 2018 286th HPWiz 🇳🇿 934 35 430ms 17 Nov 2020 286th sean-niemann 🇺🇸 934 35 393ms 30 Sep 2022 286th Steffan153 🇫🇮 934 35 382ms 26 Dec 2022 286th ovs-code 🇩🇪 934 35 376ms 24 Oct 2023 286th DialFrost 🇸🇬 934 35 417ms 8 Nov 2023 292nd HPWiz 🇳🇿 934 56 581ms 24 Nov 2022 292nd KasperKivimaeki 🇫🇮 934 56 574ms 17 Dec 2024 292nd DialFrost 🇸🇬 934 56 564ms 17 Dec 2024 292nd sean-niemann 🇺🇸 934 56 395ms 4 Feb 2026 292nd Steffan153 🇫🇮 934 56 697ms 22 days ago 297th chloeching-amino 933 42 11ms 24 May 2020 297th janlelis 933 42 10ms 10 Feb 2021 297th KatieLG 🇬🇧 933 42 9ms 15 Apr 2021 297th sultan 933 42 10ms 2 May 2021 297th Y0UR-U5ERNAME 933 42 12ms 5 Sep 2021 297th nathanadams 🇳🇿 933 42 10ms 11 Sep 2021 297th sisyphus-ppcg 🇦🇺 933 42 14ms 10 Mar 2022 297th randolchance 933 42 12ms 20 Jan 2023 297th tayloia 🇬🇧 933 42 10ms 17 May 2023 297th Alex-x90 🇺🇸 933 42 9ms 11 Jul 2023 297th targrik 933 42 10ms 12 Feb 2025 297th luuumine 🇫🇷 933 42 10ms 29 Oct 2025 297th Lv0Sys 🇵🇱 933 42 10ms 2 Dec 2025 310th sean-niemann 🇺🇸 933 47 2ms 9 Sep 2022 310th Lydxn 🇨🇦 933 47 2ms 9 Sep 2022 310th JayXon 🇺🇸 933 47 2ms 10 Sep 2022 310th GrayJoKing 🇦🇺 933 47 2ms 10 Sep 2022 310th MeWhenI 🇻🇦 933 47 2ms 10 Oct 2022 310th Steffan153 🇫🇮 933 47 2ms 9 Feb 2023 310th DialFrost 🇸🇬 933 47 2ms 8 Nov 2023 310th dokutan 933 47 2ms 25 Sep 2024 318th JayXon 🇺🇸 931 44 2,652ms 27 Oct 2024 318th Steffan153 🇫🇮 931 44 2,585ms 4 days ago 320th Lydxn 🇨🇦 931 52 116ms 14 Oct 2022 First Prev 241–320 of 4,845 Next Last