The Gray Code Decoder and Gray Code Encoder holes will go live in approximately 3 days. 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 560th GrayJoKing 🇦🇺 886 65 250ms 5 May 2022 560th Sakisan 🇧🇪 886 65 178ms 6 May 2022 560th JayXon 🇺🇸 886 65 301ms 17 Oct 2022 560th Steffan153 🇫🇮 886 65 181ms 12 Nov 2022 560th tobeannouncd 886 65 302ms 25 Apr 2025 560th sean-niemann 🇺🇸 886 65 168ms 9 Jun 2025 567th stefangimmillaro 886 71 102ms 2 Oct 2022 567th Steffan153 🇫🇮 886 71 100ms 23 Feb 2023 567th Shanethegamer 🇺🇸 886 71 98ms 16 May 2023 567th sean-niemann 🇺🇸 886 71 106ms 12 Jul 2024 571st Shanethegamer 🇺🇸 886 72 145ms 8 May 2025 571st edsrzf 🇳🇿 886 72 144ms 4 Jul 2025 571st Yewzir 🇧🇪 886 72 148ms 20 Nov 2025 574th DialFrost 🇸🇬 886 95 29ms 10 Dec 2024 574th snoozingnewt 🇨🇦 886 95 118ms 4 Dec 2025 574th Steffan153 🇫🇮 886 95 120ms 27 Feb 2026 577th canissimia 🇦🇶 886 110 2,640ms 20 Feb 2023 578th GrayJoKing 🇦🇺 885 77 76ms 13 Sep 2024 579th Steffan153 🇫🇮 884 52 7ms 31 Dec 2022 579th blaztoma 🇱🇹 884 52 7ms 18 Jan 2026 581st frankgraziano 884 75 17ms 23 Feb 2026 582nd albanian-laundromat 884 94 486ms 24 Sep 2025 582nd jkelly467 884 94 401ms 23 Oct 2025 582nd HumanoidCPU 884 94 479ms 8 Nov 2025 585th m-tkach 🇺🇦 883 112 119ms 22 Jun 2025 586th GrayJoKing 🇦🇺 882 70 2ms 6 May 2022 586th ovs-code 🇩🇪 882 70 2ms 8 Oct 2023 586th 09cf 882 70 2ms 8 Oct 2023 586th saito-ta 🇯🇵 882 70 2ms 21 Dec 2023 586th sean-niemann 🇺🇸 882 70 2ms 10 Jul 2024 586th KasperKivimaeki 🇫🇮 882 70 6ms 8 Aug 2025 592nd primo-ppcg 🇹🇭 882 85 39ms 14 Jan 2025 592nd MeWhenI 🇻🇦 882 85 41ms 21 Apr 2025 594th SiestaGuru 882 88 371ms 9 Jan 2023 594th rifatx 882 88 398ms 5 Jul 2024 594th kmathis22 882 88 371ms 25 Sep 2025 597th nipzu 882 94 144ms 17 May 2022 597th Natanaelel 🇸🇪 882 94 126ms 17 Jun 2022 597th nkoppel 882 94 122ms 19 Oct 2022 597th ovs-code 🇩🇪 882 94 126ms 21 Jun 2023 597th mousetail 🇳🇱 882 94 151ms 12 Jan 2024 602nd Irratix 🇳🇱 882 96 62ms 4 May 2022 602nd MeWhenI 🇻🇦 882 96 58ms 1 Jun 2022 602nd janbehrens 🇩🇪 882 96 61ms 21 Apr 2023 602nd Shanethegamer 🇺🇸 882 96 59ms 15 May 2023 602nd Yewzir 🇧🇪 882 96 57ms 11 Nov 2023 602nd MateuszPietrzak 🇵🇱 882 96 60ms 18 Nov 2023 602nd kkoenig 882 96 55ms 21 Dec 2023 602nd BlankSpruce 882 96 61ms 20 Aug 2024 602nd fuzzylojik-golf 🇺🇸 882 96 63ms 14 Jun 2025 602nd dokutan 882 96 60ms 8 Feb 2026 612th primo-ppcg 🇹🇭 881 52 219ms 5 May 2022 612th dvargas46 🇺🇸 881 52 87ms 22 Dec 2022 614th frosster 🇨🇦 881 77 5ms 8 Feb 2026 615th ovs-code 🇩🇪 881 89 458ms 24 Jul 2024 615th jipsong 🇩🇪 881 89 450ms 7 Apr 2025 615th DialFrost 🇸🇬 881 89 485ms 24 Dec 2025 618th sisyphus-ppcg 🇦🇺 880 40 347ms 31 Jan 2023 618th sean-niemann 🇺🇸 880 40 358ms 8 Mar 2025 620th canissimia 🇦🇶 880 50 42ms 5 May 2022 620th ovs-code 🇩🇪 880 50 223ms 7 May 2022 620th sisyphus-ppcg 🇦🇺 880 50 42ms 20 Feb 2023 620th sean-niemann 🇺🇸 880 50 44ms 9 Jun 2025 620th pardouin 🇫🇷 880 50 40ms 22 Aug 2025 625th ovs-code 🇩🇪 880 73 340ms 22 Jul 2023 626th sean-niemann 🇺🇸 880 108 278ms 25 May 2024 626th GolfingSuccess 🇬🇷 880 108 289ms 6 Sep 2025 628th primo-ppcg 🇹🇭 880 193 107ms 14 Aug 2025 629th GrayJoKing 🇦🇺 879 72 433ms 31 May 2022 629th Shanethegamer 🇺🇸 879 72 463ms 1 Jun 2022 629th Steffan153 🇫🇮 879 72 442ms 10 Dec 2022 632nd steffan-polygolf 879 74 132ms 14 Feb 2024 632nd prestosilver 🇺🇸 879 74 123ms 18 Dec 2025 634th emgordon154 877 96 117ms 3 Dec 2025 635th Shanethegamer 🇺🇸 877 142 1,477ms 27 Mar 2025 635th DialFrost 🇸🇬 877 142 1,432ms 28 Mar 2025 635th emgordon154 877 142 1,445ms 10 Apr 2025 635th GolfingSuccess 🇬🇷 877 142 1,431ms 6 Dec 2025 639th JayXon 🇺🇸 877 157 1,772ms 14 Sep 2025 640th mousetail 🇳🇱 876 40 66ms 29 Aug 2025 First Prev 561–640 of 3,621 Next Last