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?
Factorial Factorisation 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 881st bac0id 142 912 286ms 25 Jun 2024 882nd Mabeloid 🇳🇴 142 914 292ms 17 Sep 2024 883rd KatieLG-Transpiler 🇬🇧 142 916 336ms 16 Aug 2024 884th KatieLG 🇬🇧 141 752 3ms 22 Aug 2024 885th Languag3 141 920 298ms 21 Oct 2024 886th Stockoh 🇫🇷 141 3,214 2ms 22 Apr 2024 887th kkoenig 140 929 303ms 13 Sep 2024 888th KatieLG 🇬🇧 138 818 213ms 30 Nov 2025 889th dokutan 137 832 12ms 23 Feb 2026 890th MeWhenI 🇻🇦 136 866 3ms 13 Apr 2024 890th Yewzir 🇧🇪 136 866 3ms 13 Apr 2024 890th HumanoidCPU 136 866 3ms 13 Apr 2024 890th BREMAUCY 🇫🇷 136 866 3ms 16 Apr 2024 890th bac0id 136 866 3ms 25 Jun 2024 890th Shanethegamer 🇺🇸 136 866 3ms 6 Dec 2024 890th CaedenHarper 🇨🇦 136 866 3ms 20 Jan 2025 890th dokutan 136 866 3ms 23 Feb 2025 898th zakariamouhid 136 868 3ms 13 Apr 2024 899th KatieLG 🇬🇧 135 871 3ms 13 Apr 2024 899th KatieLG-Transpiler 🇬🇧 135 871 3ms 16 Aug 2024 899th Mabeloid 🇳🇴 135 871 3ms 17 Sep 2024 902nd Vaekor 134 494 9ms 19 Nov 2024 903rd dokutan 134 816 7ms 10 Sep 2025 904th HumanoidCPU 133 867 124ms 13 Apr 2024 904th Yewzir 🇧🇪 133 867 122ms 13 Apr 2024 904th bac0id 133 867 121ms 26 Jun 2024 904th Mabeloid 🇳🇴 133 867 123ms 17 Sep 2024 904th CaedenHarper 🇨🇦 133 867 124ms 22 Jan 2025 909th dokutan 132 757 2ms 2 Aug 2024 910th KatieLG 🇬🇧 131 870 7ms 20 Apr 2025 910th HumanoidCPU 131 870 6ms 26 May 2025 910th CaedenHarper 🇨🇦 131 870 6ms 22 Feb 2026 913th KatieLG 🇬🇧 130 835 465ms 30 Nov 2025 914th Shanethegamer 🇺🇸 130 873 5ms 20 Apr 2025 915th dokutan 129 800 129ms 3 Feb 2025 916th KatieLG 🇬🇧 128 852 10ms 30 Nov 2025 917th HumanoidCPU 128 882 114ms 13 Apr 2024 917th Yewzir 🇧🇪 128 882 109ms 13 Apr 2024 917th RealAMC 🇳🇿 128 882 107ms 24 Apr 2024 917th bac0id 128 882 111ms 26 Jun 2024 917th JGDoerrer 128 882 103ms 17 Jul 2024 917th Mabeloid 🇳🇴 128 882 114ms 17 Sep 2024 917th CaedenHarper 🇨🇦 128 882 115ms 22 Jan 2025 924th KatieLG-Transpiler 🇬🇧 128 886 107ms 16 Aug 2024 925th MarkShcerbakov 127 780 425ms 14 Aug 2024 926th KatieLG 🇬🇧 127 826 107ms 30 Nov 2025 927th HumanoidCPU 127 870 65ms 13 Apr 2024 927th Yewzir 🇧🇪 127 870 65ms 13 Apr 2024 927th bac0id 127 870 63ms 26 Jun 2024 927th Mabeloid 🇳🇴 127 870 68ms 17 Sep 2024 927th The-Wolfson 127 870 70ms 18 Dec 2024 927th CaedenHarper 🇨🇦 127 870 62ms 22 Jan 2025 927th dokutan 127 870 64ms 3 Feb 2025 934th KatieLG 🇬🇧 127 871 68ms 13 Apr 2024 935th madeforlosers 127 3,559 2ms 8 Nov 2024 936th dokutan 126 456 114ms 26 Feb 2025 937th dokutan 126 842 20ms 20 Jul 2025 938th HumanoidCPU 126 870 5ms 4 May 2024 938th bac0id 126 870 5ms 26 Jun 2024 938th KatieLG-Transpiler 🇬🇧 126 870 5ms 16 Aug 2024 938th Mabeloid 🇳🇴 126 870 5ms 17 Sep 2024 938th CaedenHarper 🇨🇦 126 870 5ms 20 Jan 2025 943rd mrmena 🇦🇺 125 821 39ms 16 Apr 2024 944th MeWhenI 🇻🇦 125 873 5ms 13 Apr 2024 945th OfficialCB 125 875 5ms 23 Apr 2024 946th HumanoidCPU 124 456 33ms 10 Jan 2025 947th mrmena 🇦🇺 124 805 3ms 15 Apr 2024 948th dokutan 124 848 6ms 12 Dec 2024 949th Shanethegamer 🇺🇸 124 871 40ms 22 Aug 2024 949th KatieLG 🇬🇧 124 871 41ms 22 Aug 2024 949th HumanoidCPU 124 871 38ms 25 Aug 2024 949th Mabeloid 🇳🇴 124 871 40ms 17 Sep 2024 949th CaedenHarper 🇨🇦 124 871 41ms 22 Jan 2025 949th gigaprofisi 🇺🇸 124 871 41ms 5 Nov 2025 955th KatieLG-Transpiler 🇬🇧 124 888 640ms 16 Aug 2024 956th KatieLG 🇬🇧 124 893 446ms 13 Apr 2024 956th HumanoidCPU 124 893 462ms 27 Jun 2024 958th Yewzir 🇧🇪 124 894 449ms 13 Apr 2024 958th bac0id 124 894 472ms 25 Jun 2024 960th KatieLG 🇬🇧 123 807 1,216ms 30 Nov 2025 First Prev 881–960 of 1,471 Next Last