The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 7 days. Why not try and solve them ahead of time?
Prime Numbers 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 631st MichalMarsalek 🇨🇿 913 43 10ms 14 Jan 2023 631st zbreit 🇺🇸 913 43 11ms 28 May 2023 631st heypwesto 🇳🇿 913 43 9ms 31 May 2023 631st kaptsanovb 913 43 9ms 8 Jun 2023 631st kellantech 913 43 10ms 13 Jun 2023 631st Natanaelel 🇸🇪 913 43 9ms 8 Sep 2023 631st FieryIceStickie 913 43 9ms 27 Nov 2023 631st Bulmenisaurus 913 43 17ms 4 Jun 2024 631st ahmetdemirag 🇨🇾 913 43 12ms 9 Jun 2024 631st thatbirdguythatuknownot 913 43 16ms 24 Aug 2024 631st Stockoh 🇫🇷 913 43 12ms 17 Nov 2024 631st snydej 913 43 9ms 21 Nov 2024 631st randolchance 913 43 10ms 19 Oct 2025 631st Garklein 🇨🇦 913 43 10ms 13 days ago 631st madex 🇩🇪 913 43 9ms 8 days ago 656th inventshah 913 47 2ms 9 Sep 2022 656th Lydxn 🇨🇦 913 47 2ms 9 Sep 2022 656th sisyphus-ppcg 🇦🇺 913 47 2ms 10 Sep 2022 656th JayXon 🇺🇸 913 47 2ms 10 Sep 2022 656th GrayJoKing 🇦🇺 913 47 2ms 11 Sep 2022 656th btnlq 913 47 2ms 11 Sep 2022 656th Steffan153 🇫🇮 913 47 2ms 25 Mar 2023 656th m-tkach 🇺🇦 913 47 2ms 31 Jan 2024 656th sean-niemann 🇺🇸 913 47 2ms 1 Jan 2025 656th albanian-laundromat 913 47 2ms 7 Jun 2025 656th fuzzylojik-golf 🇺🇸 913 47 2ms 18 Jul 2025 656th snoozingnewt 🇨🇦 913 47 2ms 13 Dec 2025 656th DialFrost 🇸🇬 913 47 2ms 31 Dec 2025 669th sisyphus-ppcg 🇦🇺 913 66 1ms 7 Jul 2022 669th m-tkach 🇺🇦 913 66 1ms 8 Mar 2023 669th orthoplex 🇨🇽 913 66 1ms 29 Jun 2023 669th UnderKoen 🇳🇱 913 66 2ms 21 May 2025 673rd marshallward 🇺🇸 912 49 39ms 29 Jun 2022 674th Yewzir 🇧🇪 912 63 125ms 17 Feb 2024 675th DialFrost 🇸🇬 911 34 1,068ms 29 Aug 2025 675th edsrzf 🇳🇿 911 34 938ms 4 Sep 2025 675th CaedenHarper 🇨🇦 911 34 1,064ms 7 Sep 2025 675th albanian-laundromat 911 34 944ms 12 Sep 2025 675th sean-niemann 🇺🇸 911 34 925ms 12 Sep 2025 675th fuzzylojik-golf 🇺🇸 911 34 903ms 22 Sep 2025 675th xsot 🇸🇬 911 34 905ms 15 Nov 2025 675th Yewzir 🇧🇪 911 34 814ms 15 Nov 2025 675th pardouin 🇫🇷 911 34 902ms 1 Dec 2025 675th Steffan153 🇫🇮 911 34 693ms 13 Feb 2026 675th GolfingSuccess 🇬🇷 911 34 729ms 17 Feb 2026 675th snoozingnewt 🇨🇦 911 34 745ms 18 days ago 687th MeWhenI 🇻🇦 910 36 405ms 13 Jul 2024 687th CaedenHarper 🇨🇦 910 36 393ms 28 Aug 2025 689th Lydxn 🇨🇦 910 42 3ms 29 Sep 2022 690th Lydxn 🇨🇦 908 45 4ms 2 Jul 2023 691st Lydxn 🇨🇦 908 53 39ms 14 Jun 2022 692nd nwellnhof 🇩🇪 908 54 1ms 9 Aug 2022 692nd sisyphus-ppcg 🇦🇺 908 54 2ms 22 Nov 2022 692nd ovs-code 🇩🇪 908 54 2ms 22 Aug 2023 692nd ListeriaM 908 54 2ms 23 Aug 2023 692nd 09cf 908 54 1ms 13 Oct 2023 692nd Herbert00709 🇵🇱 908 54 2ms 29 Sep 2025 698th JonasHoefer 906 45 112ms 2 Aug 2020 698th Shanethegamer 🇺🇸 906 45 115ms 16 Jul 2021 698th yzhs 🇩🇪 906 45 112ms 26 Jul 2021 698th rak1507 🇬🇧 906 45 114ms 15 Sep 2021 698th arjanadriaanse 🇳🇱 906 45 117ms 27 Nov 2021 698th annaproxy 906 45 140ms 21 Jan 2022 698th Sakisan 🇧🇪 906 45 114ms 21 Jun 2022 698th scpchicken 🇵🇼 906 45 112ms 16 Mar 2023 706th Lydxn 🇨🇦 906 63 484ms 27 Feb 2022 706th JayXon 🇺🇸 906 63 477ms 28 Feb 2022 708th radarek 🇵🇱 904 32 1,275ms 13 Jun 2022 708th stefangimmillaro 904 32 1,305ms 4 Mar 2023 710th Yewzir 🇧🇪 902 51 2ms 18 Nov 2025 710th sean-niemann 🇺🇸 902 51 1ms 18 Nov 2025 710th rucin93 🇵🇱 902 51 2ms 18 Nov 2025 710th JayXon 🇺🇸 902 51 1ms 19 Nov 2025 710th Steffan153 🇫🇮 902 51 1ms 13 Feb 2026 710th DialFrost 🇸🇬 902 51 3ms 16 Feb 2026 716th sisyphus-ppcg 🇦🇺 902 66 1ms 13 May 2022 716th GolfingSuccess 🇬🇷 902 66 1ms 13 May 2022 716th MeWhenI 🇻🇦 902 66 1ms 18 May 2022 716th saito-ta 🇯🇵 902 66 1ms 20 May 2022 716th ovs-code 🇩🇪 902 66 1ms 20 May 2022 First Prev 641–720 of 5,502 Next Last