The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 16 hours. Why not try and solve them ahead of time?
Collatz 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 561st lynn 886 65 283ms 5 May 2022 561st GrayJoKing 🇦🇺 886 65 250ms 5 May 2022 561st Sakisan 🇧🇪 886 65 178ms 6 May 2022 561st JayXon 🇺🇸 886 65 301ms 17 Oct 2022 561st Steffan153 🇫🇮 886 65 181ms 12 Nov 2022 561st tobeannouncd 886 65 302ms 25 Apr 2025 561st sean-niemann 🇺🇸 886 65 168ms 9 Jun 2025 568th stefangimmillaro 886 71 100ms 2 Oct 2022 568th Steffan153 🇫🇮 886 71 100ms 23 Feb 2023 568th Shanethegamer 🇺🇸 886 71 98ms 16 May 2023 568th sean-niemann 🇺🇸 886 71 96ms 12 Jul 2024 572nd Shanethegamer 🇺🇸 886 72 145ms 8 May 2025 572nd edsrzf 🇳🇿 886 72 144ms 4 Jul 2025 572nd Yewzir 🇧🇪 886 72 148ms 20 Nov 2025 575th DialFrost 🇸🇬 886 95 29ms 10 Dec 2024 575th snoozingnewt 🇨🇦 886 95 118ms 4 Dec 2025 575th Steffan153 🇫🇮 886 95 120ms 27 Feb 2026 578th canissimia 🇦🇶 886 110 2,640ms 20 Feb 2023 579th GrayJoKing 🇦🇺 885 77 76ms 13 Sep 2024 580th Steffan153 🇫🇮 884 52 7ms 31 Dec 2022 580th blaztoma 🇱🇹 884 52 10ms 18 Jan 2026 582nd frankgraziano 884 75 17ms 23 Feb 2026 583rd albanian-laundromat 884 94 486ms 24 Sep 2025 583rd jkelly467 884 94 401ms 23 Oct 2025 583rd HumanoidCPU 884 94 479ms 8 Nov 2025 586th m-tkach 🇺🇦 883 112 119ms 22 Jun 2025 587th GrayJoKing 🇦🇺 882 70 2ms 6 May 2022 587th ovs-code 🇩🇪 882 70 2ms 8 Oct 2023 587th 09cf 882 70 2ms 8 Oct 2023 587th saito-ta 🇯🇵 882 70 2ms 21 Dec 2023 587th sean-niemann 🇺🇸 882 70 2ms 10 Jul 2024 587th KasperKivimaeki 🇫🇮 882 70 6ms 8 Aug 2025 593rd primo-ppcg 🇹🇭 882 85 39ms 14 Jan 2025 593rd MeWhenI 🇻🇦 882 85 41ms 21 Apr 2025 595th SiestaGuru 882 88 371ms 9 Jan 2023 595th rifatx 882 88 398ms 5 Jul 2024 595th kmathis22 882 88 371ms 25 Sep 2025 598th nipzu 882 94 134ms 17 May 2022 598th Natanaelel 🇸🇪 882 94 126ms 17 Jun 2022 598th nkoppel 882 94 122ms 19 Oct 2022 598th ovs-code 🇩🇪 882 94 126ms 21 Jun 2023 598th mousetail 🇳🇱 882 94 131ms 12 Jan 2024 603rd Irratix 🇳🇱 882 96 62ms 4 May 2022 603rd MeWhenI 🇻🇦 882 96 58ms 1 Jun 2022 603rd janbehrens 🇩🇪 882 96 61ms 21 Apr 2023 603rd Shanethegamer 🇺🇸 882 96 59ms 15 May 2023 603rd Yewzir 🇧🇪 882 96 57ms 11 Nov 2023 603rd MateuszPietrzak 🇵🇱 882 96 60ms 18 Nov 2023 603rd kkoenig 882 96 55ms 21 Dec 2023 603rd BlankSpruce 882 96 61ms 20 Aug 2024 603rd fuzzylojik-golf 🇺🇸 882 96 59ms 14 Jun 2025 603rd dokutan 882 96 60ms 8 Feb 2026 613th primo-ppcg 🇹🇭 881 52 219ms 5 May 2022 613th dvargas46 🇺🇸 881 52 87ms 22 Dec 2022 615th frosster 🇨🇦 881 77 5ms 8 Feb 2026 616th ovs-code 🇩🇪 881 89 458ms 24 Jul 2024 616th jipsong 🇩🇪 881 89 450ms 7 Apr 2025 616th DialFrost 🇸🇬 881 89 485ms 24 Dec 2025 619th sisyphus-ppcg 🇦🇺 880 40 422ms 31 Jan 2023 619th sean-niemann 🇺🇸 880 40 444ms 8 Mar 2025 621st canissimia 🇦🇶 880 50 42ms 5 May 2022 621st ovs-code 🇩🇪 880 50 223ms 7 May 2022 621st sisyphus-ppcg 🇦🇺 880 50 42ms 20 Feb 2023 621st sean-niemann 🇺🇸 880 50 44ms 9 Jun 2025 621st pardouin 🇫🇷 880 50 40ms 22 Aug 2025 626th ovs-code 🇩🇪 880 73 340ms 22 Jul 2023 627th sean-niemann 🇺🇸 880 108 278ms 25 May 2024 627th GolfingSuccess 🇬🇷 880 108 289ms 6 Sep 2025 629th primo-ppcg 🇹🇭 880 193 107ms 14 Aug 2025 630th GrayJoKing 🇦🇺 879 72 433ms 31 May 2022 630th Shanethegamer 🇺🇸 879 72 463ms 1 Jun 2022 630th Steffan153 🇫🇮 879 72 442ms 10 Dec 2022 633rd steffan-polygolf 879 74 132ms 14 Feb 2024 633rd prestosilver 🇺🇸 879 74 123ms 18 Dec 2025 635th emgordon154 877 96 117ms 3 Dec 2025 636th Shanethegamer 🇺🇸 877 142 1,441ms 27 Mar 2025 636th DialFrost 🇸🇬 877 142 1,421ms 28 Mar 2025 636th emgordon154 877 142 1,443ms 10 Apr 2025 636th GolfingSuccess 🇬🇷 877 142 1,431ms 6 Dec 2025 640th JayXon 🇺🇸 877 157 1,772ms 14 Sep 2025 First Prev 561–640 of 3,624 Next Last