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 632nd galloj 🇨🇿 913 43 9ms 29 Aug 2022 632nd MichalMarsalek 🇨🇿 913 43 10ms 14 Jan 2023 632nd zbreit 🇺🇸 913 43 11ms 28 May 2023 632nd heypwesto 🇳🇿 913 43 9ms 31 May 2023 632nd kaptsanovb 913 43 9ms 8 Jun 2023 632nd kellantech 913 43 10ms 13 Jun 2023 632nd Natanaelel 🇸🇪 913 43 9ms 8 Sep 2023 632nd FieryIceStickie 913 43 9ms 27 Nov 2023 632nd Bulmenisaurus 913 43 17ms 4 Jun 2024 632nd ahmetdemirag 🇨🇾 913 43 12ms 9 Jun 2024 632nd thatbirdguythatuknownot 913 43 16ms 24 Aug 2024 632nd Stockoh 🇫🇷 913 43 12ms 17 Nov 2024 632nd snydej 913 43 9ms 21 Nov 2024 632nd randolchance 913 43 10ms 19 Oct 2025 632nd Garklein 🇨🇦 913 43 10ms 18 days ago 632nd madex 🇩🇪 913 43 9ms 14 days ago 657th inventshah 913 47 2ms 9 Sep 2022 657th Lydxn 🇨🇦 913 47 2ms 9 Sep 2022 657th sisyphus-ppcg 🇦🇺 913 47 2ms 10 Sep 2022 657th JayXon 🇺🇸 913 47 2ms 10 Sep 2022 657th GrayJoKing 🇦🇺 913 47 2ms 11 Sep 2022 657th btnlq 913 47 2ms 11 Sep 2022 657th Steffan153 🇫🇮 913 47 2ms 25 Mar 2023 657th m-tkach 🇺🇦 913 47 2ms 31 Jan 2024 657th sean-niemann 🇺🇸 913 47 2ms 1 Jan 2025 657th albanian-laundromat 913 47 2ms 7 Jun 2025 657th fuzzylojik-golf 🇺🇸 913 47 2ms 18 Jul 2025 657th snoozingnewt 🇨🇦 913 47 2ms 13 Dec 2025 657th DialFrost 🇸🇬 913 47 2ms 31 Dec 2025 670th sisyphus-ppcg 🇦🇺 913 66 1ms 7 Jul 2022 670th m-tkach 🇺🇦 913 66 1ms 8 Mar 2023 670th orthoplex 🇨🇽 913 66 1ms 29 Jun 2023 670th UnderKoen 🇳🇱 913 66 2ms 21 May 2025 674th marshallward 🇺🇸 912 49 39ms 29 Jun 2022 675th Yewzir 🇧🇪 912 63 121ms 17 Feb 2024 676th DialFrost 🇸🇬 911 34 1,068ms 29 Aug 2025 676th edsrzf 🇳🇿 911 34 938ms 4 Sep 2025 676th CaedenHarper 🇨🇦 911 34 1,064ms 7 Sep 2025 676th albanian-laundromat 911 34 944ms 12 Sep 2025 676th sean-niemann 🇺🇸 911 34 925ms 12 Sep 2025 676th fuzzylojik-golf 🇺🇸 911 34 693ms 22 Sep 2025 676th xsot 🇸🇬 911 34 905ms 15 Nov 2025 676th Yewzir 🇧🇪 911 34 814ms 15 Nov 2025 676th pardouin 🇫🇷 911 34 902ms 1 Dec 2025 676th Steffan153 🇫🇮 911 34 693ms 13 Feb 2026 676th GolfingSuccess 🇬🇷 911 34 729ms 17 Feb 2026 676th snoozingnewt 🇨🇦 911 34 745ms 24 days ago 688th MeWhenI 🇻🇦 910 36 405ms 13 Jul 2024 688th CaedenHarper 🇨🇦 910 36 393ms 28 Aug 2025 690th Lydxn 🇨🇦 910 42 3ms 29 Sep 2022 691st Lydxn 🇨🇦 908 45 4ms 2 Jul 2023 692nd Lydxn 🇨🇦 908 53 39ms 14 Jun 2022 693rd nwellnhof 🇩🇪 908 54 1ms 9 Aug 2022 693rd sisyphus-ppcg 🇦🇺 908 54 2ms 22 Nov 2022 693rd ovs-code 🇩🇪 908 54 2ms 22 Aug 2023 693rd ListeriaM 908 54 2ms 23 Aug 2023 693rd 09cf 908 54 1ms 13 Oct 2023 693rd Herbert00709 🇵🇱 908 54 2ms 29 Sep 2025 699th JonasHoefer 906 45 112ms 2 Aug 2020 699th Shanethegamer 🇺🇸 906 45 115ms 16 Jul 2021 699th yzhs 🇩🇪 906 45 112ms 26 Jul 2021 699th rak1507 🇬🇧 906 45 114ms 15 Sep 2021 699th arjanadriaanse 🇳🇱 906 45 117ms 27 Nov 2021 699th annaproxy 906 45 140ms 21 Jan 2022 699th Sakisan 🇧🇪 906 45 114ms 21 Jun 2022 699th scpchicken 🇵🇼 906 45 112ms 16 Mar 2023 707th Lydxn 🇨🇦 906 63 484ms 27 Feb 2022 707th JayXon 🇺🇸 906 63 477ms 28 Feb 2022 709th radarek 🇵🇱 904 32 1,275ms 13 Jun 2022 709th stefangimmillaro 904 32 1,305ms 4 Mar 2023 711th Yewzir 🇧🇪 902 51 2ms 18 Nov 2025 711th sean-niemann 🇺🇸 902 51 1ms 18 Nov 2025 711th rucin93 🇵🇱 902 51 2ms 18 Nov 2025 711th JayXon 🇺🇸 902 51 1ms 19 Nov 2025 711th Steffan153 🇫🇮 902 51 1ms 13 Feb 2026 711th DialFrost 🇸🇬 902 51 1ms 16 Feb 2026 717th sisyphus-ppcg 🇦🇺 902 66 1ms 13 May 2022 717th GolfingSuccess 🇬🇷 902 66 1ms 13 May 2022 717th MeWhenI 🇻🇦 902 66 1ms 18 May 2022 717th saito-ta 🇯🇵 902 66 1ms 20 May 2022 First Prev 641–720 of 5,508 Next Last