The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 2 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 385th snoozingnewt 🇨🇦 945 41 2ms 11 Dec 2025 385th sean-niemann 🇺🇸 945 41 1ms 23 Dec 2025 385th DialFrost 🇸🇬 945 41 2ms 31 Dec 2025 385th Steffan153 🇫🇮 945 41 2ms 11 Feb 2026 405th xsot 🇸🇬 943 52 2ms 12 Oct 2023 406th JayXon 🇺🇸 942 61 124ms 13 Jan 2022 406th Lydxn 🇨🇦 942 61 126ms 13 Jan 2022 406th primo-ppcg 🇹🇭 942 61 125ms 14 Jan 2022 406th lynn 942 61 124ms 10 Mar 2022 406th ndren 942 61 127ms 27 Sep 2023 406th stefangimmillaro 942 61 122ms 18 Oct 2023 406th pardouin 🇫🇷 942 61 136ms 24 Aug 2024 406th edsrzf 🇳🇿 942 61 125ms 26 Oct 2024 406th acotis 942 61 120ms 10 Jan 2025 406th fuzzylojik-golf 🇺🇸 942 61 136ms 28 Jun 2025 406th kumavale 942 61 119ms 26 Aug 2025 406th sean-niemann 🇺🇸 942 61 141ms 6 Jan 2026 418th Lydxn 🇨🇦 941 70 61ms 2 Jan 2022 418th JayXon 🇺🇸 941 70 57ms 7 Mar 2022 420th primo-ppcg 🇹🇭 937 40 24ms 19 Jul 2022 421st Lydxn 🇨🇦 936 35 376ms 16 Jan 2024 421st Steffan153 🇫🇮 936 35 486ms 16 Jan 2024 421st DialFrost 🇸🇬 936 35 428ms 16 Jan 2024 421st sean-niemann 🇺🇸 936 35 382ms 17 Jan 2024 421st JayXon 🇺🇸 936 35 372ms 18 Jan 2024 421st m-tkach 🇺🇦 936 35 410ms 21 Jan 2024 421st xsot 🇸🇬 936 35 397ms 29 Jan 2024 421st Yewzir 🇧🇪 936 35 459ms 4 Feb 2024 421st pardouin 🇫🇷 936 35 414ms 24 Jun 2024 421st b-illy 🇬🇧 936 35 387ms 7 Sep 2024 421st kg583 🇺🇸 936 35 390ms 16 Oct 2024 421st fuzzylojik-golf 🇺🇸 936 35 414ms 2 Jul 2025 433rd Constructor7 935 42 10ms 22 Feb 2018 433rd kmaork 🇮🇱 935 42 9ms 18 Apr 2018 433rd TFeld00 🇩🇰 935 42 9ms 8 Aug 2019 433rd prplz 🇦🇺 935 42 9ms 27 Nov 2019 433rd andersk 🇺🇸 935 42 10ms 20 Mar 2020 433rd apourchot 935 42 9ms 15 Feb 2021 433rd marcin7Cd 935 42 9ms 6 Mar 2021 433rd rak1507 🇬🇧 935 42 9ms 1 Apr 2021 433rd Indivicivet 935 42 9ms 10 May 2021 433rd nwellnhof 🇩🇪 935 42 28ms 31 Oct 2021 433rd akshatj27 🇦🇶 935 42 10ms 28 Dec 2021 433rd anter69 🇭🇺 935 42 10ms 26 Jan 2022 433rd MichaelMBradley 🇨🇦 935 42 9ms 2 Apr 2022 433rd janbehrens 🇩🇪 935 42 9ms 30 May 2022 433rd 051 🇸🇬 935 42 10ms 8 Aug 2022 433rd vhoulbreque 🇫🇷 935 42 9ms 18 Aug 2022 433rd dzshn 935 42 10ms 24 Aug 2022 433rd OllieBoyne 🇬🇧 935 42 9ms 19 Sep 2022 433rd commandz0 🇺🇸 935 42 9ms 29 Sep 2022 433rd FlorianCassayre 🇫🇷 935 42 9ms 28 Oct 2022 433rd betaveros 935 42 10ms 4 Jan 2023 433rd b10011 🇫🇮 935 42 9ms 13 Jan 2023 433rd SirFireball3521 935 42 10ms 19 Jan 2023 433rd Alex-x90 🇺🇸 935 42 10ms 13 Feb 2023 433rd Bubbler-4 935 42 12ms 23 Feb 2023 433rd scpchicken 🇵🇼 935 42 9ms 16 Mar 2023 433rd Eilonlif 🇮🇱 935 42 10ms 30 Mar 2023 433rd Erik-M-Larsson 935 42 9ms 4 Apr 2023 433rd fourth-bit 935 42 9ms 3 Jul 2023 433rd 2011-Chan-Ethan 935 42 10ms 5 Jul 2023 433rd elgan65536 🇺🇸 935 42 9ms 19 Nov 2023 433rd cros107 🇦🇺 935 42 9ms 24 Nov 2023 433rd Koshu 935 42 10ms 5 Dec 2023 433rd SirBogman 🇺🇸 935 42 9ms 8 Dec 2023 433rd 1231234md5 🇨🇳 935 42 10ms 15 Dec 2023 433rd ridingqwerty 🇺🇸 935 42 9ms 26 Dec 2023 433rd byronknoll 🇺🇸 935 42 9ms 5 Feb 2024 433rd Just4FunCoder 935 42 9ms 17 Feb 2024 433rd RobertHoeh 935 42 9ms 11 Apr 2024 433rd HETHAT 🇩🇿 935 42 9ms 11 Apr 2024 433rd cakular 935 42 10ms 19 May 2024 433rd starfihs 935 42 10ms 4 Jul 2024 433rd zacjl 935 42 10ms 24 Aug 2024 433rd alemelis 935 42 10ms 31 Aug 2024 433rd emgordon154 935 42 10ms 10 Oct 2024 433rd lifthrasiir 🇰🇷 935 42 10ms 8 Nov 2024 433rd jasonxue1 935 42 10ms 8 Aug 2025 433rd luuumine 🇫🇷 935 42 10ms 9 Nov 2025 First Prev 401–480 of 5,508 Next Last